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Incidence of adverse events following treatment with sildenafil or placebo.
| Sildenafil | Placebo | |
|---|---|---|
| All cause treatment-emergent adverse events (withdrawals) | 14/16 (0) | 7/17 (1)* |
| Treatment-related adverse events | 11/16 | 3/17 |
| Flushing | 6 | 1 |
| Headache | 5 | 1 |
| Dizziness | 3 | 1 |
| Abnormal vision† | 3 | 0 |
This subject discontinued because of severe back pain related to a slipped disc
each case was a mild and transient disturbance in colour discrimination.
