Etinylestradiol and Lamotrigine: Drug Interaction Guide
Quick answer: This combination requires caution. Etinylestradiol and Lamotrigine can be used together with adjustments and monitoring.
How Etinylestradiol interacts with Lamotrigine
Combined oral contraceptives induce UGT1A4 glucuronidation of lamotrigine, reducing serum levels by ~50% during active pill weeks with risk of seizure breakthrough.
What you should do
Increase lamotrigine dose during active pill weeks and reduce during pill-free week; monitor seizure control and lamotrigine levels.
Key facts
Severity
Moderate — caution required
Mechanism
Combined oral contraceptives induce UGT1A4 glucuronidation of lamotrigine, reducing serum levels by ~50% during active p...
Action
Increase lamotrigine dose during active pill weeks and reduce during pill-free week; monitor seizure control and lamotri...
Frequently asked questions
Can I take Etinylestradiol and Lamotrigine together?
With caution. Increase lamotrigine dose during active pill weeks and reduce during pill-free week; monitor seizure control and lamotrigine levels.
What is the severity of this interaction?
The interaction between Etinylestradiol and Lamotrigine is classified as Moderate — caution required. Combined oral contraceptives induce UGT1A4 glucuronidation of lamotrigine, reducing serum levels by ~50% during active pill weeks with risk of seizure breakthrough.
What should I do if I'm prescribed both?
Increase lamotrigine dose during active pill weeks and reduce during pill-free week; monitor seizure control and lamotrigine levels. Always consult your prescribing clinician — do not stop or change medications without medical guidance.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.