These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Tadalafil requires a prescription. An erection results from an increase in blood flow to the penis. It’s available in 10 mg and 20 mg tablets. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider.Learn more about Cialis oral This is a generic drug. The average cost for 30 Tablet(s), 5mg each of the generic (tadalafil) is $ You can buy tadalafil at the discounted price of $ · With SingleCare, Cialis costs as little as $ for 30, 20mg Tablet of generic Cialis, which could be more affordable than your insurance. Get our coupons for Cialis online or via our free app, and take them to your local pharmacy to compare prices. Does Medicare cover Cialis and how much does it cost? $ (save %) local_offer_outlined Avg retail price $ 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.