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Buying CialisErectile Dysfunction and CialisWhat is Erectile DysfunctionIn 1992, the National Institutes of Health defined erectile dysfunction as the inability to attain or sustain an erection adequate for satisfactory sexual intercourse. In short, Erectile Dysfunction (ED) is the persistent or repeated inability for at least 3 months to attain, and/or maintain an erection sufficient for satisfactory sexual performance. | ||||