Dosage & Administration
Idiopathic Parkinsonism: 1 mg of Trihexyphenidyl may be administered the first day. The dose may then be increased by 2 mg increments at intervals of three to five days.
Drug-Induced Parkinsonism: Commence therapy with a single 1 mg dose increase the total daily dosage to 5-15 mg range if the extrapyramidal manifestations are not controlled.
Concomitant Use with Levodopa: When Trihexyphenidyl is used concomitantly with levodopa, the usual dose is 3-6 mg daily.