Drug interactions
Magnesium sulfate + Minocycline
Severity: Moderate
Magnesium sulfate and Minocycline: 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 magnesium sulfate, such as in laxative use, may bind minocycline in the gut and reduce its absorption. Intravenous magnesium sulfate is not expected to interact this way.
What this interaction means in plain words
Magnesium sulfate and Minocycline 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 minocycline by magnesium cations in the gastrointestinal tract reduces absorption.
What to do
Separate oral minocycline from oral magnesium sulfate by at least 2 hours before or 4 hours after. No separation is needed with intravenous magnesium.
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 Minocycline
- Acitretin + Minocycline Contraindicated
- Isotretinoin + Minocycline Contraindicated
- Cholera vaccine + Minocycline Major
- Methoxyflurane + Minocycline Major
- Minocycline + Palovarotene Major
- Minocycline + Pexidartinib Major
Frequently asked questions
Can I take Magnesium sulfate with Minocycline?
MediHelp rates the interaction as moderate. Magnesium sulfate and Minocycline 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 magnesium sulfate, such as in laxative use, may bind minocycline in the gut and reduce its absorption. Intravenous magnesium sulfate is not expected to interact this way.
How serious is the interaction between Magnesium sulfate and Minocycline?
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 minocycline from oral magnesium sulfate by at least 2 hours before or 4 hours after. No separation is needed with intravenous magnesium.
What other medicines interact with Minocycline?
MediHelp also lists interactions of Minocycline with, for example, Acitretin, Isotretinoin, Cholera vaccine. The full list is on the Minocycline page.
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