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Objective: This open-label study investigated the efficacy of sildenafil citrate at 12hours postdose among prior treatment responders.Patients and Methods: Eight 100-mg doses of sildenafil were provided to 40 eligible patients with erectile dysfunction (ED), who were to record the results of each sexual attempt in a patient diary. Each patient was instructed to make a sexual attempt at 1 and 12hours...
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