Drug interactions
Ethinylestradiol + Exemestane
Severity: Major
Ethinylestradiol and Exemestane: 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
Exemestane suppresses estrogen synthesis in postmenopausal women with breast cancer, and ethinylestradiol supplies estrogen that opposes this. The combination may reduce exemestane efficacy.
What this interaction means in plain words
Ethinylestradiol and Exemestane 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
Pharmacodynamic antagonism: exogenous estrogen counteracts aromatase inhibitor-induced estrogen suppression.
What to do
Avoid estrogen-containing products during exemestane therapy. Use non-hormonal alternatives for contraception or menopausal symptoms.
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 Exemestane
Frequently asked questions
Can I take Ethinylestradiol with Exemestane?
MediHelp rates the interaction as major. Ethinylestradiol and Exemestane 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. Exemestane suppresses estrogen synthesis in postmenopausal women with breast cancer, and ethinylestradiol supplies estrogen that opposes this. The combination may reduce exemestane efficacy.
How serious is the interaction between Ethinylestradiol and Exemestane?
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 estrogen-containing products during exemestane therapy. Use non-hormonal alternatives for contraception or menopausal symptoms.
What other medicines interact with Exemestane?
MediHelp also lists interactions of Exemestane with, for example, Bazedoxifene-conjugated estrogens, Desogestrel-ethinyl estradiol, Estradiol. The full list is on the Exemestane page.
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