Cialis (tadalafil) is an oral, prescription medication used to treat erectile dysfunction (ED). It also manages symptoms of an enlarged prostate. Cialis and its generics have two possible dosage options. You can take the medication as needed before sex or consistently every day. Cialis is available as a lower-cost generic. GoodRx can help you save over 90% off the average retail price at. Find patient medical information for Tadalafil (Cialis, Adcirca, and others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Cialis (tadalafil) increase increases blood flow to a certain area of the body and is used to treat erectile dysfunction (impotence). Includes Cialis side effects, interactions and indications. Tadalafil increases blood flow to particular areas of the body and is used to treat erectile dysfunction. Learn about side effects, interactions and indications. If you take tadalafil for pulmonary arterial hypertension, do not take Cialis® or other PDE5 inhibitors, including sildenafil (Revatio® or Viagra®) or vardenafil (Levitra®). Cialis® also contains tadalafil. If you take too much tadalafil or take it together with these medicines, the chance for side effects will be higher. Wondering how much Cialis costs? learn the price difference between brand-name Cialis and generic tadalafil, insurance coverage, and savings coupons. Tadalafil is a generic drug prescribed for erectile dysfunction and other conditions. Learn about the drug’s dosages, form, strengths, and more. The difference is purely economic. Brand-name Cialis runs about $55.26 per pill at the 20 mg strength. Generic tadalafil at the 5 mg daily dose costs roughly $0.48 to $0.65 per pill. That price gap exists because multiple manufacturers now produce the generic, creating competition that drives costs down. Tadalafil oral tablet is available as the brand-name drugs Cialis and Adcirca. It’s also available in a generic form. Generic drugs usually cost less than the brand-name version. Is generic Cialis as effective as brand name? Here's what to know about tadalafil, including who makes it and how it works.