amantadine (Symmetrel - Discontinued) (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:


PREPARATIONS: Capsule: 100 mg. Syrup: 50 mg/5 ml (teaspoon).

STORAGE: Amantadine should be stored at room temperature between 15-30 C (59- 86 F).

DOSING: Amantadine is taken once or twice daily with or without food. If it causes an upset stomach, it can be taken with food. The dosage for prevention and treatment of influenza A infections in adults is 200 mg daily. For treatment of influenza, amantadine should be started within 24 to 48 hours after the onset of signs or symptoms and should be continued for 24 to 48 hours after the disappearance of signs or symptoms. To prevent influenza, amantadine should be started as soon as possible after exposure to the influenza virus and continued for at least 10 days. Persons with reduced kidney function and elderly persons may need lower doses (or less frequent doses).

The dosage for treating Parkinson's or extrapyramidal symptoms is 100 mg twice daily.

DRUG INTERACTIONS: Amantadine adds to the sedating effects of alcohol and other sedating drugs such as:

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.

Back to Medications Index