|Pregnancy cat.||C (US)|
|Legal status||Schedule III (US)|
Fioricet and Esgic are brand names of a combination of butalbital (a barbiturate), acetaminophen and caffeine which is indicated for the treatment of tension headaches, muscle contraction headaches and post-dural puncture headaches. Although not indicated, they are commonly used to treat migraines and other pain related ailments.
New Fioricet Formulation
Per FDA guidelines recommending that manufacturers limit the dose of acetaminophen in prescription products, the formulation of fioricet has changed. "Old formulations" of fioricet contained 50 mg of butalbital, 325 mg of acetaminophen and 40 mg caffeine; "new formulations" contain 50 mg of butalbital, 300 mg of acetaminophen and 40 mg caffeine. Manufacturers are allowed to make the "old formulation" of fioricet until 1/1/2014. Currently there is no move to remove or destroy the "old formulation", allowing for an odd situation in which there could be two different formulations of fioricet in pharmacies.
|Formulation||DEA Schedule||Butalbital (mg)||Acetaminophen (mg)||Caffeine (mg)||Form|
Potential Problems of two formulations
The "new formulation" is also a schedule III controlled substance in the US. This change in designation affects mid-level providers, such as ARNPs and PAs, who are not allowed to prescribe controlled substances in some jurisdictions. Ostensibly, prescribers that are affected by this change could clearly indicate on the prescription that they would like the "old formulation" (perhaps by writing out the mg combination) until the "old formulation" is no longer available. Pharmacists dispensing or verifying this medication need to be keenly aware of the difference in formulation and CSA scheduling, as a misfill of the scheduled "new formulation" for the "old formulation" could have legal ramifications. Delays in verification and dispensing, or invalidation of a prescription due to a mid-level provider not having the ability to prescribe the controlled "newer formulation" could likewise affect patients through delays and hassles.
Usage and dosage
Fioricet is indicated for the treatment of muscle tension or muscle contraction headaches. It is also commonly prescribed for migraines although it is not FDA indicated for this use in the United States. The usual adult dose is 1-2 tablets every four hours as needed, not exceeding six tablets in a 24 hour period.
Mechanism of action
Butalbital has generalized depressant effect on central nervous system and, in very high doses, has peripheral effects. Acetaminophen has analgesic and antipyretic effects; its analgesic effects may be mediated through inhibition of prostaglandin synthetase enzyme complex. Caffeine is thought to produce constriction of cerebral blood vessels.
Butalbital has a half-life of about 35 hours. Acetaminophen has a half-life of about 1.25 to 3 hours, but may be increased by liver damage and after an overdose. Caffeine has a half-life of about 5 to 7 hours.
Commonly reported side effects for Fioricet include:
- Intoxicated feeling
- Substance dependence
- Shortness of breath
- Abdominal pain
Fioricet is implicated as causing repeat headaches with over-use.
- Stevens–Johnson syndrome, an adverse reaction to barbiturates
|Name||DEA Schedule||Acetaminophen (mg)||Aspirin (mg)||Butalbital (mg)||Caffeine (mg)||Codeine (mg)||Labeller||Form||End Marketing Date|
|Esgic||CIII||325||50||40||Forrest Laboratories, Inc||capsule, tablet|
|Esgic Plus||CIII||500||50||40||Forrest Laboratories, Inc; A-S Medication Solutions LLC||capsule, tablet||6/29/2014; 8/10/2015|
|Fioricet (new formulation)||CIII||300||50||40||Watson Pharma, Inc.||capsule|
|Fioricet (old formulation)||CIII||325||50||40||Cardinal Health||tablet||1/1/2014|
|Fioricet with codeine||CIII||300||50||40||30||Watson Pharma, Inc.||capsule|
|Fiorinal||CIII||325||50||40||Watson Pharma, Inc.||capsule|
|Fiorinal with codeine||CIII||325||50||40||30||Watson Pharma, Inc.||capsule|
|Phrenilin||CIII||325||50||Valeant Pharmaceuticals International||tablet|
|Phrenilin Forte||CIII||650||50||Valeant Pharmaceuticals International||capsule|
|Phrenilin with caffeine and codeine||CIII||325||50||40||30||Valeant Pharmaceuticals North America||capsule|
- Food and Drug Administration. FDA drug safety communication: prescription acetaminophen products to be limited to 325 mg per dosage unit; boxed warning will highlight potential for severe liver failure.
- (Old formulation) Fioricet package insert, Cardinal Health, Inc.
- (New formulation) Fioricet package insert, Watson Pharma, Inc.
- Fioricet at RxList
- A Hidden Cause of Headache Pain - New York Times
- Esgic tablet package insert, Forest Laboratories, Inc
- Esgic capsule package insert, Forest Laboratories, Inc
- Esgic Plus capsule package insert, Forest Laboratories, Inc
- Esgic Plus tablet package insert, Forest Laboratories, Inc
- Esgic Plus tablet package insert, A-S Medication Solutions LLC
- Fioricet with codeine capsule package insert, Watson Pharma, Inc
- Fiorinal capsule package insert, Watson Pharma, Inc
- Fiorinal with codeine capsule package insert, Watson Pharma, Inc
- Phrenilin tablet package insert, Valeant Pharmaceuticals North America
- Phrenilin Forte capsule package insert, Valeant Pharmaceuticals International
- Phrenilin (butalbital, acetaminophen, caffeine, and codeine phosphate) capsule package insert, Valeant Pharmaceuticals North America