Cefepime and Nafcillin interaction
Cefepime and Nafcillin: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Nafcillin label · effective 2024-12-06
WARNINGS Serious and occasionally fatal hypersensitivity (anaphylactic) reactions have been reported in patients receiving beta-lactam antibacterial drugs.
Before initiating therapy with Nafcillin, inquire about previous hypersensitivity reactions to penicillins, cephalosporins, or other allergens.
From the Cefepime (CEFEPIME HYDROCHLORIDE AND DEXTROSE) label · effective 2026-04-07
Patients with known immediate hypersensitivity reactions to cefepime or other cephalosporins, penicillins or other beta-lactam antibacterial drugs.
Hypersensitivity to Cefepime or the Cephalosporin Class of Antibacterials, Penicillins, or Other Beta-lactam Antibacterials Cefepime for Injection and Dextrose Injection is contraindicated in patients who have shown immediate hypersensitivity reactions to cefepime or the cephalosporin class of antibacterial drugs, penicillins or other beta-lactam antibacterials.
Hypersensitivity reactions : Cross-hypersensitivity may occur in up to 10% of patients with a history of penicillin allergy.
Exercise caution if this product is to be given to penicillin-sensitive patients because cross-hypersensitivity among beta-lactam antibacterials has been clearly documented and may occur in up to 10% of patients with a history of penicillin allergy.
Hypersensitivity Reactions Before therapy with Cefepime for Injection and Dextrose Injection is instituted, careful inquiry should be made to determine whether the patient has had previous immediate hypersensitivity reactions to cefepime, cephalosporins, penicillins, or other drugs.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.