Drug interactions
Estrogens esterified + Lamotrigine
Severity: Moderate
Estrogens esterified and Lamotrigine: 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
Esterified estrogens may lower lamotrigine concentrations, with a risk of breakthrough seizures or mood relapse. The effect is best documented for ethinylestradiol-containing products.
What this interaction means in plain words
Estrogens esterified and Lamotrigine 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
Estrogens induce glucuronidation of lamotrigine, increasing its clearance.
What to do
Monitor clinical response or lamotrigine levels when starting or stopping estrogen therapy. Adjust the lamotrigine dose as needed.
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 Lamotrigine
Frequently asked questions
Can I take Estrogens esterified with Lamotrigine?
MediHelp rates the interaction as moderate. Estrogens esterified and Lamotrigine 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. Esterified estrogens may lower lamotrigine concentrations, with a risk of breakthrough seizures or mood relapse. The effect is best documented for ethinylestradiol-containing products.
How serious is the interaction between Estrogens esterified and Lamotrigine?
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 clinical response or lamotrigine levels when starting or stopping estrogen therapy. Adjust the lamotrigine dose as needed.
What other medicines interact with Lamotrigine?
MediHelp also lists interactions of Lamotrigine with, for example, Desogestrel-ethinyl estradiol, Divalproex, Dofetilide. The full list is on the Lamotrigine page.
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