Parkinsonism Initially 1 mg the 1st day, 2 mg the 2nd day, then increase by 2 mg daily up to 6-10 mg/day (depending on the optimal level). To be given tid-qid. Drug-induced parkinsonism 5-15 mg daily. Advisable to initiate therapy w/ single 1 mg dose. Elderly (>65 yr) Smaller dose required.