I dont know if it would cause respiratory distress but morphine is just pure codeine. If youre note allergic to codeine, you should be okay with morphine. However, again, I would stress that there is no way to know what this would do to your respiratory system. You do not have to be allergic to morphine for it to cause complications or reactions. You should speak with your doctor or pharmacist.
ask a doctor, u can only get morphine from them anyway. i wouldnt suggest jus trying it seein as you're highly allergic when it comes to painkillers
If you are asthmatic or any other respiratory disorders, then morphine is a bad idea. It's better if you see a physician who would recommend the right pain killer.