Drug interactions
Butalbital + Estradiol
Severity: Moderate
Butalbital and Estradiol: 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
Butalbital is a barbiturate with enzyme-inducing potential and may lower estradiol concentrations. The effect is likely modest with intermittent analgesic use but may matter with regular use.
What this interaction means in plain words
Butalbital and Estradiol 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.
Why it happens
Induction of CYP3A4-mediated estradiol metabolism by butalbital.
What to do
Monitor for loss of estrogen effect, such as breakthrough bleeding or recurrent vasomotor symptoms, if butalbital is used frequently. Raise the estradiol dose if needed, and use a backup method if estradiol is relied on for contraception.
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 Estradiol
- Anastrozole + Estradiol Contraindicated
- Estradiol + Fezolinetant Contraindicated
- Estradiol + Ospemifene Contraindicated
- Antithrombin alfa + Estradiol Major
- Antithrombin iii + Estradiol Major
- Estradiol + Exemestane Major
Frequently asked questions
Can I take Butalbital with Estradiol?
MediHelp rates the interaction as moderate. Butalbital and Estradiol 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. Butalbital is a barbiturate with enzyme-inducing potential and may lower estradiol concentrations. The effect is likely modest with intermittent analgesic use but may matter with regular use.
How serious is the interaction between Butalbital and Estradiol?
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 loss of estrogen effect, such as breakthrough bleeding or recurrent vasomotor symptoms, if butalbital is used frequently. Raise the estradiol dose if needed, and use a backup method if estradiol is relied on for contraception.
What other medicines interact with Estradiol?
MediHelp also lists interactions of Estradiol with, for example, Anastrozole, Fezolinetant, Ospemifene. The full list is on the Estradiol page.
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