Diproxen Naproxen Polymyxin B Sulfate
MajorPolymyxin B can harm the nerves and the kidneys, and naproxen is on the leaflet's list of medicines that carry a similar risk. The leaflet says these should be avoided together with polymyxin B, whether you take them at the same time or one after the other. If you have been prescribed polymyxin B and also use naproxen for pain, tell your doctor or pharmacist before taking any naproxen.
These medicines can affect each other in a serious way. Do not start taking them together unless your doctor has said it is OK. If you already take both, do not stop either one on your own: speak to your doctor or pharmacist soon.