Drug interactions
Chloramphenicol + Nafcillin
Severity: Moderate
Chloramphenicol and Nafcillin: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Bacteriostatic chloramphenicol may blunt the bactericidal action of beta-lactams such as nafcillin. This could reduce efficacy in serious infections, although clinical evidence is limited.
What this interaction means in plain words
Chloramphenicol and Nafcillin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Pharmacodynamic antagonism: beta-lactams require actively growing bacteria, which chloramphenicol suppresses.
What to do
Avoid combining where possible in serious infections such as meningitis or endocarditis. If both are needed, monitor clinical response closely.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Chloramphenicol
Frequently asked questions
Can I take Chloramphenicol with Nafcillin?
MediHelp rates the interaction as moderate. Chloramphenicol and Nafcillin can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Bacteriostatic chloramphenicol may blunt the bactericidal action of beta-lactams such as nafcillin. This could reduce efficacy in serious infections, although clinical evidence is limited.
How serious is the interaction between Chloramphenicol and Nafcillin?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining where possible in serious infections such as meningitis or endocarditis. If both are needed, monitor clinical response closely.
What other medicines interact with Chloramphenicol?
MediHelp also lists interactions of Chloramphenicol with, for example, Adagrasib, Avapritinib, Bcg vaccine live. The full list is on the Chloramphenicol page.
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