Drug interactions
Doxycycline + Typhoid vaccine live
Severity: Major
Doxycycline and Typhoid vaccine live: major 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 live attenuated typhoid vaccine (Ty21a) contains viable bacteria that antibiotics can inactivate, reducing the immune response. Doxycycline is active against Salmonella, so vaccine failure is possible.
What this interaction means in plain words
Doxycycline and Typhoid vaccine live can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Antibacterial activity kills or inhibits the live attenuated Salmonella strain, reducing colonisation and immunogenicity.
What to do
Avoid antibiotics from at least 3 days before until after completing the vaccine course, per labeling. If antibiotics are required, delay vaccination or use the inactivated injectable vaccine.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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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 Typhoid vaccine live?
MediHelp rates the interaction as major. Doxycycline and Typhoid vaccine live can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Oral live attenuated typhoid vaccine (Ty21a) contains viable bacteria that antibiotics can inactivate, reducing the immune response. Doxycycline is active against Salmonella, so vaccine failure is possible.
How serious is the interaction between Doxycycline and Typhoid vaccine live?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid antibiotics from at least 3 days before until after completing the vaccine course, per labeling. If antibiotics are required, delay vaccination or use the inactivated injectable vaccine.
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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