Tell your doctor if tadalafil is not working well or if you are experiencing side effects. You may attempt sexual activity at any time between doses. Ask your doctor if you are not sure whether any of your medications contain nitrates. It may take some time and trial and error to determine the best dosage as well as the best time to take Cialis. Tadalafil Adcirca is used to improve the ability to exercise in people with pulmonary arterial hypertension PAH; high blood pressure in the vessels carrying blood to the lungs, causing shortness of breath, dizziness, and tiredness. Your doctor will help you decide the best time for you to take tadalafil before sexual activity.medication_outlined Availability Available See GoodRx coupons warning Are you looking for information on Adcirca (tadalafil) instead? What is Tadalafil (Cialis)? Drug Facts Common Brands Cialis Drug Class PDE-5 inhibitor Controlled Substance Classification Not a controlled medication Generic Status No lower-cost generic available. Tadalafil prices starting at $ Compare prices for Tadalafil and save up to 80% using Inside Rx. Tadalafil prices starting at $ WALGREENS $ $ 1, Get better pricing estimates. Set your location for prices near you. Inside Rx now offers discounts on vaccines! Get the Inside Rx app. 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.