Drug interactions
Doxycycline + Tripotassium dicitratobismuthate
Severity: Moderate
Doxycycline and Tripotassium dicitratobismuthate: 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
Bismuth salts can bind oral doxycycline in the gut and lower its absorption, risking subtherapeutic antibiotic levels. This is relevant in bismuth-containing Helicobacter pylori regimens that include a tetracycline. Reduced absorption may contribute to treatment failure.
What this interaction means in plain words
Doxycycline and Tripotassium dicitratobismuthate 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 doxycycline by bismuth in the gastrointestinal tract reduces its absorption.
What to do
Separate oral doses by at least 2 to 3 hours where the regimen allows. Where they are intentionally given together, as in quadruple therapy, follow the validated regimen and confirm eradication.
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
Frequently asked questions
Can I take Doxycycline with Tripotassium dicitratobismuthate?
MediHelp rates the interaction as moderate. Doxycycline and Tripotassium dicitratobismuthate 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. Bismuth salts can bind oral doxycycline in the gut and lower its absorption, risking subtherapeutic antibiotic levels. This is relevant in bismuth-containing Helicobacter pylori regimens that include a tetracycline. Reduced absorption may contribute to treatment failure.
How serious is the interaction between Doxycycline and Tripotassium dicitratobismuthate?
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 doses by at least 2 to 3 hours where the regimen allows. Where they are intentionally given together, as in quadruple therapy, follow the validated regimen and confirm eradication.
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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