Exenatide Injection and Ampicillin: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Exenatide Injection
Ampicillin
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
What happens
Reduced oral antibiotics absorption and reduced efficacy of oral antibiotics
Interaction Deep Dive
Exenatide slows gastric emptying. Therefore, exenatide has the potential to reduce the rate of absorption of orally administered antibiotics. Exert caution when exenatide is coadministered with oral antibiotics, where a slower rate of oral absorption may be clinically meaningful. For oral antibiotics that are dependent on threshold concentrations for efficacy, advise patients to take those drugs at least 1 hour before exenatide injection. If such drugs are to be administered with food, advise patients to take them with a meal or snack when exenatide is not administered1.
Why it happens (mechanism)
Slowed gastric emptying by exenatide
Common questions
Can I take Exenatide Injection and Ampicillin together?
Reduced oral antibiotics absorption and reduced efficacy of oral antibiotics Always confirm with your pharmacist or prescriber before making any change.
How serious is the Exenatide Injection and Ampicillin interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "rapid". Effects can appear quickly, often within about 24 hours of combining the drugs.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Exenatide Injection or Ampicillin need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (1)
- Product Information: BYETTA(R) subcutaneous injection, exenatide subcutaneous injection. AstraZeneca Pharmaceuticals LP (per FDA), Wilmington, DE, 2025. DailyMed
Keep reading about Exenatide Injection
Keep reading about Ampicillin
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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