Ask your doctor if you are not sure whether any of your medications contain nitrates. Subsequently, the FDA approved both vardenafil [27] and tadalafil in From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. If you experience chest pain, dizziness, or nausea during sexual activity, call your doctor immediately or get emergency medical treatment, and avoid sexual activity until your doctor tells you otherwise. Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. Continue to take tadalafil even if you feel well.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.  · Adults—5 milligrams (mg) as a single dose, no more than once a day, taken at the same time each day. Children—Use is not recommended. For treatment of erectile Missing: reddit. Your doctor will prescribe the dosage that best fits your needs. The recommended Cialis dosage can range from milligrams (mg) to 20 mg per day. For Missing: reddit.