You may opt-out of email communications at any time by clicking on the unsubscribe link in the e-mail. The generic versions are just as effective and much less expensive. If you need emergency medical care for a heart problem, it will be important for your health care provider to know when you last took Cialis. Tadalafil Cialis. It lasts 4 to 5 hours, or longer if you have mild to moderate ED. For oral dosage form tablets : For treatment of benign prostatic hyperplasia daily use : Adults—5 milligrams mg as a single dose, no more than once a day, taken at the same time each day.The normal dosage of Cialis for occasional use in treating ED is 10 mg taken before sexual activity. If you have side effects with the mg dose, your doctor may prescribe a 5-mg dose. If the Learn more about Cialis oral. 1. 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. Cialis can cost around $ to $ per month out of pocket, depending on the dosage you need. The first generic version of Cialis was released in October , and other manufacturers have released generic versions since then. This has increased market competition, driving prices down.