Ask your doc about fentanyl, as it is only a mu receptor agonist, without near the urinary retention and consipation and depression effects of methadone (or oxy). You would probably have to start with over 100mg patches, possibly 150+ given what you're on. Rarely: Severe stool impaction can cause urinary retention especially in chidren. A large hard bolus of stool can compress thethra ; even push up the bladder neck. Can someone explain how oxycodone can cause urine retention? Thanks Urinary retention is characterised by poor urinary stream with intermittent flow, straining, a sense of incomplete voiding, and hesitancy (a delay between trying to urinate and the flow actually beginning). Narcotic analgesics (Includes Percocet) ↔ urinary retention. Moderate Potential Hazard, Moderate plausibility. Applies to: Urinary Retention. Narcotic (opioid) analgesic agents may inhibit the urinary voiding reflex and increase the tone of the vesical sphincter in the bladder. Acute urinary retention requiring catheterization may occur, particularly in patients with prostatic hypertrophy. Summary. Urinary retention is found among people who take Percocet, especially for people who are female, 60+ old , have been taking the drug for 1 month, also take medication Zometa, and have Metastases to bone. Urinary Retention is a known side effect of Oxycodone. Complete analysis from patient reviews and trusted online health resources, including first-hand experiences. Complete analysis from patient reviews and trusted online health resources, including first-hand experiences. Summary. Urinary retention is found among people who take Oxycodone, especially for people who are male, 60+ old , have been taking the drug for 1 month, also take medication Oxycontin, and have Multiple myeloma. I think Mary gave some great advice with regards to urinary retention. I am on Morphine ER and percocet and I drink a ton of water and that has seemed to help. Interstitial nephritis, papillary necrosis, proteinuria, renal insufficiency and failure, urinary retention Drug Abuse And Dependence PERCOCET tablets are a Schedule II controlled substance.