Drug interactions
Dicloxacillin + Doxycycline
Severity: Moderate
Dicloxacillin and Doxycycline: 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 reduce the bactericidal effect of penicillins such as dicloxacillin. Clinical significance is uncertain, but treatment failure is a concern in serious infections.
What this interaction means in plain words
Dicloxacillin and Doxycycline 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.
Dicloxacillin belongs to Anti Bacterial; Doxycycline belongs to Anti Bacterial.
Why it happens
Tetracycline-induced inhibition of bacterial protein synthesis halts growth, reducing the killing effect of cell-wall-active penicillins.
What to do
Avoid combining in serious infections requiring bactericidal therapy. 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 Dicloxacillin
- Dicloxacillin + Phenindione Major
- Atogepant + Dicloxacillin Moderate
- Axitinib + Dicloxacillin Moderate
- Bcg vaccine live + Dicloxacillin Moderate
- Cholera vaccine + Dicloxacillin Moderate
- Demeclocycline + Dicloxacillin Moderate
Other interactions of Doxycycline
- Acitretin + Doxycycline Contraindicated
- Aminolevulinic acid + Doxycycline Major
- Cholera vaccine + Doxycycline Major
- Doxycycline + Isotretinoin Major
- Doxycycline + Methoxyflurane Major
- Doxycycline + Microbiota Major
Frequently asked questions
Can I take Dicloxacillin with Doxycycline?
MediHelp rates the interaction as moderate. Dicloxacillin and Doxycycline 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 reduce the bactericidal effect of penicillins such as dicloxacillin. Clinical significance is uncertain, but treatment failure is a concern in serious infections.
How serious is the interaction between Dicloxacillin and Doxycycline?
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 in serious infections requiring bactericidal therapy. If both are needed, monitor clinical response closely.
What other medicines interact with Dicloxacillin?
MediHelp also lists interactions of Dicloxacillin with, for example, Phenindione, Atogepant, Axitinib. The full list is on the Dicloxacillin page.
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