Telmisartan belongs to a class of medicines known as angiotensin II receptor blockers. It is used to treat high blood pressure, prevention and treatment of heart attack (myocardial Infarction) and heart failure; when heart is unable to pump sufficient blood. It is also used for kidney failure in patients with diabetes.
Hydrochlorothiazide is used to treat high blood pressure (hypertension). It also treats fluid retention (edema) due to congestive heart failure or cirrhosis of liver or kidney disorder.
Telmisartan blocks the action of a substance (angiotensin II) responsible for narrowing of the blood vessels. It relaxes the blood vessels; thereby lowering blood pressure.
Hydrochlorothiazide belongs to class of medications called thiazide diuretics. It acts by eliminating the fluid and salts from the body. It works on the kidneys to produce more urine which removes extra water and certain salts from the body which in turn lowers blood pressure and swelling.