Drug interactions
Calcium gluconate + Doxycycline
Severity: Moderate
Calcium gluconate and Doxycycline: 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 gluconate can chelate doxycycline in the gut and reduce its absorption, though the calcium content per dose is relatively low. Intravenous calcium gluconate does not cause this interaction.
What this interaction means in plain words
Calcium gluconate and Doxycycline 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 gluconate belongs to Gastrointestinal Tract; Doxycycline belongs to Anti Bacterial.
Why it happens
Chelation of doxycycline by calcium cations in the gastrointestinal tract reduces absorption.
What to do
For oral use, separate doxycycline from calcium gluconate by at least 2 hours before or 4 hours after. No separation is needed with IV calcium.
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 Calcium gluconate
- Calcium gluconate + Ceftriaxone Contraindicated
- Calcium gluconate + Digoxin Major
- Alendronate + Calcium gluconate Moderate
- Amlodipine-atorvastatin + Calcium gluconate Moderate
- Amlodipine-hydrochlorothiazide-valsartan + Calcium gluconate Moderate
- Amlodipine-olmesartan-hydrochlorothiazide + Calcium gluconate Moderate
Frequently asked questions
Can I take Calcium gluconate with Doxycycline?
MediHelp rates the interaction as moderate. Calcium gluconate and Doxycycline 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 gluconate can chelate doxycycline in the gut and reduce its absorption, though the calcium content per dose is relatively low. Intravenous calcium gluconate does not cause this interaction.
How serious is the interaction between Calcium gluconate and Doxycycline?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: For oral use, separate doxycycline from calcium gluconate by at least 2 hours before or 4 hours after. No separation is needed with IV calcium.
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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