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This is Dr. David
morphine can cause constipation and hard stools which can put pressure on your prostate gland which can cause you difficulty with urination.
opiates like morphine can decreases the sensation of bladder fullness by partially inhibiting the parasympathetic nerves that innervate the bladder
also opiates have been shown to increase the sphincter tone of the urinary bladder via sympathetic over-stimulation, resulting in increased bladder outlet resistance
you may need something else to help fight your pain
or you may need to use a straight catheter to get urine out of your bladder if you need to stay on morphine
you need to see a urologist about this
have you had a urinary catheter before?
there are also medications like flomax and hytrin which can help you urinate and medications which can help shrink your prostate over time like proscar and avodart which can help as well
let me know if you have other questions.