Use singly or in combination with the other agents listed in this table.
Hydralazine
Vasodilator
10–12.5 mg twice daily, increasing as required
Commence verapamil slow release first to prevent reflex tachycardia. Commencement at low doses reduces risk of side effects (including headaches, flushing, and palpitations).
Prazosin hydrochloride
α-Adrenergic blocker
0.5–1 mg two to three times daily, increasing as required