Symptoms When Being Switched To A Different Medication?

You could be going through withdrawl symptoms from the oxy. If they persist longer than a few days, you should follow up with your MD. As for the morphine...both oxy and morphine can depress the respiratory system. You were already taking a high dose of oxy and you were fine, so wouldn't over-think the morphine issue. If you do experience symptoms that concern you, you should just make an appt w/ your doctor to have your questions answered. You also may consider taking an over the counter stool softener such as docusate sodium to control your constipation risk, talk to your pharmacist to make sure there are no contra-indications or interactions with the other meds you are taking.