title: An open-label trial of sildenafil addition in risperidone-treated male schizophrenia patients with erectile dysfunction.
abstract: BACKGROUND
  Sexual dysfunction frequently occurs in treated and untreated patients with schizophrenia. Sildenafil is used for treatment of erectile dysfunction caused by diverse factors. The aim of our study was to evaluate its potential value, safety, and effect on compliance with anti-psychotic medications in risperidone-treated male schizophrenia patients suffering from erectile dysfunction.
  
  
  METHODS
  In a 6-week open-label trial, sildenafil was administered to 12 male schizophrenia (DSM-IV) patients, treated with risperidone and reporting erectile dysfunction. The starting dose was 25 mg with the possibility to increase the dose to 75 mg. Three patients who did not respond stopped sildenafil treatment after 3 weeks. The effect on sexual function was assessed by the International Index of Erectile Function and the Valevski-Weizman Male Sexual Function scale.
  
  
  RESULTS
  Nine (75%) of the 12 patients completed the 6-week trial, and 3 patients (25%) stopped taking sildenafil after 3 weeks due to lack of response. We observed statistically significant improvements in all sexual function domains (desire, erectile function, orgasmic function, intercourse satisfaction, and overall satisfaction) in the 9 patients who completed the trial and in most of the domains for all 12 study participants. More than half (8/12; 67%) of the patients exhibited partial or much improvement.
  
  
  CONCLUSIONS
  Sildenafil is a useful agent for the treatment of erectile dysfunction in risperidone-treated male schizophrenia patients.
authors.affiliation: Abarbanel Mental Health Center, Bat-Yam, Israel. drav1@attglobal.net
authors.forename: Alex
authors.initials: A
authors.lastname: Aviv
authors.forename: Assaf
authors.initials: A
authors.lastname: Shelef
authors.forename: Abraham
authors.initials: A
authors.lastname: Weizman
mesh_terms: D000284:Administration, Oral; D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects* / Q000627:therapeutic use; D004359:Drug Therapy, Combination; D007172:Erectile Dysfunction / Q000139:chemically induced* / Q000188:drug therapy*; D006801:Humans; D008297:Male; D010349:Patient Compliance; D017060:Patient Satisfaction; D010879:Piperazines / Q000009:adverse effects / Q000494:pharmacology* / Q000627:therapeutic use; D011687:Purines; D018967:Risperidone / Q000009:adverse effects* / Q000627:therapeutic use; D012559:Schizophrenia / Q000188:drug therapy*; D000068677:Sildenafil Citrate; D013450:Sulfones; D016896:Treatment Outcome; D014665:Vasodilator Agents / Q000494:pharmacology* / Q000627:therapeutic use
chemical_list: D014150:Antipsychotic Agents; D010879:Piperazines; D011687:Purines; D013450:Sulfones; D014665:Vasodilator Agents; D000068677:Sildenafil Citrate; D018967:Risperidone