Lamotrigine and Birth Control Interaction

Introduction to the Interaction

The Centers for Disease Control and Prevention recommends that women taking lamotrigine should avoid combined hormonal contraceptives because this combination creates a dangerous bidirectional drug interaction, with estrogen-containing contraceptives reducing lamotrigine levels by more than 50% and lamotrigine being classified as Category 3 for combined hormonal contraceptive use, meaning the risks usually outweigh benefits 1, 2

The U.S. Medical Eligibility Criteria classifies lamotrigine as Category 3 for combined hormonal contraceptive use, meaning risks usually outweigh benefits, and recommends progestin-only methods and non-hormonal methods as safe alternatives 1, 2
Progestin-only pills, such as norethindrone or norgestrel, are considered Category 1, with no interaction with lamotrigine, and are a recommended option 1
The copper IUD and levonorgestrel IUD are also considered Category 1, with no restrictions and no drug interaction, and are highly effective, long-acting contraceptive options 1, 3
The DMPA injection and etonogestrel implant are also considered Category 1, with no interaction with lamotrigine, and are recommended options 1

The Centers for Disease Control and Prevention recommends a clinical management algorithm that prioritizes copper IUD or levonorgestrel IUD as the first choice for highly effective, long-acting contraception without drug interactions, followed by progestin-only pills, DMPA injection, or etonogestrel implant as second choices 1, 3
If a patient insists on combined hormonal contraceptives, the algorithm recommends counseling extensively about seizure risk and contraceptive failure risk, obtaining a baseline lamotrigine level, planning for lamotrigine dose adjustment, and arranging close follow-up with neurology 2