| Verapamil slow release |
Nondihydropyridine calcium channel antagonist |
90–120 mg twice daily |
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 |
Monitor for postural hypotension |
| Doxazosin mesylate |
α-Adrenergic blocker |
1–2 mg once daily, increasing as required |
Monitor for postural hypotension |
| Terazosin hydrochloride |
α-Adrenergic blocker |
1–2 mg once daily, increasing as required |
Monitor for postural hypotension |
