Olmesartan is an angiotensin receptor blocker. It is also called an angiotensin-II receptor antagonist, or an AIIRA. You will have been prescribed olmesartan because your blood pressure is too high (hypertension). People with high blood pressure often do not feel unwell but, if left untreated, high blood pressure can harm the heart and damage blood vessels.
This is a companion discussion topic for the original article at https://patient.info/medicine/olmesartan-an-angiotensin-receptor-blocker-olmetec