You should take tadalafil one time a day. Tell your doctor if tadalafil is not working well or if you are experiencing side effects. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. One of these is PAH. Though this growth is not cancerous, prostate cancer and BPH can co-occur. This product is available in the following dosage forms: Suspension Tablet There is a problem with information submitted for this request.Cialis is used to treat erectile dysfunction (impotence) and symptoms of benign prostatic hypertrophy (enlarged prostate). Another brand of tadalafil is Adcirca, which is used to treat pulmonary arterial hypertension .  · Cialis (tadalafil) is a prescription tablet used for erectile dysfunction and benign prostatic hyperplasia. Learn about dosage, side effects, and more. Health Conditions.  · Cialis; Descriptions. 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. These medicines prevent an enzyme called phosphodiesterase type-5 from working too quickly. The .