Drug interactions
Aztreonam + Microbiota
Severity: Moderate
Aztreonam and Microbiota: 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 microbiota products contain live bacterial spores intended to recolonize the gut. Systemic antibiotics may reduce spore viability and blunt the preventive effect against recurrent Clostridioides difficile infection, although aztreonam has a narrow Gram-negative spectrum so the effect is likely smaller.
What this interaction means in plain words
Aztreonam and Microbiota 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
Antibacterial activity may reduce the viability of the live bacterial spores in the product.
What to do
Finish the antibiotic course before starting oral microbiota therapy, and keep the labeled interval after the last antibiotic dose (typically 2 to 4 days).
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 Aztreonam
Frequently asked questions
Can I take Aztreonam with Microbiota?
MediHelp rates the interaction as moderate. Aztreonam and Microbiota 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 microbiota products contain live bacterial spores intended to recolonize the gut. Systemic antibiotics may reduce spore viability and blunt the preventive effect against recurrent Clostridioides difficile infection, although aztreonam has a narrow Gram-negative spectrum so the effect is likely smaller.
How serious is the interaction between Aztreonam and Microbiota?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Finish the antibiotic course before starting oral microbiota therapy, and keep the labeled interval after the last antibiotic dose (typically 2 to 4 days).
What other medicines interact with Aztreonam?
MediHelp also lists interactions of Aztreonam with, for example, Cefoxitin, Cholera vaccine, Sodium picosulfate / magnesium oxide / anhydrous citric acid. The full list is on the Aztreonam page.
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