Drug interactions
Desogestrel-ethinyl estradiol + Fezolinetant
Severity: Contraindicated
Desogestrel-ethinyl estradiol and Fezolinetant: contraindicated 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
Fezolinetant is metabolized mainly by CYP1A2, and ethinyl estradiol is a weak CYP1A2 inhibitor that can raise fezolinetant exposure. Fezolinetant labeling contraindicates use with CYP1A2 inhibitors, and its indication for menopausal vasomotor symptoms means combined contraceptive use is rarely appropriate anyway. Increased exposure raises the risk of hepatotoxicity.
What this interaction means in plain words
Desogestrel-ethinyl estradiol and Fezolinetant are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Desogestrel-ethinyl estradiol belongs to Endocrine; Fezolinetant belongs to Endocrine.
Why it happens
Ethinyl estradiol inhibits CYP1A2, reducing fezolinetant metabolism and increasing its plasma concentration.
What to do
Avoid coadministration. Use an alternative approach for vasomotor symptoms or contraception, and monitor liver tests if fezolinetant is used.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
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Other interactions of Desogestrel-ethinyl estradiol
Other interactions of Fezolinetant
- Cimetidine + Fezolinetant Contraindicated
- Ciprofloxacin + Fezolinetant Contraindicated
- Estradiol + Fezolinetant Contraindicated
- Ethinyl estradiol-drospirenone + Fezolinetant Contraindicated
- Ethinyl estradiol-levonorgestrel + Fezolinetant Contraindicated
- Ethinyl estradiol-norgestimate + Fezolinetant Contraindicated
Frequently asked questions
Can I take Desogestrel-ethinyl estradiol with Fezolinetant?
MediHelp rates the interaction as contraindicated. Desogestrel-ethinyl estradiol and Fezolinetant are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Fezolinetant is metabolized mainly by CYP1A2, and ethinyl estradiol is a weak CYP1A2 inhibitor that can raise fezolinetant exposure. Fezolinetant labeling contraindicates use with CYP1A2 inhibitors, and its indication for menopausal vasomotor symptoms means combined contraceptive use is rarely appropriate anyway. Increased exposure raises the risk of hepatotoxicity.
How serious is the interaction between Desogestrel-ethinyl estradiol and Fezolinetant?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid coadministration. Use an alternative approach for vasomotor symptoms or contraception, and monitor liver tests if fezolinetant is used.
What other medicines interact with Desogestrel-ethinyl estradiol?
MediHelp also lists interactions of Desogestrel-ethinyl estradiol with, for example, Aminocaproic acid, Amobarbital, Anastrozole. The full list is on the Desogestrel-ethinyl estradiol page.
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