Find patient medical information for Tadalafil (Cialis, Adcirca, and others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Medscape - Erectile dysfunction, pulmonary arterial hypertension-specific dosing for Adcirca, Cialis (tadalafil), frequency-based adverse effects, comprehensive interactions, contraindications. Tadalafil increases blood flow to particular areas of the body and is used to treat erectile dysfunction. Learn about side effects, interactions and indications. Cialis (Tadalafil) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase 5 (PDE5) inhibitors. Tadalafil is prescribed for benign prostatic hyperplasia, erectile dysfunction, and pulmonary arterial hypertension. Learn about side effects and more. The recommended starting dose of Xtenda-20 for once daily use is 2.5 mg, taken at approximately the same time every day, without regard to timing of sexual activity. The Xtenda-20 dose for once daily use may be increased to 5 mg, based on individual efficacy and tolerability. Tadalafil tablets treat erectile dysfunction by increasing blood flow to your penis. This helps you maintain an erection. It can also treat benign prostatic hyperplasia. Tadalafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, tadalafil works by increasing blood flow to the penis to help a man get and keep an erection. In the study of 10 mg tadalafil for 6 months and the study of 20 mg tadalafil for 9 months, results showed a decrease in mean sperm concentrations relative to placebo, although these differences were not clinically meaningful.