BPH is common in older men. Potential Side Effects and Interactions While Cialis is generally safe, like all medications, it can have side effects. Share personal information without ensuring the site is secure. To find out if you may be experiencing symptoms of Erectile Dysfunction, take our quiz. You can read more information on the different Tadalafil doses available here. Cialis Daily helps to prevent erectile dysfunction 24 hours a day.Cialis comes in several strengths: milligrams (mg), 5mg, 10 mg, and 20 mg. The Cialis cost per pill and daily cost depend on several factors, such as: the strength prescribed by your doctor. Erectile dysfunction (taken as needed): The typical starting dose is 10 mg by mouth about 30 minutes before sexual activity up to once per day as needed. Your provider will adjust your dose based on your response. • The recommended starting dose of CIALIS for once daily use is mg, taken at approximately the same time every day, without regard to timing of sexual activity. • The CIALIS dose for once daily use may be increased to 5 mg, based on individual efficacy and tolerability. CIALIS for Once Daily Use for Benign Prostatic Hyperplasia.