Gento Gentamicin Polymyxin B Sulfate
MajorPolymyxin B and gentamicin can each harm the nerves and the kidneys. Taking them together, or one soon after the other, can add to that risk. The leaflet says this combination should be avoided, so don't use them together unless your doctor has specifically told you to.
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.