That’s not to say there aren’t just as many illegitimate sites. This allows the smooth muscles in the penis to relax and fill with blood. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection. We will ask about your experience with generic Cialis as part of your visit. Most men start with and respond well to the 10 mg tadalafil dose.Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded Viagra: $90 per 25 mg, 50 mg, or mg pill; Generic Cialis (tadalafil): $11 per 5 mg pill, $44 per 10 mg or 20 mg pill; Generic Cialis Daily (tadalafil): $8 per mg or 5 mg pill; Branded Cialis: $10 per 5 mg pill, $80 per 10 mg or 20 mg pill. Here’s a breakdown of what you can expect to pay for Cialis and generic Cialis: Brand-name Cialis. $ for a one-month supply of 5-mg oral tablet; Generic Cialis (tadalafil). Roman sells the following versions of Cialis: Generic: available in tablets of 5, 10, and 20 milligrams (mg), starting from $11; Daily Generic: available in doses of and 5 mg at $8.