Answer
Abrupt withdrawal can worsen parkinsonism and may rarely cause confusion, delirium or a syndrome involving fever, sweating and severe muscle stiffness. Withdrawal should be planned with the prescriber.
Sources for this answer
- Amantadine hydrochloride 50 mg/5 ml Oral Solutionemc · SmPC Current selected SmPC · Version 1
- Amantadine hydrochloride 100mg capsules