title: Serum penicillin levels produced by semi-synthetic penicillins.
mesh_terms: D006801:Humans; D007273:Injections, Intramuscular; D008712:Methicillin / Q000097:blood*; D010068:Oxacillin / Q000097:blood*
chemical_list: D008712:Methicillin; D010068:Oxacillin