This allows the smooth muscles in the penis to relax and fill with blood. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department. We considered cost, medications available, and whether generic versions were offered to help reduce costs. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. Read our editorial process. If you ever need emergency medical treatment for a heart problem, the health care providers who treat you will need to know when you last took tadalafil. Ask your pharmacist for a list of the ingredients.You can buy tadalafil at the discounted price of $ by using the MDRx coupon, a savings of 93%. Even if this drug is covered by Medicare or your insurance, we recommend you compare prices. MNT ‘s review At Hims, Cialis is available as: Daily tadalafil: or 5 mg daily pill Tadalafil: 5 mg, 10 mg, or 20 mg, taken as needed Cialis: mg, 5 mg, 10 mg, and 20 mg, taken as needed. Tadalafil (Cialis) is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). Tadalafil works by helping to relax the blood vessels in the penis, allowing blood to flow into the penis, and causing an erection.