Treatment of Men with Erectile Dysfunction with Transurethral Alprostadil
Harin Padma-Nathan, M.D., Wayne J.G. Hellstrom, M.D., Fran E. Kaiser, M.D., Richard F. Labasky, M.D., Tom F. Lue, M.D., Wolfram E. Nolten, M.D., Paul C. Norwood, M.D., Craig A. Peterson, M.S., Ridwan Shabsigh, M.D., Peter Y. Tam, B.S., Virgil A. Place, M.D., Neil Gesundheit, M.D., M.P.H., Christy Cowley, B.S, Kerry J. Nemo, Alfred P. Spivack, M.D., Darby E. Stephens, B.S., Leslie K. Todd, B.A., for The Medicated Urethral System for Erection (MUSE) Study Group
Background Erectile dysfunction in men is common. We evaluateda system by which alprostadil (prostaglandin E1) is deliveredtransurethrally to treat this disorder.
Methods Alprostadil was delivered transurethrally in a double-blind,placebo-controlled study of 1511 men, 27 to 88 years of age,who had chronic erectile dysfunction from various organic causes.The men were first tested in the clinic with up to four dosesof the drug (125, 250, 500, and 1000 µg); those who hadsufficient responses were randomly assigned to treatment witheither the effective dose of alprostadil or placebo for threemonths at home.
Results During in-clinic testing, 996 men (65.9 percent) haderections sufficient for intercourse. Of these men, 961 reportedthe results of at least one home treatment; 299 of the 461 treatedwith alprostadil (64.9 percent) had intercourse successfullyat least once, as compared with 93 of the 500 who received placebo(18.6 percent, P<0.001). On average, 7 of 10 alprostadiladministrations were followed by intercourse in men responsiveto treatment. The efficacy of alprostadil was similar regardlessof age or the cause of erectile dysfunction, including vasculardisease, diabetes, surgery, and trauma (P<0.001 for all comparisonswith placebo). The most common side effect was mild penile pain,which occurred after 10.8 percent of alprostadil treatments,but the pain rarely resulted in refusal to continue in the study.Hypotension occurred in the clinic in 3.3 percent of men receivingalprostadil. Hypotension-related symptoms were uncommon at home.No men had priapism or penile fibrosis.
Conclusions In men with erectile dysfunction, transurethralalprostadil therapy resulted in erections in the clinic andin intercourse at home.
Source Information
From the Department of Urology, University of Southern California, Los Angeles, and the Male Clinic, Santa Monica, Calif. (H.P.-N.); the Department of Urology, Tulane University Medical Center, New Orleans (W.J.G.H.); the Division of Geriatric Medicine, St. Louis University School of Medicine, St. Louis (F.E.K.); the Division of Urology, University of Utah, Salt Lake City (R.F.L.); the Department of Urology, University of California, San Francisco (T.F.L.); the Section of Endocrinology, University of Wisconsin, Madison (W.E.N.); the Peachwood Medical Group, Clovis, Calif. (P.C.N.); the Department of Clinical Research, Vivus, Inc., Menlo Park, Calif. (C.A.P., P.Y.T., V.A.P., N.G.); and the Department of Urology, ColumbiaPresbyterian Hospital, New York (R.S.). Other authors were Christy Cowley, B.S., Kerry J. Nemo, Alfred P. Spivack, M.D., Darby E. Stephens, B.S., and Leslie K. Todd, B.A. all from Vivus, Inc., Menlo Park, Calif.Presented in part at the annual meeting of the American Geriatric Society, Chicago, May 15, 1996, and at the annual meeting of the American Urologic Association, Orlando, Fla., May 49, 1996.
Address reprint requests to Dr. Gesundheit at Vivus, 545 Middlefield Rd., Suite 200, Menlo Park, CA 94025.
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