Drug interactions
Doxycycline + Zinc
Severity: Moderate
Doxycycline and Zinc: 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
Oral zinc salts can bind doxycycline in the gut and reduce its absorption. This may lower antibiotic concentrations and risk reduced efficacy, although doxycycline is less affected than older tetracyclines.
What this interaction means in plain words
Doxycycline and Zinc 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.
Doxycycline belongs to Anti Bacterial; Zinc belongs to Gastrointestinal Tract.
Why it happens
Chelation of doxycycline by zinc cations in the gastrointestinal tract reduces absorption.
What to do
Separate doses by at least 2 hours, giving doxycycline first where possible. Consider this especially for serious infections.
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 Doxycycline
- Acitretin + Doxycycline Contraindicated
- Aminolevulinic acid + Doxycycline Major
- Cholera vaccine + Doxycycline Major
- Doxycycline + Isotretinoin Major
- Doxycycline + Methoxyflurane Major
- Doxycycline + Microbiota Major
Other interactions of Zinc
- Alendronate + Zinc Moderate
- Baloxavir marboxil + Zinc Moderate
- Cefalexin + Zinc Moderate
- Ciprofloxacin + Zinc Moderate
- Delafloxacin + Zinc Moderate
- Dolutegravir + Zinc Moderate
Frequently asked questions
Can I take Doxycycline with Zinc?
MediHelp rates the interaction as moderate. Doxycycline and Zinc 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. Oral zinc salts can bind doxycycline in the gut and reduce its absorption. This may lower antibiotic concentrations and risk reduced efficacy, although doxycycline is less affected than older tetracyclines.
How serious is the interaction between Doxycycline and Zinc?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Separate doses by at least 2 hours, giving doxycycline first where possible. Consider this especially for serious infections.
What other medicines interact with Doxycycline?
MediHelp also lists interactions of Doxycycline with, for example, Acitretin, Aminolevulinic acid, Cholera vaccine. The full list is on the Doxycycline page.
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