Tadalafil was found to have similar benefits for lower urinary tract symptoms as the usually prescribed tamsulosin. If your dose is different, do not change it unless your doctor tells you to do so. If you are taking tadalafil on a regular schedule, take it at around the same time every day. Comparison with actions of other PDE5 inhibitors[ edit ] Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil. This medicine is available only with your doctor’s prescription. What special dietary instructions should I follow? Also, do not stop taking this medicine without checking first with your doctor.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. Tadalafil is a generic medication for ED, and a person can expect to pay in the region of $ each month for this drug. The brand-name version of tadalafil is Cialis, which can sometimes cost. Tadalafil (Generic Cialis) Get Tadalafil mailed to you after an online visit with a member of our medical team. We can give you a prescription for 10 Generic Cialis pills at a time, with 11 refills. Make sure you know your blood pressure before you start a visit. Get started.