Vasodilators - WHNP

Vasodilators are medications that relax vascular smooth muscle to change resistance, venous return, or pulmonary vascular tone. They can relieve ischemic chest discomfort, reduce severe blood pressure, lower afterload in selected heart failure contexts, and improve perfusion in tightly controlled settings. The safety problem is that the same mechanism can also cause hypotension, syncope, reflex tachycardia, worsening ischemia, fluid retention, or toxic metabolite accumulation. For WHNP, the key is not memorizing a drug list. It is asking what vessel bed is being relaxed, what hemodynamic problem is being treated, and what complication would harm the patient first. This route emphasizes pregnancy screening, severe hypertension in pregnancy contexts, nitrate counseling, reproductive medication safety, and urgent referral.