How do I take amantadine?
Amantadine is taken by mouth (orally) as tablets.
What side effects could I get with amantadine?
Amantadine is generally well tolerated with mild side effects. Side effects can include a dry mouth, constipation, nausea, anxiety and hyperactivity. If you take amantadine within a few hour of going to bed it could lead to difficulty sleeping or vivid dreams. To avoid this, you should take amantadine no later than 2pm.
How does amantadine work?
Amantadine is an antiviral drug, used to treat influenza infections. It is also used to treat Parkinson's disease. Why it is effective for fatigue in some people with MS remains unknown.
Studies have found that amantadine reduced fatigue in between one and two people in five with mild to moderate MS.
More recently a small study in America has looked at the effect of amantadine on walking difficulties in MS. Extended release capsules were taken once daily at bedtime for four weeks. A small improvement in walking speed was seen, which warrants further research.
- Cochrane Database of Systematic Reviews 2007;(1):CD002818. Read the full article Amantadine for fatigue in multiple sclerosis.
- Multiple Sclerosis Journal;25(4):601-609. Summary Safety and efficacy of ADS-5102 (amantadine) extended release capsules to improve walking in multiple sclerosis: a randomized, placebo-controlled, phase 2 trial.