Lonitab 10 mg is an orally active antihypertensive drug-containing Minoxidil as the active ingredient. Minoxidil is a member of drug class vasodilators, which works by relaxing blood vessels and improve blood circulation. This helps to reduce blood pressure. The medicine is specially formulated for hypertensive patients who do not respond to maximum therapeutic doses of diuretic (water pill) and a combination of two antihypertensive drugs. For best results, the medicine should be used under the supervision of a doctor usually in combination with a beta-blocker drug to prevent myocardial workload. Your doctor may also prescribe a water pill to prevent serious fluid accumulation.