Drug interactions
Ceftriaxone + Typhoid vaccine live
Severity: Major
Ceftriaxone 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 typhoid vaccine (Ty21a) relies on viable Salmonella Typhi replicating in the gut, and antibacterial agents active against the strain can reduce its effectiveness. Parenteral ceftriaxone is active against Salmonella Typhi and could blunt the immune response.
What this interaction means in plain words
Ceftriaxone 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 the immune response.
What to do
Give live oral typhoid vaccine at least 3 days after the last antibiotic dose, or vaccinate before starting the antibiotic. If urgent protection is needed, use the inactivated Vi polysaccharide 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 Ceftriaxone
- Calcium chloride + Ceftriaxone Contraindicated
- Calcium gluconate + Ceftriaxone Contraindicated
- Calcium + Ceftriaxone Contraindicated
- Ceftriaxone + Lactated ringer's Contraindicated
- Ceftriaxone + Ringer's solution Contraindicated
- Calcium acetate + Ceftriaxone Major
Frequently asked questions
Can I take Ceftriaxone with Typhoid vaccine live?
MediHelp rates the interaction as major. Ceftriaxone 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 typhoid vaccine (Ty21a) relies on viable Salmonella Typhi replicating in the gut, and antibacterial agents active against the strain can reduce its effectiveness. Parenteral ceftriaxone is active against Salmonella Typhi and could blunt the immune response.
How serious is the interaction between Ceftriaxone 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: Give live oral typhoid vaccine at least 3 days after the last antibiotic dose, or vaccinate before starting the antibiotic. If urgent protection is needed, use the inactivated Vi polysaccharide vaccine.
What other medicines interact with Ceftriaxone?
MediHelp also lists interactions of Ceftriaxone with, for example, Calcium chloride, Calcium gluconate, Calcium. The full list is on the Ceftriaxone page.
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