Cloxpen Cloxacillin Methotrexate
MajorPenicillins reduce renal clearance of methotrexate, increasing its toxicity.
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.
Clinical management: Monitor methotrexate levels and blood counts.