The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. You need to be sexually excited for it to work. In vivo studies: No significant interactions were shown with tolbutamide mg or warfarin 40 mg , both of which are metabolized by CYP2C9. The primary endpoint was time to limiting angina in the evaluable cohort. It is eliminated predominantly by hepatic metabolism mainly CYP3A4 and is converted to an active metabolite with properties similar to the parent, sildenafil. Efficacy Results from Controlled Clinical Studies The effect on one of the major end points, maintenance of erections after penetration, is shown in Figure 6, for the pooled results of 5 fixed-dose, dose-response studies of greater than one month duration, showing response according to baseline function.Best prices for generic viagra on the Internet! The safest way is to ask your physician to try an alternate prescription. Sildenafil 50mg Tablets are designed for men who are suffering from Erectile Dysfunction problems. x 1. Crimson red joystick $ x 4. Carbon black joystick $ x 1. Magimons black framed print $ How does this compare with the cost of other strengths ( mg, 5 mg, 10 mg)? Cialis comes in several strengths: milligrams (mg), 5mg, 10 mg, and 20 mg. The Cialis cost per pill and daily cost. Find the best sildenafil citrate or viagra prices near you now with our cost comparison tool and start saving today.