Green Tea There have been studies done that show that green tea is another all natural substance that can replicate the effects of Cialis in the body for the right people. You may attempt sexual activity at any time between doses. After taking a single tablet, some of the active ingredient of Cialis remains in your body for more than 2 days. Your doctor will help you decide the best time for you to take tadalafil before sexual activity. Tadalafil comes as a tablet to take by mouth. Cialis will be available as oral tablets in 5mg, 10mg and 20mg strengths. What if I am taking other drugs?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 and generic tadalafil are available with a prescription only. There is no OTC version, though there have been efforts in recent years to develop a .  · Cialis (tadalafil) is prescribed to treat erectile dysfunction and symptoms of benign prostatic hyperplasia. It comes as a tablet that’s taken as needed or once per .