Obesity Additionally, certain risk factors increase the risk of ED, such as smoking , lack of exercise, and drug or alcohol use. In trials investigating Cialis, the majority of participants receiving the drug experienced a significant improvement in ED and maintained an erection. BPH occurs when the prostate and the surrounding tissues become enlarged. Tadalafil is its active ingredient and is available as a generic drug. Awareness regarding counterfeit products should be spread to the consumers.With Goodrx, the generic version of Cialis 20 mg (tadalafil) is about $9 for 10 tablets. The brand version is about $ $ (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. Dosage range: mg to 5 mg. Frequency: once daily, regardless of the timing of sexual activity. Cialis’s recommended dosage when it’s taken as needed for ED is as follows. Dosage range: 5 mg to 20 mg. Frequency: one dose at least 30 minutes before sexual activity, with a maximum of one dose per day*.