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As with Cialis, some people may experience a painful, prolonged erection that lasts longer than four hours. They also may experience itching while urinating and/or a rash. Doing so increases the risk of adverse effects and can lead to serious complications.

If the interaction was not significant (i.e., if P ≥ 0.10), then it was removed from the model and the between-treatment-group P value was obtained from the reduced model. Patients were also seen within 1–2 weeks after the 12-week end point for appropriate follow-up of adverse events. One coprimary efficacy variable consisted of the change in mean erectile function domain score from baseline to end point. There is a lack of data on the absolute bioavailability data of tadalafil (Porst et al., 2003). Tadalafil is well-absorbed after oral administration (Porst, 2002)