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Table 4 Treatment related adverse events

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 71/312 (23) 33/426 (8) 2.8 (1.9 to 4.2) 6.7 (4.9 to 10)
50 5 190/508 (37) 59/607 (10) 3.7 (2.8 to 4.8) 3.6 (3.1 to 4.4)
100 5 260/506 (51) 59/607 (10) 5.0 (3.9 to 6.5) 2.4 (2.2 to 2.7)
200 2 137/191 (72) 26/181 (14) 5.0 (3.5 to 7.2) 1.7 (1.5 to 2.0)
Dose optimised 5 155/517 (30) 60/524 (11) 2.6 (2.0 to 3.4) 5.4 (4.3 to 7.3)