Drug interactions
Tetracycline + Zinc
Severity: Moderate
Tetracycline 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
Zinc salts bind tetracycline in the gut and form poorly absorbed complexes. This lowers tetracycline concentrations and may reduce antibacterial efficacy.
What this interaction means in plain words
Tetracycline 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.
Tetracycline belongs to Anti Bacterial; Zinc belongs to Gastrointestinal Tract.
Why it happens
Chelation of tetracycline by zinc cations in the gastrointestinal tract, reducing absorption.
What to do
Separate oral tetracycline and zinc by at least 2 to 3 hours, giving tetracycline first where possible.
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
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 Tetracycline with Zinc?
MediHelp rates the interaction as moderate. Tetracycline 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. Zinc salts bind tetracycline in the gut and form poorly absorbed complexes. This lowers tetracycline concentrations and may reduce antibacterial efficacy.
How serious is the interaction between Tetracycline 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 oral tetracycline and zinc by at least 2 to 3 hours, giving tetracycline first where possible.
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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