How many days does avapro (irbesartan) take to lower blood pressure?

About a month.: Most physicians will give a new blood pressure medication about one month to see if it works as long as the blood pressure is not critically high (above180/100). Make sure you are also exercising, eating a low sodium diet (.

Within 12 hours: Irbesartan (avapro) is a long-acting nonpeptide at-ii type 1-receptor antagonist with a plasma half-life of 11-15 hours. The drug is absorbed rapidly after oral administration and has a bioavailability of 60-80%, the highest in its class. After oral administration, peak plasma concentrations are achieved in two hours. That means, starts working at 2 hour and should control BP in 11-15 hours.