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Table 6 All cause discontinuations

From: Sildenafil (Viagra) for male erectile dysfunction: a meta-analysis of clinical trial reports

   Number (%) with outcome  
Dosing (mg) Number of trials Sildenafil Placebo Relative risk (95% CI) NNH (95% CI)
25 3 32/312 (10) 63/426 (15) 0.75 (0.50 to 1.11)  
50 5 36/508 (7) 86/607 (14) 0.52 (0.36 to 0.76) -14 (-9 to -28)
100 5 47/506 (9) 86/607 (14) 0.67 (0.47 to 0.95) -20 (-12 to -89)
200 2 18/191 (9) 23/181 (13) 0.76 (0.43 to 1.35)  
Dose optimised 5 52/517 (10) 104/524 (20) 0.50 (0.37 to 0.67) -10 (-7 to -18)