Can I take lamotrigine with the progestin-only pill (mini pill)?

The Lamictal label says progestin-only pills had no effect on lamotrigine plasma levels in the report it cites. The CDC's 2024 contraceptive criteria rate progestin-only pills as category 1, meaning no restriction, for people who take lamotrigine. Your prescriber still needs to know about both medicines.

Does a hormonal IUD affect lamotrigine?

The CDC rates both the levonorgestrel IUD and the copper IUD as category 1 with lamotrigine. It says no drug interactions have been reported among women with epilepsy who take lamotrigine and use the levonorgestrel IUD. The Lamictal label says other hormonal preparations have not been systematically evaluated.

Why do I feel dizzy during the placebo week of my pill pack?

The Lamictal label says lamotrigine levels are expected to rise during the pill-free week, as much as doubling by the end of it. It lists dizziness, ataxia, and double vision as possible results. Tell your prescriber if this happens. The label says dose changes limited to that week are not recommended.

Does hormone replacement therapy lower lamotrigine too?

The label says hormone replacement therapy has not been studied with lamotrigine. It adds that other estrogen-containing therapies may interfere with lamotrigine, so close clinical monitoring may be necessary. Tell your prescriber before you start or stop it.

How fast does the lamotrigine level change after stopping the pill?

Fast. In a 2007 placebo-controlled trial, the lamotrigine level was 84% higher after the switch from a combined pill to placebo, and most of the rise came in the first week. The label says the maintenance dose will in most cases need to be decreased when the pill stops, under a prescriber's direction.

Does Birth Control Make Lamotrigine Less Effective?

The short answer: Yes, if the birth control contains estrogen. The FDA label for Lamictal (lamotrigine) says estrogen-containing oral contraceptives lower lamotrigine concentrations by approximately 50%. The level then climbs again during the pill-free week. Progestin-only methods and IUDs do not appear to do this. Tell your prescriber before you start or stop any hormonal method.

How does estrogen birth control lower lamotrigine levels?

Your liver clears lamotrigine through a process called glucuronidation. The Lamictal prescribing information on DailyMed lists estrogen-containing products among the drugs that speed this process up. Faster clearance means less lamotrigine in the blood from the same dose.

The label describes one study in 16 female volunteers. They took lamotrigine 300 mg a day with a pill that contained 30 mcg ethinylestradiol and 150 mcg levonorgestrel. The pill raised lamotrigine clearance about 2-fold. Total exposure (AUC) fell by a mean of 52%, and the peak level fell by 39%.

That study is published. Its abstract on PubMed calls the result "a clinically relevant pharmacokinetic interaction."

Studies in patients found the same pattern:

A 2003 report in Neurology compared 22 women who took lamotrigine with a combined pill and 30 women who took lamotrigine alone. The mean level was 13 micromol/L with the pill and 28 micromol/L without it.
A 2007 double-blind crossover trial in Epilepsia switched women between a combined pill and placebo. The dose-corrected lamotrigine level was 84% higher after placebo. Most of the rise came in the first week.

Both of these studies enrolled women with epilepsy. The mechanism is in the liver, so it does not depend on the reason you take lamotrigine. The label's patient section puts it plainly: starting these medicines "may lessen how well LAMICTAL works."

What happens during the pill-free week?

The effect reverses fast. When the estrogen stops, clearance slows and the lamotrigine level rises. The label says plasma levels "are expected to rise, as much as doubling at the end of the week" of inactive pills.

In the volunteer study, trough levels were about 2-fold higher at the end of the inactive week than at the end of the active pills. The label describes these as "gradual transient increases."

A higher level can cause side effects. The label names three: dizziness, ataxia (poor coordination), and diplopia (double vision). So some people feel fine for three weeks and unsteady in the fourth.

The label says the rise is greater if the lamotrigine dose is increased in the days before or during the pill-free week. It also says: "Dose adjustments limited to the pill-free week are not recommended." If side effects keep occurring in that week, the label says the overall maintenance dose may need adjustment. That is a decision for your prescriber.

Does lamotrigine make birth control pills less effective?

The evidence is weaker in this direction, and the sources do not fully agree.

In the same volunteer study, lamotrigine did not change the ethinylestradiol (estrogen) part of the pill. The levonorgestrel (progestin) part fell: mean AUC dropped 19% and peak level dropped 12%. Progesterone tests showed no hormonal evidence of ovulation in any of the 16 volunteers. But FSH, LH, and estradiol tests showed "some loss of suppression" of the hormone system that the pill controls.

The label's conclusion is careful: "the possibility of decreased contraceptive efficacy in some patients cannot be excluded." The published abstract adds that 7 of 22 subjects (32%) reported bleeding between periods while they took both drugs.

MedlinePlus is more direct. It says lamotrigine "may decrease the effectiveness of hormonal contraceptives (birth control pills, patches, rings, and injections)" and tells readers to talk to their doctor about other ways to prevent pregnancy. Reliable contraception matters on any mood stabilizer. Our guide to bipolar medications during pregnancy explains why planning helps.

Which birth control methods interact with lamotrigine?

The estrogen is the problem. A 2005 study in Epilepsia compared 11 women on an ethinyl estradiol method, 16 on a progestogen-only method, and 18 on no hormonal method. Lamotrigine levels were lower in the estrogen group only. The authors found no difference between oral, topical, and injected progestogens.

The label cites this finding. It says progestin-only pills "had no effect on lamotrigine plasma levels," so dose changes "in the presence of progestogens alone will likely not be needed."

The CDC rates each method in its U.S. Medical Eligibility Criteria for Contraceptive Use, 2024. Category 1 means no restriction. Category 3 means the risks usually outweigh the advantages. For a person who takes lamotrigine:

Combined hormonal methods (pill, patch, ring): category 3. The CDC says lamotrigine levels "decrease significantly" during combined pill use.
Progestin-only pill, implant, and DMPA injection: category 1.
Copper IUD and levonorgestrel IUD: category 1.

The CDC adds a limit. Its category 3 rating "applies only for situations where lamotrigine monotherapy is taken concurrently with COCs" (combined oral contraceptives).

Two more points come from the label. The patch, the ring, and hormone replacement therapy (HRT) "have not been studied," but the label says they may affect lamotrigine in a similar way. And people who also take carbamazepine, phenytoin, phenobarbital, primidone, or rifampin already clear lamotrigine faster. For them, the label says no lamotrigine dose adjustment should be necessary because of the pill.

What does the label say about dose changes?

The label says "adjustments to maintenance doses will be necessary in most patients starting or stopping estrogen-containing products." Here is its wording for each case. This is label information for prescribers, not a plan to follow on your own.

Starting lamotrigine while on the pill: the usual slow dose-escalation schedule applies. The label says no change to that schedule "should be necessary solely based on the use of estrogen-containing oral contraceptives."
Starting the pill on a stable lamotrigine dose: the maintenance dose "will in most cases need to be increased by as much as 2-fold." The label says increases should not exceed its recommended rate.
Stopping the pill: the maintenance dose "will in most cases need to be decreased by as much as 50%."

The label also says a therapeutic plasma range "has not been established for lamotrigine." Prescribers adjust the dose by how you respond. Never raise the dose yourself. Fast increases are one of the risk factors in the boxed warning, which our Lamictal rash warning article covers.

What signs should you report to your prescriber?

The label tells patients: "Do not start or stop taking birth control pills or other female hormonal medicine until you have talked with your healthcare provider." It also lists what to report. Contact your prescriber if you notice:

Dizziness, lack of coordination, or double vision. These can mean the lamotrigine level is too high. They are more likely in the pill-free week or after you stop the pill.
Mood symptoms that return after you start an estrogen method. The level may have fallen. Our sister site depression.md describes the signs of a depressive episode.
Changes in your menstrual pattern, such as breakthrough bleeding. The label asks patients to report these promptly.
Any new rash. Treat it as urgent.

Tell every prescriber about both medicines. That includes the clinician who manages your contraception and the one who manages your mood stabilizer.

The bottom line

Estrogen-containing birth control cuts lamotrigine levels by about half, and the level rebounds in the pill-free week. Progestin-only methods and IUDs do not appear to change lamotrigine levels, and the CDC gives them its least restrictive rating. Lamotrigine lowers the progestin in a combined pill modestly, and the label cannot rule out reduced contraceptive protection. Do not start or stop a hormonal method, or change your lamotrigine dose, without your prescriber.

Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Talk with your prescriber or pharmacist before you start, stop, or change birth control or lamotrigine.