EM Erythromycin Fentanyl Citrate
MajorErythromycin can raise the level of fentanyl in your blood. That can make fentanyl's side effects stronger or last longer. It may also slow your breathing to a dangerous, even life-threatening, level. If you have been prescribed both, do not start or stop either one without asking your doctor or pharmacist first.
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.