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Table 2 At least 40% of attempts at sexual intercourse successful

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 benefit (95% CI) NNT (95% CI)
25 3 122/312 (39) 70/426 (16) 2.6 (2.0 to 3.3) 4.4 (3.4 to 6.2)
50 5 269/511 (53) 102/607 (17) 3.3 (2.7 to 4.0) 2.8 (2.4 to 3.3)
100 5 272/506 (54) 102/607 (17) 3.3 (2.7 to 4.1) 2.7 (2.4 to 3.2)
200 2 106/191 (55) 32/181 (18) 3.1 (2.2 to 4.3) 2.6 (2.1 to 3.5)
Dose optimised 3 227/379 (60) 70/376 (19) 3.2 (2.6 to 4.0) 2.4 (2.1 to 2.9)