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Relationship of dosing to time and success of intercourse for tadalafil 20 mg and placebo in four trials
| Time after dose (hours) | ||||
| Outcome | <0.5 to 4 | >4 to 12 | >12 to 24 | >24 to 36 |
| Percent of total attempts at intercourse | ||||
| Placebo | 75 | 15 | 9.0 | 1.7 |
| Tadalafil 20 mg | 61 | 23 | 12 | 3.7 |
| Percent of successful attempts at intercourse | ||||
| Placebo | 74 | 15 | 8.4 | 3.3 |
| Tadalafil 20 mg | 60 | 23 | 13 | 4 |
| Percent of attempts that were successful | ||||
| Placebo | 26 | 26 | 24 | 50 |
| Tadalafil 20 mg | 65 | 68 | 72 | 74 |
