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. There were highly statistically significant improvements on the two principal IIEF questions frequency of successful penetration during sexual activity and maintenance of erections after penetration on sildenafil tablets compared to placebo. In healthy male volunteers, there was no evidence of a clinically significant effect of azithromycin mg daily for 3 days on the systemic exposure of sildenafil or its major circulating metabolite. During 3 to 6 months of double-blind treatment or longer-term 1 year , open-label studies, few patients withdrew from active treatment for any reason, including lack of effectiveness. These effects on the metabolite are not expected to be of clinical consequence. Sildenafil tablets demonstrated statistically significant improvement compared to placebo in all 21 studies. · SC Pill Identification (Blue/Oval) SC Pill is identified as a blue, oval pill with an “SC” on one side and a ″ imprint on the other. This pill contains Sildenafil . Pill Identifier results for “S “. Search by imprint, shape, color or drug name.