Drug interactions
Magnesium supplement + Tetracycline
Severity: Moderate
Magnesium supplement 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
Magnesium-containing supplements bind tetracycline in the gut and form poorly soluble chelates. This markedly reduces tetracycline absorption and can lead to subtherapeutic levels and treatment failure.
What this interaction means in plain words
Magnesium supplement 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
Chelation of tetracycline by magnesium divalent cations in the gastrointestinal tract, reducing absorption.
What to do
Separate doses, giving tetracycline at least 2 hours before or 4 hours after the magnesium product. Consider an alternative timing schedule or non-chelating antibiotic if separation is not feasible.
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 Magnesium supplement with Tetracycline?
MediHelp rates the interaction as moderate. Magnesium supplement 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. Magnesium-containing supplements bind tetracycline in the gut and form poorly soluble chelates. This markedly reduces tetracycline absorption and can lead to subtherapeutic levels and treatment failure.
How serious is the interaction between Magnesium supplement 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: Separate doses, giving tetracycline at least 2 hours before or 4 hours after the magnesium product. Consider an alternative timing schedule or non-chelating antibiotic if separation is not feasible.
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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