A psychiatric medication is a licensed psychoactive drug taken to exert an effect on the chemical makeup of the brain and nervous system. Thus, these medications are used to treat mental disorders. Usually prescribed in psychiatric settings, these medications are typically made of synthetic chemical compounds, although some are naturally occurring, or at least naturally derived. Since the mid-20th century, such medications have been leading treatments for a broad range of mental disorders and have decreased the need for long-term hospitalization therefore lowering the cost of mental health care.
Modern psychiatric medication has advanced greatly in the past century. The Reuptake Hypothesis by Julius Axelrod involves the interaction among neurotransmitters, and forms the cornerstone of the development of modern psychotropic drugs. His work allowed researchers to further advance their studies into the effects of psychiatric medication. Mental health medications were first introduced in the mid-20th century with the widespread introduction of chlorpromazine, an antipsychotic. The popularity of these drugs have skyrocketed since then, with millions prescribed annually.
Psychiatric medications are prescription medications, requiring a prescription from a physician, such as a psychiatrist, or a psychiatric nurse practitioner, PMHNP, before they can be obtained. Some U.S. states and territories, following the creation of the prescriptive authority for psychologists movement, have granted prescriptive privileges to clinical psychologists who have undergone additional specialised education and training in medical psychology. In addition to the familiar dosage in pill form, psychiatric medications are evolving into more novel methods of drug delivery. New technologies include transdermal, transmucosal, inhalation, and suppository supplements.
Psychopharmacology studies a wide range of substances with various types of psychoactive properties. The professional and commercial fields of pharmacology and psychopharmacology do not typically focus on psychedelic or recreational drugs, and so the majority of studies are conducted on psychiatric medication. While studies are conducted on all psychoactive drugs by both fields, psychopharmacology focuses on psychoactive and chemical interactions within the brain. Physicians who research psychiatric medications are psychopharmacologists, specialists in the field of psychopharmacology.
Adverse and withdrawal effects
Psychiatric medications carry risk for adverse effects. The occurrence of adverse effects can potentially reduce drug compliance. Some adverse effects can be treated symptomatically by using adjunct medications such as anticholinergics (antimuscarinics). Some rebound or withdrawal adverse effects, such as the possibility of a sudden or severe emergence or re-emergence of psychosis in antipsychotic withdrawal, may appear when the drugs are discontinued, or discontinued too rapidly.
There are six main groups of psychiatric medications.
- Antidepressants, which treat disparate disorders such as clinical depression, dysthymia, anxiety, eating disorders and borderline personality disorder.
- Antipsychotics, which treat psychotic disorders such as schizophrenia and psychotic symptoms occurring in the context of other disorders such as mood disorders.
- Anxiolytics, which treat anxiety disorders.
- Depressants, which are used as hypnotics, sedatives, and anesthetics.
- Mood stabilizers, which treat bipolar disorder and schizoaffective disorder.
- Stimulants, which treat disorders such as attention deficit hyperactivity disorder and narcolepsy.
Antidepressants are drugs used to treat clinical depression, and they are also often used for anxiety and other disorders. Most antidepressants will hinder the breakdown of serotonin or norepinephrine or both. A commonly used class of antidepressants are called selective serotonin reuptake inhibitors (SSRIs), which act on serotonin transporters in the brain to increase levels of serotonin in the synaptic cleft. SSRIs will often take 3–5 weeks to have a noticeable effect, as the regulation of receptors in the brain adapts. There are multiple classes of antidepressants which have different mechanisms of action. Another type of antidepressant is a monoamine oxidase inhibitor, which is thought to block the action of Monoamine oxidase, an enzyme that breaks down serotonin and norepinephrine. MAOIs are not used as first-line treatment due to the risk of hypertensive crisis related to the consumption of foods containing the amino acid tyramine.
- Fluoxetine (Prozac), SSRI
- Paroxetine (Paxil, Seroxat), SSRI
- Citalopram (Celexa), SSRI
- Escitalopram (Lexapro), SSRI
- Sertraline (Zoloft), SSRI
- Duloxetine (Cymbalta), SNRI
- Venlafaxine (Effexor), SNRI
- Bupropion (Wellbutrin), NDRI
- Mirtazapine (Remeron), NaSSA
- Isocarboxazid (Marplan), MAOI
- Phenelzine (Nardil), MAOI
Antipsychotics are drugs used to treat various symptoms of psychosis, such as those caused by psychotic disorders or schizophrenia. Atypical antipsychotics are also used as mood stabilizers in the treatment of bipolar disorder, and they can augment the action of antidepressants in major depressive disorder. Antipsychotics are sometimes referred to as neuroleptic drugs and some antipsychotics are branded "major tranquilizers".
- Chlorpromazine (Thorazine)
- Haloperidol (Haldol)
- Perphenazine (Trilafon)
- Thioridazine (Melleril)
- Thiothixene (Navane)
- Flupenthixol (Fluanxol)
- Trifluoperazine (Stelazine)
- Aripiprazole (Abilify)
- Clozapine (Clozaril)
- Olanzapine (Zyprexa)
- Paliperidone (Invega)
- Quetiapine (Seroquel)
- Risperidone (Risperdal)
- Zotepine (Nipolept)
- Ziprasidone (Geodon)
Anxiolytics & hypnotics
Benzodiazepines are effective as hypnotics, anxiolytics, anticonvulsants, myorelaxants and amnesics, but are generally recommended for short-term use. They have widely supplanted barbiturates because they have less proclivity for overdose and toxicity.
Developed in the 1950s onward, they were originally thought to be non-addictive at therapeutic doses. They are now known to cause withdrawal symptoms similar to barbiturate and alcohol withdrawal, and a severe withdrawal syndrome may last for months and years in approximately 15% of users.
Common benzodiazepines and derivatives include:
- Diazepam (Valium), benzodiazepine derivative, anxiolytic
- Nitrazepam (Mogadon), benzodiazepine derivative, hypnotic
- Zolpidem (Ambien, Stilnox), an imidazopyridine, non-benzodiazepine hypnotic
- Zopiclone (Imovan), non-benzodiazepine hypnotic ("Z-drug")
- Eszopiclone (Lunesta), non-benzodiazepine hypnotic ("Z-drug")
- Zaleplon (Sonata), non-benzodiazepine hypnotic ("Z-drug")
- Chlordiazepoxide (Librium), benzodiazepine derivative, anxiolytic
- Alprazolam (Xanax), benzodiazepine derivative, anxiolytic
- Temazepam (Restoril), benzodiazepine derivative
- Clonazepam (Klonopin), benzodiazepine derivative
- Lorazepam (Ativan), benzodiazepine derivative, anxiolytic
In 1949, the Australian John Cade discovered that lithium salts could control mania, reducing the frequency and severity of manic episodes. This introduced the now popular drug lithium carbonate to the mainstream public, as well as being the first mood stabilizer to be approved by the U.S. Food & Drug Administration. Besides lithium, several anticonvulsants and atypical antipsychotics have mood stabilizing activity. The mechanism of action of mood stabilizers is not well understood.
Common mood stabilizers:
- Lithium carbonate (Carbolith), first and typical mood stabilizer
- Carbamazepine (Tegretol), anticonvulsant and mood stabilizer
- Oxcarbazepine (Trileptal), anticonvulsant and mood stabilizer
- Valproic acid, and Valproic acid salts (Depakine, Depakote), anticonvulsant and mood stabilizer
- Lamotrigine (Lamictal), atypical anticonvulsant and mood stabilizer
- Gabapentin, atypical GABA-related anticonvulsant and mood stabilizer
- Pregabalin, atypical GABA-ergic anticonvulsant and mood stabilizer
- Topiramate, GABA-receptor related anticonvulsant and mood-stabilizer
- Olanzapine, atypical antipsychotic and mood stabilizer
A stimulant is any drug that stimulates the central nervous system. Stimulants can be addictive, and patients with a history of drug abuse are typically monitored closely or even barred from use and given an alternative. Discontinuing treatment without tapering the dose can cause psychological withdrawal symptoms such as anxiety and drug craving.
- Methylphenidate (Ritalin, Concerta), a norepinephrine-dopamine reuptake inhibitor
- Dexmethylphenidate (Focalin), the active D-isomer of methylphenidate
- Mixed Amphetamine Salts (Adderall), a 3:1 mix of D-/L- isomers of amphetamine
- Dextroamphetamine (Dexedrine), the D- isomer of amphetamine
- Lisdexamfetamine (Vyvanse), a prodrug containing the D- isomer of amphetamine
- Methamphetamine (Desoxyn), a potent but rarely prescribed amphetamphetamine-based stimulant
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