If you are a Mayo Clinic patient, this could include protected health information. Cialis will be available by prescription only. Tadalafil is also used to treat men who have signs and symptoms of benign prostatic hyperplasia BPH. Tadalafil works on the PDE5 enzyme in the lungs to relax the blood vessels. There may be rare occurrences of priapism or painful, prolonged erections.You may be able to get a day supply of Cialis if approved by your insurance company. This could reduce your number of trips to the pharmacy and help . Generic Cialis Tadalafil (Cialis) Switch to brand medication info_outlined Used for Benign Prostatic Hyperplasia and Erectile Dysfunction MORE expand_more Check your . Cialis Now Available as Generic Tadalafil: Here’s What You Need to Know – GoodRx We have good news for you: generic Cialis, used to treat erectile dysfunction .