For long-term prophylactic use (if necessary nitrates should be employed for alleviating acute attacks).
For this indication, competent medicine agencies globally authorize below treatments:
80 - 320 mg
From 26.667 To 106.667 mg 3 time(s) per day every day
80–160 mg total daily dose, given in 2 to 3 doses. If necessary, the dosage can be raised to 320 mg.