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 Solution — Current selected SmPCemc · Summary of Product Characteristics
- Amantadine hydrochloride 100mg capsules — Current selected SmPCemc · Summary of Product Characteristics