Drug interactions
Ethinyl estradiol-levonorgestrel + Posaconazole
Severity: Moderate
Ethinyl estradiol-levonorgestrel and Posaconazole: moderate 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
Posaconazole is a strong CYP3A4 inhibitor and can raise ethinyl estradiol and levonorgestrel exposure. This may increase estrogen-related adverse effects such as nausea, breast tenderness and thromboembolic risk, though the increase is typically modest.
What this interaction means in plain words
Ethinyl estradiol-levonorgestrel and Posaconazole can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Ethinyl estradiol-levonorgestrel belongs to Endocrine; Posaconazole belongs to Anti Fungals.
Why it happens
Inhibition of CYP3A4-mediated metabolism of ethinyl estradiol and levonorgestrel by posaconazole.
What to do
Monitor for estrogenic adverse effects and blood pressure during co-therapy, and consider a lower-dose or alternative contraceptive if tolerability is poor.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Ethinyl estradiol-levonorgestrel
- Ethinyl estradiol-levonorgestrel + Fezolinetant Contraindicated
- Ethinyl estradiol-levonorgestrel + Ombitasvir / paritaprevir / ritonavir and dasabuvir Contraindicated
- Ethinyl estradiol-levonorgestrel + Tranexamic acid Contraindicated
- Aminocaproic acid + Ethinyl estradiol-levonorgestrel Major
- Amobarbital + Ethinyl estradiol-levonorgestrel Major
- Anastrozole + Ethinyl estradiol-levonorgestrel Major
Other interactions of Posaconazole
- Artemether + Posaconazole Contraindicated
- Avanafil + Posaconazole Contraindicated
- Cobimetinib + Posaconazole Contraindicated
- Conivaptan + Posaconazole Contraindicated
- Dihydroergotamine intranasal + Posaconazole Contraindicated
- Dihydroergotamine + Posaconazole Contraindicated
Frequently asked questions
Can I take Ethinyl estradiol-levonorgestrel with Posaconazole?
MediHelp rates the interaction as moderate. Ethinyl estradiol-levonorgestrel and Posaconazole can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Posaconazole is a strong CYP3A4 inhibitor and can raise ethinyl estradiol and levonorgestrel exposure. This may increase estrogen-related adverse effects such as nausea, breast tenderness and thromboembolic risk, though the increase is typically modest.
How serious is the interaction between Ethinyl estradiol-levonorgestrel and Posaconazole?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for estrogenic adverse effects and blood pressure during co-therapy, and consider a lower-dose or alternative contraceptive if tolerability is poor.
What other medicines interact with Ethinyl estradiol-levonorgestrel?
MediHelp also lists interactions of Ethinyl estradiol-levonorgestrel with, for example, Fezolinetant, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Tranexamic acid. The full list is on the Ethinyl estradiol-levonorgestrel page.
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