PO (Adults): 30–120 mg 3–4 times daily or 180–240 mg once daily as CD or XR capsules or LA tablets (up to 360 mg/day); Concurrent simvastatin therapy: Diltiazem dose should not exceed 240 mg/day and simvastatin dose should not exceed 10 mg/day. IV (Adults): 0.25 mg/kg; may...