HTN Initially 40-80 mg bid, increased as required to usual range of 160-320 mg daily; some patients may require up to 640 mg daily.
Angina pectoris Initially 40 mg bid-tid, increased as required to usual range of 120-240 mg daily; some patients may require up to 320 mg daily.
MI 40 mg qid for 2-3 days followed by 80 mg bid. Another regimen is to give 180-240 mg daily in divided doses.
Long-term management of cardiac arrhythmias 30-160 mg daily in divided doses.