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  • Title: A randomized, double-blind, placebo-controlled, cross-over study to assess the efficacy of tadalafil (Cialis) in the treatment of erectile dysfunction following three-dimensional conformal external-beam radiotherapy for prostatic carcinoma.
    Author: Incrocci L, Slagter C, Slob AK, Hop WC.
    Journal: Int J Radiat Oncol Biol Phys; 2006 Oct 01; 66(2):439-44. PubMed ID: 16965992.
    Abstract:
    PURPOSE: Erectile dysfunction after three-dimensional conformal external-beam radiotherapy (3DCRT) for prostatic carcinoma is reported in as many as 64% of those patients. The purpose of this study was to determine the efficacy of the oral drug tadalafil (Cialis) in patients with erectile dysfunction after radiotherapy for prostatic carcinoma. METHODS AND MATERIALS: Patients (N=358) who completed radiotherapy at least 12 months before the study were approached by mail. All patients had been treated by 3DCRT; 60 patients were included and entered a double-blind, placebo-controlled, cross-over study lasting 12 weeks. They received 20 mg of tadalafil or placebo for 6 weeks. Drug or placebo was taken on demand at patient's discretion, with no restrictions regarding the consumption of alcohol or food, at least once a week and no more than once daily. At 6 weeks patients crossed over to the alternative treatment. Data were collected using the Sexual Encounter Profile (SEP) and the International Index of Erectile Function (IIEF) questionnaires. Side effects were also recorded. RESULTS: Mean age at study entry was 69 years. All patients completed the study. For almost all questions of the IIEF questionnaire there was a significant increase in mean scores from baseline with tadalafil, but not with placebo. Sixty-seven percent of the patients reported an improvement of erectile function with tadalafil (placebo: 20%), and 48% reported successful intercourse with tadalafil (placebo: 9%) (p<0.0001). Side effects were mild or moderate. CONCLUSIONS: Tadalafil is an effective treatment for erectile dysfunction after 3DCRT for prostatic carcinoma with successful intercourse reported in almost 50% of the patients, and it is well tolerated.
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