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"Among men undergoing radiation therapy for prostate cancer, daily use of the erectile dysfunction drug tadalafil, compared with placebo, did not prevent loss of erectile function, according to a study in the April 2 issue of JAMA."^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2014-04-medication-ed-therapy-prostate-cancer.html>