Drug interactions
Calcium + Minocycline
Severity: Moderate
Calcium 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 calcium can bind minocycline in the gut and decrease its absorption, potentially reducing antibacterial effect. The interaction is relevant only for oral co-administration.
What this interaction means in plain words
Calcium 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.
Calcium belongs to Gastrointestinal Tract; Minocycline belongs to Anti Bacterial.
Why it happens
Calcium cations chelate minocycline in the gastrointestinal lumen, forming insoluble complexes that are poorly absorbed.
What to do
Separate minocycline from oral calcium products by at least 2 hours, giving the antibiotic first. Watch for reduced clinical response to therapy.
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 Calcium
- Calcium + Ceftriaxone Contraindicated
- Acalabrutinib + Calcium Moderate
- Alendronate + Calcium Moderate
- Atazanavir + Calcium Moderate
- Baloxavir marboxil + Calcium Moderate
- Bendroflumethiazide + Calcium Moderate
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 Calcium with Minocycline?
MediHelp rates the interaction as moderate. Calcium 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 calcium can bind minocycline in the gut and decrease its absorption, potentially reducing antibacterial effect. The interaction is relevant only for oral co-administration.
How serious is the interaction between Calcium 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 minocycline from oral calcium products by at least 2 hours, giving the antibiotic first. Watch for reduced clinical response to therapy.
What other medicines interact with Calcium?
MediHelp also lists interactions of Calcium with, for example, Ceftriaxone, Acalabrutinib, Alendronate. The full list is on the Calcium page.
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