Use of Silodosin to Treat Moderate to Severe Abacterial Chronic Prostatitis/Chronic Pelvic Pain Syndrome.

Inclusion Criteria: * Male, at least 18 years of age * Has a total NIH-CPSI total score of 15 * Has a NIH-CPSI pain score of 8 * Has had pain in the pelvic region for at least 3 months prior to screening Exclusion Criteria: * Has previously participated in a Watson study with silodosin * Has previously received α-blocked therapy for chronic prostatitis/chronic pelvic pain syndrome or is currently receiving α-blocked therapy for any condition * Has experience ≥2 urinary tract infections within the previous 12 months * Has any medical condition that in the opinion of the investigator precludes safe participation in the study * Has any medical condition that could confound the efficacy evaluation * Is receiving ketoconazole, or other known potent inhibitors of cytochrome P450 3A4 or any medication in the opinion of the investigator that precludes safe participation in the study * Is receiving any medication that in the opinion of the investigator that could confound the efficacy evaluation * Has participated in a study involving the administration of an investigational agent within the past 30 days