Antihypertensives Part 4 – Nitrates

Nitrates function as potent vasodilators by converting to nitric oxide, which increases cyclic GMP levels to induce smooth muscle relaxation. Primarily utilized for managing angina and acute coronary syndromes, these agents reduce myocardial oxygen demand through venous dilation. While sublingual and intravenous forms provide rapid relief for acute symptoms, transdermal patches serve as prophylactic measures for chronic angina. Maintaining a nitrate-free period of 10 to 14 hours is essential to prevent pharmacological tolerance. Clinicians must exercise extreme caution regarding drug interactions, particularly with PDE5 inhibitors like sildenafil and tadalafil, as concurrent use triggers life-threatening hypotension. Additional considerations include monitoring for common adverse effects such as headaches and reflex tachycardia, alongside educating patients on orthostatic hypotension risks when combining nitrates with other blood pressure-lowering medications.