GTP is the abbreviation for guanosine triphosphate. When GTP is broken down by an enzyme called guanylate cyclase, GTP forms cGMP or cyclic guanosine monophosphate which produces an erection. Prostate cancer treatments may result in the inability to produce and maintain an erection satisfactory sexual intercourse, however, prostate cancer treatments are continually advancing in technique and technology that may result in fewer and less severe side effects.
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