Adult Initially 12.5 mg once or bd on the 1st day followed by 1 or 2 tab of 25 mg on the 2nd day. If well tolerated, may increase dose in increments of 25-50 mg/day up to 300 mg/day after 2-3 wk. If necessary, may further increase dose in increments of 50-100 mg/wk twice or preferably once a wk. Max: 900 mg/day.
Elderly Initially 12.5 mg on the 1st day, may increase to not >25 mg/day.
Resumption of therapy after interval of >2 days 12.5 mg once or bd on the 1st day.