At 12 months erectile function scores were better for sildenafil citrate than placebo ( p = 0.018 ) , 73 % of patients on sildenafil citrate vs 50 % on placebo had mild/no erectile dysfunction ( p = 0.024 ) and the sildenafil citrate arm had superior overall satisfaction ( p = 0.027 ) and IIEF total scores ( p = 0.043 ) .