antihypertensive

An antihypertensive is any drug whose job is to bring high blood pressure down. Think of the circulation as a garden hose: pressure rises if you turn the tap up (the heart pumps harder), pinch the hose (vessels narrow), or cram in too much water (excess fluid). Different antihypertensives ease one or more of these, lowering the squeeze on artery walls.

There is no single antihypertensive molecule; the term covers several drug classes that act through distinct mechanisms. The main families are ACE inhibitors and angiotensin receptor blockers (which dampen the renin–angiotensin–aldosterone system), calcium channel blockers (which relax arterial smooth muscle), thiazide diuretics (which shed sodium and water), and beta-blockers (which slow the heart and reduce its output). Doctors often combine low doses from two classes to control pressure with fewer side effects than one drug at high dose.

Lowering blood pressure matters because sustained hypertension silently damages arteries, the heart, kidneys, brain and eyes, raising the risk of stroke, heart attack and kidney failure. The goal is usually a long-term, gradual reduction rather than a sudden drop; over-aggressive treatment can cause dizziness, falls and reduced organ perfusion, so therapy is titrated to the individual.