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Onset and duration of action of sildenafil for the treatment of erectileStudy II: The duration of grade 3 (hard enough for penetration) and grade 4 (fully hard) erections, determined by self-assessment during 60 min of VSS starting 2 and 4 h after sildenafil (100 mg) or placebo dosing, was measured in 16 patients. viagra 100 mg duration meaning

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