Lamotrigine Drug Interactions

Antiepileptics have complex interactions due to enzyme induction or inhibition and protein binding displacement.

Key Drug Interactions

→Oral contraceptives: enzyme-inducing AEDs (carbamazepine, phenytoin, phenobarbital) reduce contraceptive efficacy
→Warfarin: enzyme-inducing AEDs reduce warfarin levels; valproate increases INR
→Other AEDs: complex pharmacokinetic interactions
→Lithium: combined CNS toxicity risk
→Methotrexate: valproate may increase levels

Alcohol Interactions

→Alcohol lowers the seizure threshold and can trigger breakthrough seizures. Alcohol also enhances CNS side effects of antiepileptics. Avoid alcohol or limit strictly.

Supplement and Food Interactions

→Folic acid supplementation is recommended for women of childbearing age taking valproate, carbamazepine, or phenytoin due to risk of neural tube defects.

Safety Note

Always tell your doctor and pharmacist about all prescription medicines, non-prescription medicines, vitamins, and herbal or dietary supplements before starting Lamotrigine. Keep an up-to-date medicines list to share with all healthcare providers.

Frequently Asked Questions

Can I take Lamotrigine with common over-the-counter medicines?

Some OTC medications interact with Lamotrigine. NSAIDs, aspirin, antihistamines, antacids, and herbal products can all have interactions. Ask your pharmacist to check for interactions before taking any new OTC product.

Can I drink alcohol while taking Lamotrigine?

Alcohol lowers the seizure threshold and can trigger breakthrough seizures. Alcohol also enhances CNS side effects of antiepileptics. Avoid alcohol or limit strictly.

More About Lamotrigine

Dosage & Administration

Side Effects

Warnings & Precautions

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Medical Disclaimer: This drug reference is provided for informational purposes only and is not a substitute for professional medical advice. Always consult your physician or pharmacist before changing your medication. Information reviewed by the vHospital Editorial Team · Sources: WHO, BNF, FDA prescribing information.