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 For ED, Tadalafil can be taken either once per day or as needed before sexual activity, with dosages ranging from 2.5 milligrams (mg) to 20 mg. Tadalafil is in a class of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Understanding Tadalafil Uses and Dosages Tadalafil is a popular medication prescribed for erectile dysfunction (ED) and symptoms of benign prostatic hyperplasia (BPH). Understanding the correct dosage and timing is crucial for safe and effective treatment. This guide breaks down typical doses, how to take them, and wha. Used for the treatment of erectile dysfunction (ED, impotence). May be used as needed (on demand) or on a daily basis (without regard to timing of sexual activity). Experts recommend a selective PDE type 5 inhibitor as first-line therapy for ED unless contraindicated. Tadalafil increases blood flow to particular areas of the body and is used to treat erectile dysfunction. Learn about side effects, interactions and indications. Tadalafil is FDA -approved for males as a therapy to treat and prevent symptoms of benign prostatic hyperplasia, such as urinary urgency, hesitancy, weak stream, dribbling, and incontinence. 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 20 mg is the maximum as-needed dose for ED. Learn about its uses, how long it lasts, side effects, and how to save on your prescription. Tadalafil is available in several dosages, from a minimum dosage of 2.5mg (milligrams) all the way up to a 20mg per tablet, the maximum dose of tadalafil in 24 hours.