Amantadine Tapering and Side Effect Management

Introduction to Amantadine Management

The Centers for Disease Control and Prevention recommends that amantadine side effects are usually mild and cease soon after discontinuing the drug when properly tapered 1, 2, 3, 4

Minor CNS side effects (nervousness, anxiety, insomnia, difficulty concentrating, lightheadedness) occur in approximately 5-13% of patients on 200 mg/day, according to the MMWR Recommendations and Reports 1, 2
Side effects can diminish after the first week despite continued use, as noted by the MMWR Recommendations and Reports 1, 2, 3, 4
For persistent side effects without discontinuation, dose reduction (to ≤100 mg/day in elderly or those with renal impairment) reduces side effect frequency without compromising efficacy, as recommended by the MMWR Recommendations and Reports 2, 5
Serious side effects (behavioral changes, delirium, hallucinations, seizures) are associated with high plasma concentrations, particularly in patients with renal insufficiency, seizure disorders, psychiatric disorders, or elderly patients on 200 mg/day, according to the MMWR Recommendations and Reports 1, 3, 4

Failure to adjust for renal function increases toxicity risk, especially in elderly patients who often have decreased renal clearance, as noted by the Praxis Medical Insights: Practical Summaries of Clinical Guidelines 6, 7