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Table 1 At least 60% 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 88/312 (28) 43/426 (10) 3.0 (2.1 to 4.2) 5.5 (4.2 to 8.1)
50 5 216/511 (42) 62/607 (10) 4.3 (3.3 to 5.6) 3.1 (2.7 to 3.7)
100 5 223/506 (44) 62/607 (10) 4.4 (3.4 to 5.8) 3.0 (2.6 to 3.5)
200 2 93/191 (49) 19/181 (10) 4.5 (2.9 to 7.1) 2.6 (2.2 to 3.4)
Dose optimised 3 183/379 (48) 43/376 (11) 4.2 (3.1 to 5.6) 2.7 (2.3 to 3.2)