Tadalista CT 20 is a prescription medication that contains tadalafil, a drug used mainly to treat erectile dysfunction (ED) and sometimes benign prostatic hyperplasia (BPH) symptoms. It belongs to the class of phosphodiesterase type 5 (PDE5) inhibitors, which help increase blood flow to certain parts of the body by relaxing blood vessels. Prescription requirement In India and most other countries, Tadalista CT 20 is a prescription-only medicine (Schedule H drug in India). This means you legally cannot buy it without a valid prescription from a registered medical practitioner. A doctor typically prescribes it after evaluating your health history, cardiovascular status, and potential risk factors. Why prescription is required Tadalafil can interact with other medications such as nitrates (used for chest pain), alpha-blockers, and some blood pressure medicines. It may also cause side effects like headache, dizziness, flushing, indigestion, or in rare cases, serious drops in blood pressure. Because of these risks, medical supervision is important before and during use.