Lonitab is often used to treat severe hypertension (high blood pressure). It is generally used as a second-line treatment when other antihypertensive medicines have not been effective or are not suitable for a patient. It relaxes and widens the blood vessels, allowing blood to flow more easily. This medicine may also reduce the risk of cardiovascular disease and end-organ damage. While the active ingredient is Minoxidil, it also contains other inactive ingredients such as sodium benzoate, sodium starch glycolate, microcrystalline cellulose, anhydrous lactose, and others. Lonitab belongs to a group of medicines called antihypertensives. This medication works by widening the blood vessels. This effect helps to decrease high blood pressure.