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In response to numerous inquiries, the U.S. Food and Drug Administration answers your questions online concerning Viagra, a treatment approved for men who have difficulty having and maintaining an ere... Details >

Center for Drug Evaluation and Research, U.S. Food and Drug Administration

Also available in: Spanish 

Impotence is a consistent inability to sustain an erection sufficient for sexual intercourse. This fact sheet focuses on impotence defined as erectile dysfunction.... Details >

National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health