Olsavas 40mg Tablet does not have a diuretic. Olsavas 40mg Tablet is a medicine used to lower high blood pressure. It belongs to a group of medicines called angiotensin receptor blocker (ARB). These medicines lower blood pressure by relaxing the blood vessels. When prescribed by a doctor, Olsavas 40mg Tablet can also be combined with a diuretic for providing additional benefit in the reduction of blood pressure.