Drug interactions
Nafcillin + Tetracycline
Severity: Moderate
Nafcillin and Tetracycline: 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 tetracyclines may blunt the activity of bactericidal beta-lactams that need actively dividing bacteria. This antagonism is mainly shown in vitro and in older clinical data in meningitis. The clinical relevance is uncertain for many infections.
What this interaction means in plain words
Nafcillin and Tetracycline 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: bacteriostatic inhibition of protein synthesis reduces bacterial growth needed for beta-lactam killing.
What to do
Avoid combining them in serious infections such as endocarditis or meningitis unless clearly justified. If used, monitor clinical response.
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 Tetracycline
- Acitretin + Tetracycline Contraindicated
- Methoxyflurane + Tetracycline Contraindicated
- Isotretinoin + Tetracycline Major
- Palovarotene + Tetracycline Major
- Strontium ranelate + Tetracycline Major
- Tetracycline + Tretinoin Major
Frequently asked questions
Can I take Nafcillin with Tetracycline?
MediHelp rates the interaction as moderate. Nafcillin and Tetracycline 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 tetracyclines may blunt the activity of bactericidal beta-lactams that need actively dividing bacteria. This antagonism is mainly shown in vitro and in older clinical data in meningitis. The clinical relevance is uncertain for many infections.
How serious is the interaction between Nafcillin and Tetracycline?
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 them in serious infections such as endocarditis or meningitis unless clearly justified. If used, monitor clinical response.
What other medicines interact with Tetracycline?
MediHelp also lists interactions of Tetracycline with, for example, Acitretin, Methoxyflurane, Isotretinoin. The full list is on the Tetracycline page.
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