Tadacip is a prescription medication used to treat erectile dysfunction (ED), benign prostatic hyperplasia (BPH) (enlarged prostate), and pulmonary arterial hypertension (PAH). Its active ingredient is tadalafil. The dosage and duration of treatment are determined by a doctor based on the patient's condition. It can be taken as an on-demand dose (at least 30 minutes before sexual activity) or as a once-daily dose.