Estradiol and Exenatide: Interaction Details
AI-assisted, pharmacist-reviewed · Source data updated Aug 8, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Exenatide
Estradiol
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 contraceptives absorption and reduced efficacy of oral contraceptives
Interaction Deep Dive
Exenatide slows gastric emptying. Therefore, exenatide has the potential to reduce the rate of absorption of orally administered contraceptives. Exert caution when exenatide is coadministered with oral contraceptives, where a slower rate of oral absorption may be clinically meaningful. For oral contraceptives 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
Literature reports
1 report — tap to read
a) In a drug interaction study, the effect of exenatide (10 mcg BID) on single and on multiple doses of a combination oral contraceptive (30 mcg ethinyl estradiol plus 150 mcg levonorgestrel) was studied in healthy female subjects. Repeated daily doses of the oral contraceptive (OC) given 30 minutes after exenatide administration decreased the Cmax of ethinyl estradiol and levonorgestrel by 45% and 27%, respectively, and delayed the Tmax of ethinyl estradiol and levonorgestrel by 3.0 hours and 3.5 hours, respectively, as compared to the oral contraceptive administered alone. Administration of repeated daily doses of the OC one hour prior to exenatide administration decreased the mean Cmax of ethinyl estradiol by 15% but the mean Cmax of levonorgestrel was not significantly changed as compared to when the OC was given alone. exenatide did not alter the mean trough concentrations of levonorgestrel after repeated daily dosing of the oral contraceptive for both regimens. However, the mean trough concentration of ethinyl estradiol was increased by 20% when the OC was administered 30 minutes after exenatide administration injection as compared to when the OC was given alone. The effect of exenatide on OC pharmacokinetics is confounded by the possible food effect on OC in this study 1.
Common questions
Can I take Estradiol and Exenatide together?
Reduced oral contraceptives absorption and reduced efficacy of oral contraceptives Always confirm with your pharmacist or prescriber before making any change.
How serious is the Estradiol and Exenatide interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Estradiol or Exenatide 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
Keep reading about Estradiol
These medications also interact with supplements
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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