Modafinil: Difference between revisions

Modafinil
	(R)-(−)-modafinil (armodafinil; top); (S)-(+)-modafinil (bottom)
Clinical data
Trade names	Provigil, Alertec, Modavigil, others
Other names	CRL-40476; Diphenylmethylsulfinylacetamide
AHFS/Drugs.com	Monograph
MedlinePlus	a602016
License data	US FDA: Modafinil;
Pregnancy; category	AU: B3; ;
Dependence; liability	Psychological: Very low; Physical: Negligible
Addiction; liability	Very low to low
Routes of; administration	Oral (tablets)
ATC code	N06BA07 (WHO) ;
Legal status
Legal status	AU: S4 (Prescription only); UK: POM (Prescription only); US: WARNINGSchedule IV;
Pharmacokinetic data
Bioavailability	Not determined due to the aqueous insolubility
Protein binding	62%
Metabolism	Hepatic (primarily via amide hydrolysis; CYP1A2, CYP2B6, CYP2C9, CYP2C19, CYP3A4, CYP3A5 involved
Elimination half-life	15 hours (R-enantiomer),; 4 hours (S-enantiomer)
Excretion	Urine (80%)
Identifiers
	IUPAC name 2-[(diphenylmethyl)sulfinul]acetamide;
CAS Number	68693-11-8 ;
PubChem CID	4236;
IUPHAR/BPS	7555;
DrugBank	DB00745 ;
ChemSpider	4088 ;
UNII	R3UK8X3U3D;
KEGG	D01832 ;
ChEBI	CHEBI:31859 ;
ChEMBL	ChEMBL1373 ;
CompTox Dashboard (EPA)	DTXSID0023329 ;
ECHA InfoCard	100.168.719
Chemical and physical data
Formula	C15H15NO2S
Molar mass	273.35 g/mol g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=S(C(c1ccccc1)c2ccccc2)CC(=O)N;
	InChI InChI=1S/C15H15NO2S/c16-14(17)11-19(18)15(12-7-3-1-4-8-12)13-9-5-2-6-10-13/h1-10,15H,11H2,(H2,16,17) ; Key:YFGHCGITMMYXAQ-UHFFFAOYSA-N ;
	(verify)

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Modafinil, sold under the brand name Provigil among others, is a wakefulness-promoting drug used for treatment of disorders such as narcolepsy, shift work sleep disorder, idiopathic hypersomnia, and excessive daytime sleepiness associated with obstructive sleep apnea.^[7] It has also seen widespread off-label use as a purported cognitive enhancer.^[8] In the United States modafinil is classified as a schedule IV controlled substance and restricted in availability and usage, due to concerns about possible addiction potential. In most other countries it is a prescription drug but not otherwise legally restricted.

Modafinil acts as an atypical, selective, and weak dopamine reuptake inhibitor which indirectly activates the release of orexin neuropeptides and histamine from the lateral hypothalamus and tuberomammillary nucleus, respectively, by unknown mechanisms, all of which contribute to heightened arousal.^[9]^[10]^[11]

Uses

Medical

Modafinil is a eugeroic used for treatment of narcolepsy, shift work sleep disorder, and excessive daytime sleepiness associated with obstructive sleep apnea.^[7]^[12]^[13]^[14]

Because of the risk for development of skin or hypersensitivity reactions and serious adverse psychiatric reactions, the European Medicines Agency has recommended that new patient prescriptions should only be to treat sleepiness associated with narcolepsy.^[15]

Fatigue

Modafinil has also found off-label use with the neurological fatigue reported by some with multiple sclerosis.^[16] In 2000, Cephalon conducted a study to evaluate modafinil as a potential treatment for MS-related fatigue. A group of 72 people with MS of varying degrees of severity tested two different doses of modafinil and an inactive placebo over nine weeks. Fatigue levels were self-evaluated on standardized scales. Participants taking a lower dose of modafinil reported feeling less fatigued and there was a statistically significant difference in fatigue scores for the lower dose versus the placebo. The higher dose of modafinil was not reported to be significantly more effective.^[17]^[18]

Modafinil is also used off-label to treat sedation and fatigue in many conditions, including depression,^[19]^[20] fibromyalgia, chronic fatigue syndrome, myotonic dystrophy,^[21] opioid-induced sleepiness,^[22] spastic cerebral palsy,^[23] and Parkinson's disease.^[24] Modafinil has been shown to improve excessive daytime somnolence and fatigue in primary biliary cirrhosis.^[25]

Occupational use

Armed forces of several countries are known to have expressed interest in modafinil as an alternative to amphetamine—the drug traditionally employed in combat situations or lengthy missions where troops face sleep deprivation. The French government indicated that the Foreign Legion used modafinil during certain covert operations.^{[citation needed]} The United Kingdom's Ministry of Defence commissioned research into modafinil^[26] from QinetiQ and spent £300,000 on one investigation.^[27] In 2011, the Indian Air Force announced that modafinil was included in contingency plans.^[28]

In the United States military, modafinil has been approved for use on certain Air Force missions, and it is being investigated for other uses.^[29] As of November 2012, modafinil is the only drug approved by the Air Force as a "go pill" for fatigue management.^[30] The use of dextroamphetamine is no longer approved.^[30]

The Canadian Medical Association Journal also reports that modafinil is used by astronauts on long-term missions aboard the International Space Station. Modafinil is "available to crew to optimize performance while fatigued" and helps with the disruptions in circadian rhythms and with the reduced quality of sleep astronauts experience.^[31]

Contraindications

Allergy and hypersensitivity are the only contraindications of the drug,^[32] but literature distributed by Cephalon advises that it is important to consult a physician before using it, as problems may arise for people who are sensitive to constituents of the tablets, people with cirrhosis (which may impair the metabolism of the drug), and people with various cardiovascular problems.^{[citation needed]}

Adverse effects

According to documentation distributed by Teva Pharmaceuticals, one-third of participants in clinical trials reported experiencing headaches; 11% reported nausea; other negative side-effects such as nervousness, diarrhea, insomnia, anxiety, dizziness, and gastrointestinal problems were reported by fewer than 10% of participants.^[33]

Rare occurrences have been reported of more serious adverse effects, including severe skin rashes and other symptoms that are probably allergy-related. From the date of initial marketing, December 1998, to January 30, 2007, the US Food and Drug Administration received six cases of severe cutaneous adverse reactions associated with modafinil, including erythema multiforme (EM), Stevens–Johnson syndrome (SJS), toxic epidermal necrolysis (TEN), and DRESS syndrome, involving adult and pediatric patients. The FDA issued a relevant alert. In the same alert, the FDA also noted that angioedema and multi-organ hypersensitivity reactions have also been reported in postmarketing experiences.^[34] In 2007, the FDA ordered Cephalon to modify the Provigil leaflet in bold-face print of several serious and potentially fatal conditions attributed to modafinil use, including TEN, DRESS syndrome, and SJS.

The long term safety and effectiveness of modafinil have not been determined.^[35]

Modafinil may have an adverse effect on hormonal contraceptives for up to a month after discontinuation.^[36]

Addiction and dependence potential

The addiction and dependence liabilities of modafinil are very low.^[1]^[2]^[37] It shares biochemical mechanisms with addictive stimulant drugs, and some studies have reported it to have similar mood-elevating properties, although to a lesser degree.^[37] Monkeys will self-administer modafinil if they have previously been trained to self-administer cocaine.^[37] Although modafinil does not produce reinforcing effects in mice at doses that are equivalent to those used therapeutically in humans, it does do so at higher doses.^[38]^[39] In accordance, although very rare, case reports of modafinil abuse exist.^[40]^[41] As such, modafinil is classified by the United States FDA as a schedule IV controlled substance, a category for drugs with valid medical uses and low but significant addiction potential.^[2]^[42]

Psychological dependence upon modafinil has only been noted in case reports involving daily overdoses on modafinil for an extended period of time.^[1] Reported withdrawal symptoms include anhedonia, lethargy, anxiety, and insomnia.^[1]

Tolerance

Large-scale clinical studies have found no evidence of tolerance with modafinil at therapeutic dosages even with prolonged use (for 40 weeks and as long as three years).^[43]^[44]^[45]

Psychiatric reactions

Modafinil-associated psychiatric reactions have occurred in those with and without a pre-existing psychiatric history.^[46]

Overdose

In mice and rats, the median lethal dose (LD₅₀) of modafinil is approximately or slightly greater than 1250 mg/kg. Oral LD₅₀ values reported for rats range from 1000–3400 mg/kg. Intravenous LD₅₀ for dogs is 300 mg/kg. Clinical trials on humans involving taking up to 1200 mg/day for 7–21 days and known incidents of acute one-time overdoses up to 4500 mg did not appear to cause life-threatening effects, although a number of adverse experiences were observed, including excitation or agitation, insomnia, anxiety, irritability, aggressiveness, confusion, nervousness, tremor, palpitations, sleep disturbances, nausea, and diarrhea.^[7] As of 2004, the FDA is not aware of any fatal overdoses involving modafinil alone (as opposed to multiple drugs including modafinil).^[7]

Interactions

Coadministration with modafinil alongside opioids such as hydrocodone, oxycodone, and fentanyl, as well as various other drugs, may experience a drop in plasma concentrations. The reasoning behind this action is because modafinil is an inducer of the CYP3A4 enzymes. If not monitored closely, reduced efficacy or withdrawal symptoms can occur.^{[medical citation needed]}

Pharmacology

Pharmacodynamics

As of 2017,^[update] the therapeutic mechanism of action of modafinil for narcolepsy and sleep-wake disorders remains unknown.^[9]^[10]^[47]

Dopamine transporter blocker

Research found that modafinil elevates histamine levels in the hypothalamus in animals.^[48] The locus of the monoamine action of modafinil was also the target of studies, with effects identified on dopamine in the striatum and, in particular, nucleus accumbens,^[49]^[50] norepinephrine in the hypothalamus and ventrolateral preoptic nucleus,^[51]^[52] and serotonin in the amygdala and frontal cortex.^[53] Modafinil was screened at a large panel of receptors and transporters in an attempt to elucidate its pharmacology.^[54] Of the sites tested, it was found to significantly affect only the dopamine transporter (DAT), acting as a dopamine reuptake inhibitor (DRI) with an IC₅₀ value of 4 μM.^[54] Subsequently, it was determined that modafinil binds to the same site on the DAT as cocaine, but in a different manner.^[55]^[56] In accordance, modafinil increases locomotor activity and extracellular dopamine concentrations in animals in a manner similar to the selective DRI vanoxerine (GBR-12909),^[57] and also inhibits methamphetamine-induced dopamine release (a common property of DRIs, since DAT transport facilitates methamphetamine's access to its intracellular targets). As such, "modafinil is an exceptionally weak, but apparently very selective, [DAT] inhibitor".^[58] In addition to animal research, a human positron emission tomography (PET) imaging study found that 200 mg and 300 mg doses of modafinil resulted in DAT occupancy of 51.4% and 56.9%, respectively, which was described as "close to that of methylphenidate".^[59] Another human PET imaging study similarly found that modafinil occupied the DAT and also determined that it significantly elevated extracellular levels of dopamine in the brain, including in the nucleus accumbens.^[60]

Modafinil has been described as an "atypical" DAT inhibitor, and shows a profile of effects that is very different from those of other dopaminergic stimulants.^[61]^[62] For instance, modafinil produces wakefulness reportedly without the need for compensatory sleep, and shows a relatively low, if any,^[63] potential for abuse.^[58]^[61]^[62] Aside from modafinil, examples of other atypical DAT inhibitors include vanoxerine and benztropine, which have a relatively low abuse potential similarly to modafinil.^[61] These drugs appear to interact molecularly with the DAT in a distinct way relative to "conventional" DAT blockers such as cocaine and methylphenidate.^[56]^[61]

DAT-independent actions

Against the hypothesis that modafinil exerts its effects by acting as a DRI, tyrosine hydroxylase inhibitors (which deplete dopamine) fail to block the effects of modafinil in animals.^[64] In addition, modafinil fails to reverse reserpine-induced akinesia, whereas dextroamphetamine, a dopamine releasing agent (DRA), is able to do so.^[65] Moreover, one of the first published structure-activity relationship studies of modafinil found in 2012 that DAT inhibition did not correlate with wakefulness-promoting effects in animals among modafinil analogues, and a variety of analogues without any significant inhibition of the DAT still produced wakefulness-promoting effects.^[66] Furthermore, "[the] neurochemical effects [of modafinil] and anatomical pattern of brain area activation differ from typical psychostimulants and are consistent with its beneficial effects on cognitive performance processes such as attention, learning, and memory",^[63] and a study found that modafinil-induced increased locomotor activity in animals was dependent on histamine release and could be abolished by depletion of neuronal histamine, whereas those of methylphenidate were not and could not be.^[48] As such, although it is established that modafinil is a clinically significant DRI, its full pharmacology remains unclear and may be more complex than this single property (i.e., may also include DAT-independent actions, such as "activation of the orexin system").^[55]^[63]

In any case, there is nonetheless a good deal of evidence to indicate that modafinil is producing at least a portion of its wakefulness-promoting effects by acting as a DRI, or at least via activation of the dopaminergic system. In support of modafinil acting as a dopaminergic agent, its wakefulness-promoting effects are abolished in DAT knockout mice (although it is important to note that DAT knockout mice show D₁ and D₂ receptor and norepinephrine compensatory abnormalities, which might confound this finding), reduced by both D₁ and D₂ receptor antagonists (although conflicting reports exist),^[65] and completely blocked by simultaneous inactivation of both D₁ and D₂ receptors.^[58] In accordance, modafinil shows full stimulus generalization to other DAT inhibitors including cocaine, methylphenidate, and vanoxerine, and discrimination is blocked by administration of both ecopipam (SCH-39166), a D₁ receptor antagonist, and haloperidol, a D₂ receptor antagonist.^[62] Partial substitution was seen with the DRA dextroamphetamine and the D₂ receptor agonist PNU-91356A, as well as with nicotine (which indirectly elevates dopamine levels through activation of nicotinic acetylcholine receptors).^[62]

Modafinil may possess yet an additional mechanism of action. Both modafinil and its metabolite, modafinil sulfone, possess anticonvulsant properties in animals, and modafinil sulfone is nearly as potent as modafinil in producing this effect.^[67] However, modafinil sulfone lacks any wakefulness-promoting effects in animals, indicating that a distinct mechanism may be at play in the anticonvulsant effects of both compounds.^[67]

D₂ receptor partial agonist

The (R)-(−)-enantiomer of modafinil, known as armodafinil, was also subsequently found to act as a D₂^High receptor partial agonist, with a K_i of 16 nM, an intrinsic activity of 48%, and an EC₅₀ of 120 nM, in rat striatal tissue.^[68] The (S)-enantiomer is inactive with respect to the D₂ receptor.^[68] Modafinil has been found to directly inhibit the firing of midbrain dopaminergic neurons in the ventral tegmental area and substantia nigra of rats via activation of D₂ receptors.^[69]

Miscellaneous

Modafinil's efficacy in improving vigor and well-being in sleep deprivation subjects is dependent on catechol-O-methyl transferase (COMT) status.^[70] Research suggests that individuals with the Val/Val genotype experience a great improvement in their cognitive function, while those with the Met/Met allele experience very little improvement.^[70]

Pharmacokinetics

Modafinil induces the cytochrome P450 enzymes CYP1A2, CYP3A4, and CYP2B6, as well as inhibiting CYP2C9 and CYP2C19 in vitro.^[6] It may also induce P-glycoprotein (Pgp), which may affect drugs transported by Pgp, such as digoxin.^{[citation needed]} The bioavailability of modafinil is greater than 80% of the administered dose. In vitro measurements indicate that 60% of modafinil is bound to plasma proteins at clinical concentrations of the drug. This percentage actually changes very little when the concentration is varied.^[71] C_max (peak levels) occurs approximately 2–3 hours after administration. Food slows absorption, but does not affect the total AUC^{[clarification needed]}(AUC – area under the curve – meaning, food may slow absorption, but the total amount of the chemical will be absorbed with or without food). Half-life is generally in the 10–12 hour range, subject to differences in CYP genotypes, liver function and renal function. It is metabolized in the liver, and its inactive metabolite is excreted in the urine. Urinary excretion of the unchanged drug ranges from 0% to as high as 18.7%, depending on various factors.^[71]

The two major circulating metabolites of modafinil are modafinil acid (CRL-40467) and modafinil sulfone (CRL-41056).^[72]^[5] Both of these metabolites have been described as inactive,^[73] and neither appear to contribute to the wakefulness-promoting effects of modafinil.^[72]^[5]^[74] However, modafinil sulfone does appear to possess anticonvulsant effects, and this is a property that it shares with modafinil.^[67]

Chemistry

The (R)-(−)-enantiomer of modafinil^[75]

The S-(+)-enantiomer of modafinil^[75]

Measurement in body fluids

Modafinil and/or its major metabolite, modafinil acid, may be quantified in plasma, serum or urine to monitor dosage in those receiving the drug therapeutically, to confirm a diagnosis of poisoning in hospitalized patients or to assist in the forensic investigation of a vehicular traffic violation. Instrumental techniques involving gas or liquid chromatography are usually employed for these purposes.^[76]^[77] As of 2011, it is not specifically tested for by common drug screens (except for anti-doping screens) and is unlikely to cause false positives for other chemically-unrelated drugs such as substituted amphetamines.^[78]

Reagent testing can be used to screen for the presence of modafinil in samples.

Colors produced by modafinil with various reagents
RC	Marquis Reagent	Liebermann	Froehde
Modafinil	Yellow/Orange > Brown^[79]^[80]	Darkening Orange^[79]	Deep orange/red^[80]

Structural analogs

Modafinil is a highly researched compound, with many derivatives created and studied, some examples and their differences between dopamine, serotonin & norepinephrine affect is given in bundled table form below.

Pharmacology of modafinil's structural analogs

Modafinil analogs and their effects on the central nervous system.^[81]
X₁	X₂	NR₁R₂	Action on CNS

H	H	NHCH₃	Stimulating
H	H	NHCH(CH₃)₂	Stimulating
H	H	NHC(CH₃)₃	Stimulating
H	H	NHCH₂CH₃	Sedative
H	H	Piperidine	Sedative
H	H	Morfoline	Sedative
4-Cl	H	NH₂	Stimulating
4-F	4-F	NH₂	Stimulating
4-F	H	NH₂	Stimulating

Thio- & Sulfinylacetamide Modafinil analogs^[56]
Structure	X (di-benzene substitutions)	Y (CH₂ substitution)	R (N-methyl terminating substitution)	K_i [SE interval] (nM) @ DAT	K_i [SE interval] (nM) @ SERT	K_i [SE interval] (nM) @ NET
Modafinil	H	S=O	H	2600 (2430—2780)	inactive	inactive

	H	S	H	12400 (10800—14300)	14500 (11800—17700)	inactive derived as 285000 (117000—690000)
	3,3′-di-Cl	S	H	275 (257—295)	inactive derived as 808000 (706000—924000)	45400 (39600—52000)
	H	S	CH₃	19300 (17900—20800)	inactive derived as 656000 (302000—1420000)	27200 (25700—28900)
	4,4′-di-Cl	S	CH₃	4130 (3620—4710)	10700 (7310—15700)	9770 (9170—10400)
	4,4′-di-Br	S	CH₃	3010 (2770—3260)	5720 (5320—6150)	11000 (9540—12600)
	H	S	allyl	8370 (6680—10500)	inactive derived as 303000 (267000—344000)	inactive derived as 171000 (88300—332000)
	H	S	n-propyl	20700 (20300—21100)	inactive derived as 419000 (240000—729000)	68000 (53200—86900)
	4,4′-di-F	S	n-propyl	11700 (10300—13200)	44200 (38700—50500)	59700 (51200—69600)
	4,4′-di-Cl	S	n-propyl	1240 (1120—1380)	10100 (8900—11400)	7540 (6830—8330)
	4,4′-di-Br	S	n-propyl	590 (550—632)	8900 (8150—9720)	10600 (9980—11300)
	H	S	cyclopropylmethyl	13600 (11900—15600)	20500 (17500—23900)	inactive
	4,4′-di-F	S	cyclopropylmethyl	6700 (5730—7830)	34000 (28800—40200)	57000 (51500—63000)
	4,4′-di-Br	S	cyclopropylmethyl	975 (852—1110)	7030 (6040—8180)	inactive
	H	S	n-butyl	23600 (20500—27100)	inactive	inactive
	4,4′-di-F	S	n-butyl	6400 (5820—7050)	25500 (23300—28000)	56100 (53900—58500)
	4,4′-di-Br	S	n-butyl	722 (659—792)	7090 (6990—8180)	7580 (7210—7970)
	H	S	3-phenylpropyl	2020 (1990—2050)	inactive	inactive
	4,4′-di-F	S	3-phenylpropyl	442 (385—509)	3500 (2950—4160)	inactive
	4,4′-di-Cl	S	3-phenylpropyl	223 (191—260)	inactive	inactive
	4,4′-di-Br	S	3-phenylpropyl	238 (202—280)	60700 (58400—63200)	35500 (31700—39800)
	H	S	4-phenylbutyl	1150 (1020—1290)	inactive	7960 (7590—8350)
	4,4′-di-Br	S	4-phenylbutyl	405 (348—471)	inactive	inactive
	4,4′-di-CH₃	S=O	H	12700 (12400—13100)	inactive	inactive
	4,4′-di-CF₃	S=O	H	35400 (34100—36700)	not tested	not tested
	3,3′-di-F	S=O	H	5930 (4990—7060)	inactive	inactive
	3,3′-di-Cl	S=O	H	881 (763—1020)	inactive	inactive
	H, 3-Br	S=O	H	550 (542—557)	inactive	inactive
	H	S=O	CH₃	13100 (12600—13700)	inactive	inactive
	4,4′-di-Br	S=O	3-phenylpropyl	1280 (1160—1400)	892 (787—1010)	inactive
	4,4′-di-Cl	S	H	2200 (2060—2390)	38800 (36400—41300)	51400 (46000—57500)

History

Modafinil was originally developed in France by neurophysiologist and emeritus experimental medicine professor Michel Jouvet and Lafon Laboratories. Modafinil originated with the late 1970s invention of a series of benzhydryl sulfinyl compounds, including adrafinil, which was first offered as an experimental treatment for narcolepsy in France in 1986. Modafinil is the primary metabolite of adrafinil, lacking the polar -OH group on its terminal amide,^[82] and has similar activity to the parent drug but is much more widely used. It has been prescribed in France since 1994 under the name Modiodal, and in the US since 1998 as Provigil.

In 1998, modafinil was approved by the U.S. Food and Drug Administration^[83] for the treatment of narcolepsy and in 2003 for shift work sleep disorder and obstructive sleep apnea/hypopnea^[84] even though caffeine and amphetamine were shown to be more wakefulness promoting on the Stanford Sleepiness Test Score than modafinil.^[10]

It was approved for use in the UK in December 2002. Modafinil is marketed in the US by Cephalon Inc., who originally leased the rights from Lafon, but eventually purchased the company in 2001.

Cephalon began to market the R-enantiomer armodafinil of modafinil in the U.S. in 2007. After protracted patent litigation and negotiations (see below), generic versions of modafinil became available in the U.S. in 2012.

Patent protection and antitrust litigation

U.S. patent 4,927,855 was issued to Laboratoire L. Lafon on May 22, 1990, covering the chemical compound modafinil. After receiving an interim term extension of 1066 days and pediatric exclusivity of six months, it expired on October 22, 2010. On October 6, 1994, Cephalon filed an additional patent, covering modafinil in the form of particles of defined size. That patent, U.S. patent 5,618,845 was issued on April 8, 1997, but was reissued in 2002 as RE 37,516, which surrendered the 5618845 patent. With pediatric exclusivity, this patent expired on April 6, 2015.^[85]^[86]

On December 24, 2002, anticipating the expiration of exclusive marketing rights, generic drug manufacturers Mylan, Teva, Barr, and Ranbaxy applied to the FDA to market a generic form of modafinil.^[87] At least one withdrew its application after early opposition by Cephalon based on the '516 patent. There is some question whether a particle size patent is sufficient protection against the manufacture of generics. Pertinent questions include whether modafinil may be modified or manufactured to avoid the granularities specified in the new Cephalon patent, and whether patenting particle size is invalid because particles of appropriate sizes are likely to be obvious to practitioners skilled in the art. However, under United States patent law, a patent is entitled to a legal presumption of validity, meaning that in order to invalidate the patent, much more than "pertinent questions" are required.

As of October 31, 2011, U.S. Reissue Patent No. RE 37,516 has been declared invalid and unenforceable.^[88] The District Court for the Eastern District of Pennsylvania ruled that RE 37,516 was invalid because it: (1) was on sale more than one year prior to the date of the application in violation of 35 U.S.C. section 102(b); (2) was actually invented by someone else (the French company Laboratoire L. Lafon); (3) was obvious at the time the invention was made to a person having ordinary skill in the art under 35 U.S.C. section 103(a); and (4) failed the written description requirement of 35 U.S.C. section 112.^[89] The patent was also found to be unenforceable due to Cephalon's inequitable conduct during patent prosecution.^[89]

Cephalon made an agreement with four major generics manufacturers Teva, Barr Pharmaceuticals, Ranbaxy Laboratories, and Watson Pharmaceuticals between 2005 and 2006 to delay sales of generic modafinil in the US until April 2012 by these companies in exchange for upfront and royalty payments.^[90] Litigation arising from these agreements is still pending including an FTC suit filed in April 2008.^[91] Apotex received regulatory approval in Canada despite a suit from Cephalon's marketing partner in Canada, Shire Pharmaceuticals.^[92]^[93] Cephalon has sued Apotex in the US to prevent it from releasing a genericized armodafinil (Nuvigil).^[94] Cephalon's 2011 attempt to merge with Teva was approved by the FTC under a number of conditions, including granting generic US rights to another company;^[95] ultimately, Par Pharmaceutical acquired the US modafinil rights as well as some others.^[96]

In the United Kingdom, Mylan Inc. received regulatory approval to sell generic modafinil produced by Orchid in January 2010; Cephalon sued to prevent sale, but lost the patent trial in November.^[97]

Society and culture

Legal status

United States

Modafinil is currently^[update] classified as a Schedule IV controlled substance under United States federal law; it is illegal to import by anyone other than a DEA-registered importer without a prescription.^[98] However, one may legally bring modafinil into the United States in person from a foreign country, provided that he or she has a prescription for it, and the drug is properly declared at the border crossing. U.S. residents are limited to 50 dosage units (e.g., pills).^[99] Under the US Pure Food and Drug Act, drug companies are not allowed to market their drugs for off-label uses (conditions other than those officially approved by the FDA);^[100] Cephalon was reprimanded in 2002 by the FDA because its promotional materials were found to be "false, lacking in fair balance, or otherwise misleading".^[101] Cephalon pleaded guilty to a criminal violation and paid several fines, including $50 million and $425 million fines to the U.S. government in 2008.^[102]^[103]

China

In mainland China, modafinil is strictly controlled like other stimulants, such as amphetamines and methylphenidate, and not approved for medical use.^[104]

Japan

In Japan, modafinil is Schedule I psychotropic drug.^[105]^[106] There have been reported arrests of people who imported modafinil for personal use.^[107]^[108]

Russia

In Russia modafinil is Schedule II controlled substance like cocaine and morphine. Possession of few modafinil pills can lead to 3–10 years imprisonment.^[109]

Other countries

The following countries do not classify modafinil as a controlled substance:

Canada (not listed in the Controlled Drugs and Substances Act, but it is a Schedule F prescription drug,^[110] so it is subject to seizure by Canada Border Services Agency)
In Finland and Sweden modafinil is a prescription drug but not listed as a controlled substance.^[111]^[112]
Mexico (Not listed as a controlled substance, in the National Health Law)^[113]
South Africa Schedule V^[114]
United Kingdom (not listed in Misuse of Drugs Act so possession not illegal, but prescription required) ^[115]

Brand names

Modafinil is sold under a wide variety of brand names worldwide, including Alertec, Alertex, Altasomil, Aspendos, Forcilin, Intensit, Mentix, Modafinil, Modafinilo, Modanil, Modasomil, Modavigil, Modiodal, Modiwake, Movigil, Provigil, Resotyl, Stavigile, Vigia, Vigicer, Vigil, Vigimax, and Zalux.^[116]

Doping agent

Sports

The regulation of modafinil as a doping agent has been controversial in the sporting world, with high-profile cases attracting press coverage since several prominent American athletes have tested positive for the substance. Some athletes who were found to have used modafinil protested that the drug was not on the prohibited list at the time of their offenses. However, the World Anti-Doping Agency (WADA) maintains that it was related to already banned substances. The Agency added modafinil to its list of prohibited substances on August 3, 2004, ten days before the start of the 2004 Summer Olympics.

Modafinil has received some publicity in the past when several athletes (such as sprinter Kelli White in 2004, cyclist David Clinger^[117] and basketball player Diana Taurasi^[118] in 2010, and rower Timothy Grant in 2015^[119]) were discovered allegedly using it as a performance-enhancing doping agent. (Taurasi and another player, Monique Coker, tested at the same lab, were later cleared.^[120]) It is not clear how widespread this practice is. The BALCO scandal brought to light an as-yet unsubstantiated (but widely published) account of Major League Baseball's all-time leading home-run hitter Barry Bonds' supplemental chemical regimen that included modafinil in addition to anabolic steroids and human growth hormone.^[121] Modafinil has been shown to prolong exercise time to exhaustion while performing at 85% of VO_2max and also reduces the perception of effort required to maintain this threshold.^[122] Modafinil was added to the World Anti-Doping Agency "Prohibited List" in 2004 as a prohibited stimulant (see Modafinil Legal Status).

Nootropic

Modafinil has been used non-medically as a "smart drug" by students, office workers, soldiers and transhumanists.^[123]^[124]^[125]^[126]^[127] It is often compared to the fictional smart drug NZT-48 depicted in Limitless and sometimes called "the 'Limitless' pill".^[128]^[129]^[130]^[131]

Research

ADHD

Double-blind randomized controlled trials have demonstrated the efficacy and tolerability of modafinil in pediatric ADHD,^[132]^[133] however there are risks of serious side effects such as skin reactions and modafinil is not recommended for use in children.^[134]^: 7 In the United States, it was originally pending marketing as Sparlon for pediatric ADHD, but approval was denied by the FDA due to major concerns over the occurrence of Stevens-Johnson Syndrome in clinical trials.^[135]

Depersonalization disorder

Modafinil used alone has been reported to be effective in a subgroup of individuals with depersonalization disorder;^{[citation needed]} the subgroup of people with depersonalization disorder most likely to respond are those who have attentional impairments, under-arousal, and hypersomnia. However, clinical trials have not been conducted.^[136] Dr. Evan Torch calls a combination of an SSRI and modafinil "the hidden pearl that can really help depersonalization disorder."^[137]

Psychiatric/neurodegenerative disorders

It has been studied for depression,^[138] bipolar depression,^[139]^[140] opiate and cocaine dependence,^[141]^[142] Parkinson's disease,^[143] and disease-related fatigue,^[144]^[145] as well as fatigue that is the side effect of other medication.^[146]

Modafinil may also be an effective and well-tolerated treatment in patients with seasonal affective disorder.^[147]

A randomized double-blind study of modafinil showed that normal healthy volunteers between the ages of 30–44 showed general improvement in alertness as well as mood. In the three-day study, counterbalanced, randomized, crossover, inpatient trial of modafinil 400 mg was administered as well as a placebo to the control group. The conclusion demonstrated that modafinil may have general mood-elevating effects in particular for the adjunctive use in treatment-resistant depression.^[25]

Schizophrenia

Modafinil and armofadinil have been studied as a complement to antipsychotic medications in the treatment of schizophrenia. They have been consistently shown to have no effect on positive symptoms or cognitive performance.^[148]^[149]^[150] A 2015 meta-analysis found that modafinil and armofadinil reduce negative symptoms in acutely ill patients, though not stable patients with high negative symptom scores.^[149] Among medications demonstrated to be effective for reducing negative symptoms in combination with anti-psychotics, modafinil and armodafinil are among the smallest effect sizes.^[151] One study found that Armodafinil improved anhedonia–asociality, but not other negative symptom domains.^[150] Modafinil has also been shown to bring significant improvement in subjective measures of schizophrenia condition such as the Psychological General Well-Being Schedule and the Nurses Observation Scale for Inpatient Evaluation.^[152]

Modafinil and armodafinil are considered reasonably safe and well tolerated for schizophrenia patients.^[149] However, researchers caution of potential drug interactions with atypical antipsychotic medications, since most atypical antipsychotics are metabolized by enzymes that modafinil or armodafinil induce. These drug interactions may take months to have evident results, obscuring the interaction.^[153]

Cocaine addiction

Modafinil is under investigation as a possible method to treat cocaine dependence, for several reasons involving biochemical mechanisms of the two drugs, as well as the observation that clinical effects of modafinil are largely opposite to symptoms of cocaine withdrawal.

The pilot 8-week double-blind study of modafinil for cocaine dependence (2004) produced inconclusive results. The number of cocaine-positive urine samples was significantly lower in the modafinil group as compared to the placebo group in the middle of the trial, but by the end of the 8 weeks the difference stopped being significant. Even before the treatment began, the modafinil group had lower cocaine consumption further confounding the results. As compared to placebo, modafinil did not reduce cocaine craving or self-reported cocaine use, and the physicians ratings were only insignificantly better.^[142] Dan Umanoff, of the National Association for the Advancement and Advocacy of Addicts, criticized the authors of the study for leaving the negative results out of the discussion part and the abstract of the article.^[154]^[155]

A later double-blind study of modafinil in people seeking treatment for cocaine dependence found no statistically significant effect on the rate of change in percentage of cocaine non-use days, but noted a significant improvement in the maximum number of consecutive non-use days for cocaine and reduced craving.^[156]

Weight loss

Studies on modafinil (even those on healthy weight individuals) indicate that it has an appetite reducing/weight loss effect.^[157]^[158]^[159]^[160]^[161] All studies on modafinil in the Medline database that are for one month or longer which report weight changes find that modafinil users experience weight loss compared to placebo.^[162] In 2008, one small-scale study on individuals performing simulated shift work quantified the effect as an 18% decrease in total caloric intake on 200 mg/day, and a 38% decrease on 400 mg/day.^[163]

However, the prescribing information for Provigil notes that "There were no clinically significant differences in body weight change in patients treated with Provigil compared to placebo-treated patients in the placebo-controlled clinical trials."^[164]

In experimental studies, the appetite reducing effect of modafinil appears to be similar to that of substituted amphetamines, but, unlike substituted amphetamines, the dose of modafinil that is effective at decreasing food intake does not significantly increase heart rate. Also, an article published in the Annals of Clinical Psychiatry, presented the case of a 280-pound patient (BMI=35.52) who lost 40 pounds over the course of a year on modafinil (to 30.44 BMI). After three years, his weight stabilized at a 50-pound weight loss (29.59 BMI). The authors conclude that placebo controlled studies should be conducted on using modafinil as a weight loss agent.^[158] Conversely, a US patent (#6,455,588) on using modafinil as an appetite stimulating agent has been filed by Cephalon in 2000.

Delayed sleep phase syndrome

Modafinil has been studied as a possible treatment for delayed sleep phase syndrome, which causes excessive daytime somnolence when the natural (delayed) diurnal rhythm is replaced by a socially determined earlier or forward shifted sleep schedule.^[165]

Cognitive enhancement

There is disagreement to whether the cognitive effects modafinil showed in healthy non-sleep-deprived people are sufficient to consider it to be a cognitive enhancer.^[166]^[167]^[168]^[169] The researchers agree that modafinil improves some aspects of working memory, such as digit span, digit manipulation and pattern recognition memory, but the results related to spatial memory, executive function and attention are equivocal.^[166]^[167]^[168]^[170] Some positive effects of modafinil may be limited to "lower-performing" individuals.^[170]^[171] One study found that modafinil restored normal levels of learning ability in methamphetamine addicts, but had no effect on non-addicts.^[172] Modafinil reduces the symptoms of attention-deficit hyperactivity disorder^[173] and improves working and episodic memory.^[47]

Researchers from the University of Oxford and Harvard Medical School evaluated all research papers on cognitive enhancement with modafinil from January 1990 to December 2014 and found 24 studies dealing with benefits that include planning, decision making, flexibility, learning, memory and creativity associated with taking modafinil.^[131]^[174]^[175]^[176] The reviewers state that while only limited information is available on the effects of long-term use the drug appeared safe in the short term, with few side effects and no addictive qualities.^[177]

In March 2017 a study by researchers throughout Germany and Sweden led by psychiatrist Klaus Lieb at the University of Mainz found that modafinil improved the chess players' performances by an average of 15 percent.^[178]^[179]^[180]^[181]^[182]

Post-chemotherapy cognitive impairment

Modafinil has been used off-label in trials with people with symptoms of post-chemotherapy cognitive impairment, also known as "chemobrain", but in 2011 it was found to be no better than placebo.^[183] As of 2015 it had been studied for use in multiple sclerosis associated fatigue, but the resulting evidence was weak and inconclusive.^[184]

Motion sickness

Modafinil has been evaluated alone and in combination with scopolamine as an anti-motion sickness medication. It did not help by itself, but appeared to help in combination with scopolamine, acting to reduce symptoms of drowsiness associated with scopolamine.^[185]

References

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External links

[Withdrawal_case_reports-1] Case reports:
• Krishnan R, Chary KV (March 2015). "A rare case modafinil dependence". Journal of Pharmacology & Pharmacotherapeutics. 6 (1): 49–50. doi:10.4103/0976-500X.149149. PMC 4319252. PMID 25709356. He claimed to have symptoms of worsening of lethargy, tremors of hands, anxiety and erratic sleep hours when he skipped modafinil, patient reported a sense of well-being only with the drug and with the above dose [(1200mg/day)]. ... He reported sleep disturbance, increased sense of body warmth, lethargy and low mood during the process of tapering the drug. Low dose of clonazepam was added to reduce the withdrawal symptoms.{{cite journal}}: CS1 maint: unflagged free DOI (link)
• Kate N, Grover S, Ghormode D (2012). "Dependence on supratherapeutic doses of modafinil: a case report". The Primary Care Companion for CNS Disorders. 14 (5). doi:10.4088/PCC.11l01333. PMC 3583757. PMID 23469316.

[Addiction_liability_review-2] Mignot EJ (October 2012). "A practical guide to the therapy of narcolepsy and hypersomnia syndromes". Neurotherapeutics. 9 (4): 739–52. doi:10.1007/s13311-012-0150-9. PMC 3480574. PMID 23065655. Because of the relatively low risk of addiction, modafinil can be more easily prescribed in patients without a clear, biochemically defined central hypersomnia syndrome, and is also easier to stop, if needed. It is also a schedule IV compound.

[FDA-AllBoxedWarnings-3] "FDA-sourced list of all drugs with black box warnings (Use Download Full Results and View Query links.)". nctr-crs.fda.gov. FDA. Retrieved October 22, 2023.

[nuvigil.com-4] Nuvigil Prescribing Information

[RobertsonHellriegel2003-5] Robertson P, Hellriegel ET (2003). "Clinical pharmacokinetic profile of modafinil". Clinical Pharmacokinetics. 42 (2): 123–37. doi:10.2165/00003088-200342020-00002. PMID 12537513.

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@@ Line 357: / Line 357: @@
 ===Psychiatric/neurodegenerative disorders===
-It has been studied for [[major depressive disorder|depression]],<ref>{{cite journal | vauthors = Fava M, Thase ME, DeBattista C, Doghramji K, Arora S, Hughes RJ | title = Modafinil augmentation of selective serotonin reuptake inhibitor therapy in MDD partial responders with persistent fatigue and sleepiness | journal = Annals of Clinical Psychiatry | volume = 19 | issue = 3 | pages = 153–9 | year = 2007 | pmid = 17729016 | doi = 10.1080/10401230701464858 }}</ref> [[bipolar depression]],<ref name="pmid17671288">{{cite journal | vauthors = Frye MA, Grunze H, Suppes T, McElroy SL, Keck PE, Walden J, Leverich GS, Altshuler LL, Nakelsky S, Hwang S, Mintz J, Post RM | title = A placebo-controlled evaluation of adjunctive modafinil in the treatment of bipolar depression | journal = The American Journal of Psychiatry | volume = 164 | issue = 8 | pages = 1242–9 | date = August 2007 | pmid = 17671288 | doi = 10.1176/appi.ajp.2007.06060981 }}</ref><ref name="pmid20673554">{{cite journal | vauthors = Calabrese JR, Ketter TA, Youakim JM, Tiller JM, Yang R, Frye MA | title = Adjunctive armodafinil for major depressive episodes associated with bipolar I disorder: a randomized, multicenter, double-blind, placebo-controlled, proof-of-concept study | journal = The Journal of Clinical Psychiatry | volume = 71 | issue = 10 | pages = 1363–70 | date = October 2010 | pmid = 20673554 | doi = 10.4088/JCP.09m05900gry }}</ref> [[opiate]] and [[cocaine dependence]],<ref name="pmid20631691">{{cite journal | vauthors = Tahsili-Fahadan P, Carr GV, Harris GC, Aston-Jones G | title = Modafinil blocks reinstatement of extinguished opiate-seeking in rats: mediation by a glutamate mechanism | journal = Neuropsychopharmacology | volume = 35 | issue = 11 | pages = 2203–10 | date = October 2010 | pmid = 20631691 | pmc = 2939923 | doi = 10.1038/npp.2010.94 }}</ref><ref name="pmid15525998"/> [[Parkinson's disease]],<ref>{{cite journal | vauthors = van Vliet SA, Vanwersch RA, Jongsma MJ, van der Gugten J, Olivier B, Philippens IH | title = Neuroprotective effects of modafinil in a marmoset Parkinson model: behavioral and neurochemical aspects | journal = Behavioural Pharmacology | volume = 17 | issue = 5–6 | pages = 453–62 | date = September 2006 | pmid = 16940766 | doi = 10.1097/00008877-200609000-00011 | url = http://meta.wkhealth.com/pt/pt-core/template-journal/lwwgateway/media/landingpage.htm?an=00008877-200609000-00011 }}</ref> [[schizophrenia]],<ref>{{cite journal | vauthors = Turner DC, Clark L, Pomarol-Clotet E, McKenna P, Robbins TW, Sahakian BJ | title = Modafinil improves cognition and attentional set shifting in patients with chronic schizophrenia | journal = Neuropsychopharmacology | volume = 29 | issue = 7 | pages = 1363–73 | date = July 2004 | pmid = 15085092 | doi = 10.1038/sj.npp.1300457 }}</ref> and disease-related [[Fatigue (medical)|fatigue]],<ref>{{cite journal | vauthors = Rammohan KW, Rosenberg JH, Lynn DJ, Blumenfeld AM, Pollak CP, Nagaraja HN | title = Efficacy and safety of modafinil (Provigil) for the treatment of fatigue in multiple sclerosis: a two centre phase 2 study | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 72 | issue = 2 | pages = 179–83 | date = February 2002 | pmid = 11796766 | pmc = 1737733 | doi = 10.1136/jnnp.72.2.179 | url = http://jnnp.bmj.com/cgi/pmidlookup?view=long&pmid=11796766 }}</ref><ref>{{cite journal | vauthors = Rabkin JG, McElhiney MC, Rabkin R, Ferrando SJ | title = Modafinil treatment for fatigue in HIV+ patients: a pilot study | journal = The Journal of Clinical Psychiatry | volume = 65 | issue = 12 | pages = 1688–95 | date = December 2004 | pmid = 15641875 | doi = 10.4088/JCP.v65n1215 | url = http://article.psychiatrist.com/?ContentType=START&ID=10001163 }}</ref> as well as fatigue that is the side effect of other medication.<ref name="pmid15367049">{{cite journal | vauthors = Schwartz TL, Azhar N, Cole K, Hopkins G, Nihalani N, Simionescu M, Husain J, Jones N | title = An open-label study of adjunctive modafinil in patients with sedation related to serotonergic antidepressant therapy | journal = The Journal of Clinical Psychiatry | volume = 65 | issue = 9 | pages = 1223–7 | date = September 2004 | pmid = 15367049 | doi = 10.4088/JCP.v65n0910 }}</ref>
+It has been studied for [[major depressive disorder|depression]],<ref>{{cite journal | vauthors = Fava M, Thase ME, DeBattista C, Doghramji K, Arora S, Hughes RJ | title = Modafinil augmentation of selective serotonin reuptake inhibitor therapy in MDD partial responders with persistent fatigue and sleepiness | journal = Annals of Clinical Psychiatry | volume = 19 | issue = 3 | pages = 153–9 | year = 2007 | pmid = 17729016 | doi = 10.1080/10401230701464858 }}</ref> [[bipolar depression]],<ref name="pmid17671288">{{cite journal | vauthors = Frye MA, Grunze H, Suppes T, McElroy SL, Keck PE, Walden J, Leverich GS, Altshuler LL, Nakelsky S, Hwang S, Mintz J, Post RM | title = A placebo-controlled evaluation of adjunctive modafinil in the treatment of bipolar depression | journal = The American Journal of Psychiatry | volume = 164 | issue = 8 | pages = 1242–9 | date = August 2007 | pmid = 17671288 | doi = 10.1176/appi.ajp.2007.06060981 }}</ref><ref name="pmid20673554">{{cite journal | vauthors = Calabrese JR, Ketter TA, Youakim JM, Tiller JM, Yang R, Frye MA | title = Adjunctive armodafinil for major depressive episodes associated with bipolar I disorder: a randomized, multicenter, double-blind, placebo-controlled, proof-of-concept study | journal = The Journal of Clinical Psychiatry | volume = 71 | issue = 10 | pages = 1363–70 | date = October 2010 | pmid = 20673554 | doi = 10.4088/JCP.09m05900gry }}</ref> [[opiate]] and [[cocaine dependence]],<ref name="pmid20631691">{{cite journal | vauthors = Tahsili-Fahadan P, Carr GV, Harris GC, Aston-Jones G | title = Modafinil blocks reinstatement of extinguished opiate-seeking in rats: mediation by a glutamate mechanism | journal = Neuropsychopharmacology | volume = 35 | issue = 11 | pages = 2203–10 | date = October 2010 | pmid = 20631691 | pmc = 2939923 | doi = 10.1038/npp.2010.94 }}</ref><ref name="pmid15525998"/> [[Parkinson's disease]],<ref>{{cite journal | vauthors = van Vliet SA, Vanwersch RA, Jongsma MJ, van der Gugten J, Olivier B, Philippens IH | title = Neuroprotective effects of modafinil in a marmoset Parkinson model: behavioral and neurochemical aspects | journal = Behavioural Pharmacology | volume = 17 | issue = 5–6 | pages = 453–62 | date = September 2006 | pmid = 16940766 | doi = 10.1097/00008877-200609000-00011 | url = http://meta.wkhealth.com/pt/pt-core/template-journal/lwwgateway/media/landingpage.htm?an=00008877-200609000-00011 }}</ref> and disease-related [[Fatigue (medical)|fatigue]],<ref>{{cite journal | vauthors = Rammohan KW, Rosenberg JH, Lynn DJ, Blumenfeld AM, Pollak CP, Nagaraja HN | title = Efficacy and safety of modafinil (Provigil) for the treatment of fatigue in multiple sclerosis: a two centre phase 2 study | journal = Journal of Neurology, Neurosurgery, and Psychiatry | volume = 72 | issue = 2 | pages = 179–83 | date = February 2002 | pmid = 11796766 | pmc = 1737733 | doi = 10.1136/jnnp.72.2.179 | url = http://jnnp.bmj.com/cgi/pmidlookup?view=long&pmid=11796766 }}</ref><ref>{{cite journal | vauthors = Rabkin JG, McElhiney MC, Rabkin R, Ferrando SJ | title = Modafinil treatment for fatigue in HIV+ patients: a pilot study | journal = The Journal of Clinical Psychiatry | volume = 65 | issue = 12 | pages = 1688–95 | date = December 2004 | pmid = 15641875 | doi = 10.4088/JCP.v65n1215 | url = http://article.psychiatrist.com/?ContentType=START&ID=10001163 }}</ref> as well as fatigue that is the side effect of other medication.<ref name="pmid15367049">{{cite journal | vauthors = Schwartz TL, Azhar N, Cole K, Hopkins G, Nihalani N, Simionescu M, Husain J, Jones N | title = An open-label study of adjunctive modafinil in patients with sedation related to serotonergic antidepressant therapy | journal = The Journal of Clinical Psychiatry | volume = 65 | issue = 9 | pages = 1223–7 | date = September 2004 | pmid = 15367049 | doi = 10.4088/JCP.v65n0910 }}</ref>
 Modafinil may also be an effective and well-tolerated treatment in patients with [[seasonal affective disorder]].<ref name="pmid15306145">{{cite journal | vauthors = Lundt L | title = Modafinil treatment in patients with seasonal affective disorder/winter depression: an open-label pilot study | journal = Journal of Affective Disorders | volume = 81 | issue = 2 | pages = 173–8 | date = August 2004 | pmid = 15306145 | doi = 10.1016/S0165-0327(03)00162-9 }}</ref>
 A [[Randomized controlled trial|randomized]] [[double-blind study]] of modafinil showed that normal healthy volunteers between the ages of 30–44 showed general improvement in alertness as well as mood. In the three-day study, counterbalanced, randomized, crossover, inpatient trial of modafinil 400&nbsp;mg was administered as well as a placebo to the control group. The conclusion demonstrated that modafinil may have general mood-elevating effects in particular for the adjunctive use in [[treatment-resistant depression]].<ref name="Bonaventure"/>
+====Schizophrenia====
+Modafinil and armofadinil have been studied as a complement to antipsychotic medications in the treatment of [[schizophrenia]]. They have been consistently shown to have no effect on positive symptoms or cognitive performance.<ref name="Kane D’Souza Patkar Youakim pp. 1475–1481">{{cite journal | last=Kane | first=John M. | last2=D’Souza | first2=Deepak C. | last3=Patkar | first3=Ashwin A. | last4=Youakim | first4=James M. | last5=Tiller | first5=Jane M. | last6=Yang | first6=Ronghua | last7=Keefe | first7=Richard S. E. | title=Armodafinil as Adjunctive Therapy in Adults With Cognitive Deficits Associated With Schizophrenia | journal=The Journal of Clinical Psychiatry | publisher=Physicians Postgraduate Press, Inc | volume=71 | issue=11 | date=24 August 2010 | issn=0160-6689 | pmid=20816042 | doi=10.4088/jcp.09m05950gry | pages=1475–1481}}</ref><ref name="Andrade Kisely Monteiro Rao 2015 pp. 14–21" /><ref name="Bobo Woodward Sim Jayathilake 2011 pp. 106–113" /> A 2015 [[meta-analysis]] found that modafinil and armofadinil reduce negative symptoms in acutely ill patients, though not stable patients with high negative symptom scores.<ref name="Andrade Kisely Monteiro Rao 2015 pp. 14–21">{{cite journal | last=Andrade | first=Chittaranjan | last2=Kisely | first2=Steve | last3=Monteiro | first3=Ingrid | last4=Rao | first4=Sanjay | title=Antipsychotic augmentation with modafinil or armodafinil for negative symptoms of schizophrenia: Systematic review and meta-analysis of randomized controlled trials | journal=Journal of Psychiatric Research | publisher=Elsevier BV | volume=60 | year=2015 | issn=0022-3956 | doi=10.1016/j.jpsychires.2014.09.013 | pages=14–21}}</ref><!-- This reduction in negative symptoms was not replicated in a 2016 study<ref name="Shoja Shafti Akbari 2016 pp. 45–49" /> --> Among medications demonstrated to be effective for reducing negative symptoms in combination with anti-psychotics, modafinil and armodafinil are among the smallest effect sizes.<ref name="Correll Rubio Inczedy-Farkas Birnbaum">{{cite journal | last=Correll | first=Christoph U. | last2=Rubio | first2=Jose M. | last3=Inczedy-Farkas | first3=Gabriella | last4=Birnbaum | first4=Michael L. | last5=Kane | first5=John M. | last6=Leucht | first6=Stefan | title=Efficacy of 42 Pharmacologic Cotreatment Strategies Added to Antipsychotic Monotherapy in Schizophrenia | journal=JAMA Psychiatry | publisher=American Medical Association (AMA) | volume=74 | issue=7 | date=1 June 2017 | issn=2168-622X | doi=10.1001/jamapsychiatry.2017.0624 |at=Figure 4}}</ref> One study found that Armodafinil improved [[anhedonia]]–[[asociality]], but not other negative symptom domains.<ref name="Bobo Woodward Sim Jayathilake 2011 pp. 106–113">{{cite journal | last=Bobo | first=William V. | last2=Woodward | first2=Neil D. | last3=Sim | first3=Min Young | last4=Jayathilake | first4=Karuna | last5=Meltzer | first5=Herbert Y. | title=The effect of adjunctive armodafinil on cognitive performance and psychopathology in antipsychotic-treated patients with schizophrenia/schizoaffective disorder: A randomized, double-blind, placebo-controlled trial | journal=Schizophrenia Research | publisher=Elsevier BV | volume=130 | issue=1-3 | year=2011 | issn=0920-9964 | doi=10.1016/j.schres.2011.05.015 | pages=106–113}}</ref> Modafinil has also been shown to bring significant improvement in subjective measures of schizophrenia condition such as the Psychological General Well-Being Schedule and the Nurses Observation Scale for Inpatient Evaluation.<ref name="Shoja Shafti Akbari 2016 pp. 45–49">{{cite journal | last=Shoja Shafti | first=Saeed | last2=Akbari | first2=Sasan | title=Intractability of Deficit Syndrome of Schizophrenia Against Adjunctive Modafinil | journal=Journal of Clinical Psychopharmacology | publisher=Ovid Technologies (Wolters Kluwer Health) | volume=36 | issue=1 | year=2016 | issn=0271-0749 | doi=10.1097/jcp.0000000000000437 | pages=45–49}}</ref>
+Modafinil and armodafinil are considered reasonably safe and well tolerated for schizophrenia patients.<ref name="Andrade Kisely Monteiro Rao 2015 pp. 14–21" /> However, researchers caution of potential [[drug interaction]]s with [[atypical antipsychotic]] medications, since most atypical antipsychotics are [[metabolism|metabolized]] by [[enzymes]] that modafinil or armodafinil induce. These drug interactions may take months to have evident results, obscuring the interaction.<ref name="Andrade pp. 1633–1634">{{cite journal | last=Andrade | first=Chittaranjan | title=Delayed Drug Interactions in Psychiatry: Armodafinil and Risperidone as a Potential Case in Point | journal=The Journal of Clinical Psychiatry | publisher=Physicians Postgraduate Press, Inc | volume=76 | issue=12 | date=23 December 2015 | issn=0160-6689 | pmid=26717524 | doi=10.4088/jcp.15f10514 | pages=1633–1634}}</ref>
 ===Cocaine addiction===

v t e Stimulants
Adamantanes	Adapromine Amantadine Bromantane Memantine Rimantadine
Adenosine antagonists	8-Chlorotheophylline 8-Cyclopentyltheophylline 8-Phenyltheophylline Aminophylline Caffeine CGS-15943 Dimethazan Istradefylline Paraxanthine SCH-58261 Theobromine Theophylline
Alkylamines	Cyclopentamine Cypenamine Cyprodenate Heptaminol Isometheptene Levopropylhexedrine Methylhexaneamine Octodrine Propylhexedrine Tuaminoheptane
Ampakines	CX-516 CX-546 CX-614 CX-691 CX-717 IDRA-21 LY-404,187 LY-503,430 Nooglutyl Org 26576 PEPA S-18986 Sunifiram Unifiram
Arylcyclohexylamines	Benocyclidine Dieticyclidine Esketamine Eticyclidine Gacyclidine Ketamine Phencyclamine Phencyclidine Rolicyclidine Tenocyclidine Tiletamine
Benzazepines	6-Br-APB SKF-77434 SKF-81297 SKF-82958
Cathinones	3-Fluoromethcathinone 3,4-DMMC 4-BMC 4-CMC 4-Methylbuphedrone 4-Methylcathinone 4-MEAP 4-Methylpentedrone Amfepramone Benzedrone Buphedrone Bupropion Butylone Cathinone Dimethylcathinone Ethcathinone Ethylone Flephedrone Hexedrone Isoethcathinone Mephedrone Methcathinone Methedrone Methylenedioxycathinone Methylone Mexedrone N-Ethylbuphedrone N-Ethylhexedrone Pentedrone Pentylone Phthalimidopropiophenone
Cholinergics	A-84,543 A-366,833 ABT-202 ABT-418 AR-R17779 Altinicline Anabasine Arecoline Bradanicline Cotinine Cytisine Dianicline Epibatidine Epiboxidine GTS-21 Ispronicline Nicotine PHA-543,613 PNU-120,596 PNU-282,987 Pozanicline Rivanicline Sazetidine A SIB-1553A SSR-180,711 TC-1698 TC-1827 TC-2216 Tebanicline UB-165 Varenicline WAY-317,538
Convulsants	Anatoxin-a Bicuculline DMCM Flurothyl Gabazine Pentetrazol Picrotoxin Strychnine Thujone
Eugeroics	Adrafinil Armodafinil CRL-40,940 CRL-40,941 Fluorenol Modafinil
Oxazolines	4-Methylaminorex Aminorex Clominorex Cyclazodone Fenozolone Fluminorex Pemoline Thozalinone
Phenethylamines	1-(4-Methylphenyl)-2-aminobutane 1-Methylamino-1-(3,4-methylenedioxyphenyl)propane 2-Fluoroamphetamine 2-Fluoromethamphetamine 2-OH-PEA 2-Phenyl-3-aminobutane 2,3-MDA 3-Fluoroamphetamine 3-Fluoroethamphetamine 3-Methoxyamphetamine 3-Methylamphetamine 4-Fluoroamphetamine 4-Fluoromethamphetamine 4-MA 4-MMA 4-MTA 6-FNE AL-1095 Alfetamine a-Ethylphenethylamine Amfecloral Amfepentorex Amidephrine 2-Amino-1,2-dihydronaphthalene 2-Aminoindane 5-(2-Aminopropyl)indole 2-Aminotetralin Acridorex Amphetamine (Dextroamphetamine, Levoamphetamine) Amphetaminil Arbutamine β-Methylphenethylamine β-Phenylmethamphetamine Benfluorex Benzphetamine BDB BOH 3-Benzhydrylmorpholine BPAP Camfetamine Cathine Chlorphentermine Cilobamine Cinnamedrine Clenbuterol Clobenzorex Cloforex Clortermine Cypenamine D-Deprenyl Denopamine Dimethoxyamphetamine Dimethylamphetamine Dobutamine DOPA (Dextrodopa, Levodopa) Dopamine Dopexamine Droxidopa EBDB Ephedrine Epinephrine Epinine Etafedrine Ethylnorepinephrine Etilamfetamine Etilefrine Famprofazone Fencamfamin Fencamine Fenethylline Fenfluramine (Dexfenfluramine, Levofenfluramine) Fenproporex Feprosidnine Fludorex Formetorex Furfenorex Gepefrine Hexapradol HMMA Hordenine 4-Hydroxyamphetamine 5-Iodo-2-aminoindane Ibopamine Indanylamphetamine Iofetamine Isoetarine Isoprenaline L-Deprenyl (Selegiline) Lefetamine Lisdexamfetamine Lophophine MBDB MDA (tenamfetamine) MDBU MDEA MDMA (midomafetamine) MDMPEA MDOH MDPR MDPEA Mefenorex Mephentermine Metanephrine Metaraminol Mesocarb Methamphetamine (Dextromethamphetamine, Levomethamphetamine) Methoxamine Methoxyphenamine MMA Methoxyphenamine MMDA MMDMA MMMA Morforex N,alpha-Diethylphenylethylamine N,N-Dimethylphenethylamine Naphthylamphetamine Nisoxetine Norepinephrine Norfenefrine Norfenfluramine Normetanephrine L-Norpseudoephedrine Octopamine Orciprenaline Ortetamine Oxifentorex Oxilofrine PBA PCA PCMA PHA Pentorex Phenatine Phenpromethamine Phentermine Phenylalanine Phenylephrine Phenylpropanolamine Pholedrine PIA PMA PMEA PMMA PPAP Prenylamine Propylamphetamine Pseudoephedrine Ropinirole Salbutamol (Levosalbutamol) Sibutramine Solriamfetol Synephrine Theodrenaline Tiflorex Tranylcypromine Tyramine Tyrosine Xylopropamine Zylofuramine
Phenylmorpholines	3-Fluorophenmetrazine Fenbutrazate Fenmetramide G-130 Manifaxine Morazone Morforex Oxaflozane PD-128,907 Phendimetrazine Phenmetrazine 2-Phenyl-3,6-dimethylmorpholine Pseudophenmetrazine Radafaxine
Piperazines	2C-B-BZP 3C-PEP BZP CM156 DBL-583 GBR-12783 GBR-12935 GBR-13069 GBR-13098 GBR-13119 MeOPP MBZP oMPP Vanoxerine
Piperidines	1-Benzyl-4-(2-(diphenylmethoxy)ethyl)piperidine 2-Benzylpiperidine 2-Methyl-3-phenylpiperidine 3,4-Dichloromethylphenidate 4-Benzylpiperidine 4-Fluoromethylphenidate 4-Methylmethylphenidate Desoxypipradrol Difemetorex Diphenylpyraline Ethylnaphthidate Ethylphenidate Methylnaphthidate Isopropylphenidate JZ-IV-10 Methylphenidate (Dexmethylphenidate) Nocaine Phacetoperane Pipradrol Propylphenidate Serdexmethylphenidate SCH-5472
Pyrrolidines	2-Diphenylmethylpyrrolidine 4-Cl-PVP 5-DBFPV α-PPP α-PBP α-PCYP α-PHiP α-PHP α-PHPP α-PVP α-PVT Diphenylprolinol DMPVP FPOP FPVP MDPPP MDPBP MPBP MPHP MPPP MOPVP MOPPP Indapyrophenidone MDPV Naphyrone PEP Picilorex Prolintane Pyrovalerone
Racetams	Oxiracetam Phenylpiracetam Phenylpiracetam hydrazide
Tropanes	4-fluorotropacocaine 4'-Fluorococaine Altropane (IACFT) Brasofensine CFT (WIN 35,428) β-CIT (RTI-55) Cocaethylene Cocaine Dichloropane (RTI-111) Difluoropine FE-β-CPPIT FP-β-CPPIT Ioflupane (¹²³I) Norcocaine PIT PTT RTI-31 RTI-32 RTI-51 RTI-112 RTI-113 RTI-120 RTI-121 (IPCIT) RTI-126 RTI-150 RTI-177 RTI-229 RTI-336 RTI-354 RTI-371 RTI-386 Salicylmethylecgonine Tesofensine Troparil (β-CPT, WIN 35,065-2) Tropoxane WF-23 WF-33
Tryptamines	4-HO-αMT 4-Methyl-αET 4-Methyl-αMT 5-Chloro-αMT 5-Fluoro-αMT 5-MeO-αET 5-MeO-αMT 5-MeO-DIPT 6-Fluoro-αMT 7-Methyl-αET αET αMT
Others	2-MDP 3,3-Diphenylcyclobutanamine Amfonelic acid Amineptine Amiphenazole Atipamezole Atomoxetine Bemegride Benzydamine BTQ BTS 74,398 Centanafadine Ciclazindol Clofenciclan Cropropamide Crotetamide D-161 Desipramine Diclofensine Dimethocaine Efaroxan Etamivan Fenisorex Fenpentadiol Gamfexine Gilutensin GSK1360707F GYKI-52895 Hexacyclonate Idazoxan Indanorex Indatraline JNJ-7925476 Lazabemide Leptacline Lomevactone LR-5182 Mazindol Meclofenoxate Medifoxamine Mefexamide Methamnetamine Methastyridone Methiopropamine Naphthylaminopropane Nefopam Nikethamide Nomifensine O-2172 Oxaprotiline PNU-99,194 PRC200-SS Rasagiline Rauwolscine Rubidium chloride Setazindol Tametraline Tandamine Thiopropamine Thiothinone Trazium UH-232 Yohimbine
ATC code: N06B