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Viagra Approved In Japan For Erectile Dysfunction NEW YORK, NY -- Jan. 25, 1999 -- The Japanese Minister of Health and Welfare (MHW) has given final approval for Pfizer Inc.’s Viagra (sildenafil citrate), an oral therapy for erectile dysfunction. Viagra received an expedited review by the MHW and will become available in about one month, Pfizer said. The first treatment for erectile dysfunction approved by the MHW, Viagra was cleared for marketing after the government concluded that there is no problem on safety and its effectiveness, an MHW official said publicly on Monday. Viagra is the first in a new class of medications known as phosphodiesterase type 5 inhibitors that improve blood flow to the penis. In clinical trials, Viagra has been demonstrated to restore sexual function in most patients. Erectile dysfunction is defined as the consistent inability to achieve and/or maintain a erection sufficient for satisfactory sexual activity. The prevalence of ED increases with age. Related Links: Viagra, Pfizer Inc. E-mail this page to a friend or colleague! To print, use this version