Read the privacy policy to understand how your data will be used. Tadalafil is in a class of medications called phosphodiesterase PDE inhibitors. You can avoid potentially awkward encounters at a physical store. Take tadalafil exactly as directed. The table below summarizes the typical dosages for tadalafil: Indications of Tadalafil:. If you have certain health conditions or are taking certain medications, your doctor may tell you to take tadalafil less often or may prescribe a lower dose to be taken once a day.Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men. Cialis is available in a generic version. Cialis form and strengths ( mg, 5 mg, 10 mg, 20 mg) Cialis comes as oral tablets that are available in four strengths: milligrams (mg), 5 mg. 5 mg, 10 mg, 20 mg: 50 mg, mg, mg: What’s the typical dosage? 50 mg: 10 mg as needed or mg daily: Daily Generic Cialis (tadalafil) Generic Cialis (tadalafil) Roman: $90 per dose.