Drug interactions
Ethinyl estradiol-norgestimate + Fezolinetant
Severity: Contraindicated
Ethinyl estradiol-norgestimate 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
Ethinyl estradiol-norgestimate 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.
Ethinyl estradiol-norgestimate 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Ethinyl estradiol-norgestimate and Fezolinetant, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Ethinyl estradiol-norgestimate
- Ethinyl estradiol-norgestimate + Ombitasvir / paritaprevir / ritonavir and dasabuvir Contraindicated
- Ethinyl estradiol-norgestimate + Tranexamic acid Contraindicated
- Aminocaproic acid + Ethinyl estradiol-norgestimate Major
- Amobarbital + Ethinyl estradiol-norgestimate Major
- Anastrozole + Ethinyl estradiol-norgestimate Major
- Apalutamide + Ethinyl estradiol-norgestimate Major
Other interactions of Fezolinetant
- Cimetidine + Fezolinetant Contraindicated
- Ciprofloxacin + Fezolinetant Contraindicated
- Desogestrel-ethinyl estradiol + Fezolinetant Contraindicated
- Estradiol + Fezolinetant Contraindicated
- Ethinyl estradiol-drospirenone + Fezolinetant Contraindicated
- Ethinyl estradiol-levonorgestrel + Fezolinetant Contraindicated
Frequently asked questions
Can I take Ethinyl estradiol-norgestimate with Fezolinetant?
MediHelp rates the interaction as contraindicated. Ethinyl estradiol-norgestimate 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 Ethinyl estradiol-norgestimate 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 Ethinyl estradiol-norgestimate?
MediHelp also lists interactions of Ethinyl estradiol-norgestimate with, for example, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Tranexamic acid, Aminocaproic acid. The full list is on the Ethinyl estradiol-norgestimate page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
