Losartan, sold under the trade name Cozaar among others, is a medication mainly used to treat high blood pressure. It is also used for diabetic kidney disease , heart failure , and left ventricular enlargement. [1] Losartan is an angiotensin receptor blocker. It is also called an angiotensin-II receptor antagonist, or an AIIRA. You will have been prescribed losartan for one of the following reasons: It is also called an angiotensin-II receptor antagonist, or an AIIRA. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Weisberger on is losartan a beta blocker: The calcium channel blocker class. Most beta blockers have a generic name that ends in -ol. Losartan potassium tablets is a prescription medicine called an angiotensin receptor blocker (ARB). It is used: It is used: alone or with other blood pressure medicines to lower high blood pressure (hypertension). The information reflected here is dependent upon the correct functioning of our algorithm. From time-to-time, our system might experience bugs or glitches that affect the accuracy or correct application of mathematical algorithms. Beta blocker stays in your system about three days after stoppingit. You have to gradually stop the beta blocker. It is recommendedto wean off it. Losartan, irbesartan, olmesartan, candesartan, valsartan, fimasartan and azilsartan include the tetrazole group (a ring with four nitrogen and one carbon). Losartan, irbesartan, olmesartan, candesartan, and telmisartan include one or two imidazole groups. Losartan (Cozaar) is a drug prescribed to treat high blood pressure, reduce the risk of stroke in those with hypertension, type 2 diabetes, diabetic neuropathy and kidney disease. Side effects include chest pain, diarrhea, dizziness, fatigue, nasal congestion, UTIs, and weakness. Losartan belongs to the Statin drug class. Most beta blockers have a generic name that ends in -ol. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Weisberger on is the drug cozaar a beta blocker: The calcium channel blocker class. I also have LVH. After my valve reoplacement, I was placed on a beta blocker. I have hypertension that is being controlled with an ACE inhibitor, a water pill, and Losartan.