RecruitingEarly Phase 1Drug trialA Study to Determine the Preferred Dose of the Drug, Lisinopril, for Preventing Urinary Toxicity Following Radiotherapy for Prostate CancerThis study will establish the preferred dose of lisinopril in men with non-metastatic prostate cancer undergoing radiation treatment. This study will also evaluate the effect of lisinopril on urinary symptoms and the impact of lisinopril on biomarkers and their association with urinary symptoms.