Post Operative Urinary Retention (POUR) Following Thoracic Oncological Surgery

This is a feasibility study looking at whether the use of Tamsulosin could lower the high incidence of postoperative urinary retention (POUR) in older men who undergo an oncological thoracic surgical procedure for suspected or confirmed cancer. In addition, the study will try to identify the time of resumption of presurgical urinary function post Tamsulosin administration.

Inclusion Criteria: * Males * ≥55 years old * Planned thoracic oncological surgical procedure of a video assisted oncological surgical procedure for suspected or confirmed cancer. * Surgery scheduled more than 7 days from the time of consent Exclusion Criteria: * Using Tamsulosin already * Known allergy to Tamsulosin or sulfa drugs * Current use of Boceprevir * Resting systolic blood pressure \20mm Hg systolic and/or 10mm Hg diastolic pressure from sitting to standing (after 2 minutes of standing) as measured at the time of consent * Known history of hypotension * Known diagnosis of congestive heart failure (CHF) and valvular heart disease * History of prior prostate surgery (prostatectomy, trans-urethral resection)