Cialis is also highly effective in reducing the symptoms of BPH. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. When oral medications might not be safe Check with your health care team before you take any medicine for erectile dysfunction. Prolonged erections can be dangerous. Soon, in , ICOS received a patent for compound IC structurally unlike sildenafil and vardenafil , and Phase 1 clinical trials began in Common ones include: Flushing of the skin.Here are some details about Cialis: Drug form: oral tablet; Generic version: tadalafil; Read on to learn about Cialis and cost, as well as how to save money on prescriptions and find the best price. Generic Cialis, or Tadalafil, is available in several doses in tablet form: milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as needed before sexual. 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.