<unk>  is an antibiotic useful for the treatment of a number of bacterial infections. This includes impetigo, cellulitis, pneumonia, septic arthritis, and otitis externa. It is not effective for methicillin-resistant Staphylococcus aureus (MRSA). It is used by mouth and by injection. Side effects include nausea, diarrhea, and allergic reactions including anaphylaxis. Clostridium difficile diarrhea may also occur. It is not recommended in people who have previously had a penicillin allergy. Use during pregnancy appears to be relatively safe.<unk>  is in the penicillin family of medications.<unk>  was patented in 1960 and approved for medical use in 1965. It is on the World Health Organization's List of Essential Medicines. It is not commercially available in the United States.
Cloxacillin
Piperacillin
Dicloxacillin
Flucloxacillin
Cefazolin
Resistin
Ampicillin
Vancomycin