Micardis (telmisartan) how does it work?

Blocks receptors: Micardis (telmisartan) is an angiotensin receptor blocker or arb. So...Your kidney makes a hormone called renin that provides one step to eventually convert angiotensin into its active form (a2). Then angiotensin2 binds to a receptor to effect a squeeze on blood vessels, increase thirst, adrenal activity and salt retension which all raise blood pressure, so the blocker stops all that and treats hypertension.