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Lamictal (lamotrigine) is an anti-seizure medicine approved to treat epilepsy in children and adults and to delay mood episodes in people with bipolar I disorder. The most common side effects include dizziness, headache, vomiting and rash. The drug has a black box warning for life-threatening skin rashes.

Last Modified: September 5, 2023
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GlaxoSmithKline developed Lamictal, and the U.S. Food and Drug Administration approved it in 1994.

Even though it’s only approved for epilepsy and as maintenance medicine to delay mood episodes in people with bipolar I, some medical providers prescribe it to treat other conditions off-label — uses not approved by the FDA.

Off-label uses include:
  • Panic disorder
  • Anxiety
  • Migraines and headaches
  • Rapid-cycling bipolar depression
  • Binge eating disorder
  • Borderline personality disorder
  • Posttraumatic stress disorder (PTSD)

Lamictal XR, the extended-release version of Lamictal, is not approved for patients younger than 13. It’s only approved for treating certain types of seizures.

In January 2020, Taro Pharmaceuticals, a manufacturer of generic Lamictal, issued a recall for one lot of lamotrigine because it was contaminated with a small amount of enalapril maleate — a blood pressure and heart failure drug that may cause birth defects.

Researchers in 2022 published results on a generic version of extended-release lamotrigine and found the drug to be bioequivalent to the brand name medication.

How It Works

Researchers believe Lamictal works by slowing down electrical signals and inhibiting certain chemicals in the brain that cause brain cells to signal too quickly. When brain cells work too fast, it causes seizures. By slowing down these brain signals, lamotrigine may help to reduce seizure episodes.

In people with bipolar disorder, the medication helps to reduce mood swings, though researchers aren’t sure how the drug actually works.

Recommended Dosages

Lamictal comes in several forms and strengths. Depending on the reason for treatment, the recommended dosage is different.

Forms and Strengths
  • Tablets: 25 mg, 100 mg, 150 mg, and 200 mg
  • Tablets for oral suspension: 2 mg, 5 mg, and 25 mg
  • Orally disintegrating tablets: 25 mg, 50 mg, 100 mg, and 200 mg
  • Extended release tablets: 5 mg, 50 mg, 100 mg, 200 mg, 250 mg, and 300 mg

Patients typically take Lamictal once or twice a day, and it can be taken with or without food. If taking Lamictal XR, make sure to take the pills whole and don’t crush, cut or chew them.

The medication starts at a low dose. Then, the dose gets higher over the course of several weeks. People who are taking the drug with other drugs for seizures take lower doses. They may take it every other day when beginning treatment.

Common Side Effects

Researchers studied Lamictal in clinical trials that included thousands of patients in several groups. Across these studies, researchers defined common side effects as those that occurred in 10 percent or more of patients using the drug for epilepsy and five percent or more of patients using the drug for bipolar disorder.

Common side effects of Lamictal (lamotrigine) include:
  • Ataxia (impaired balance or coordination)
  • Back pain, abdominal pain
  • Blurred vision
  • Diarrhea
  • Diplopia (double vision)
  • Dizziness
  • Fatigue
  • Headache
  • Insomnia
  • Nausea
  • Pharyngitis
  • Rash
  • Rhinitis (inflammation of membranes in the nose)
  • Somnolence (drowsiness)
  • Vomiting
  • Xerostomia (dry mouth)

The most common side effects in children were infection, vomiting, diarrhea, accidental injury, fever, abdominal pain and tremor.

In clinical trials, the most common side effects that caused people to drop out of the trial included: rash, headache, dizziness and impaired balance or coordination.

Serious Side Effects

There have been reports of serious side effects linked to Lamictal, but these side effects are rare, according to the drug’s label. These range from serious skin rashes to death.

Skin Rashes

In clinical trials, 11 of 3,348 adults with epilepsy who received Lamictal had a serious rash that led to hospitalization and discontinuation. Researchers received postmarketing reports of rash-related deaths, but the numbers were too few to estimate the exact rate.

Serious rashes that led to hospitalization were: Stevens-Johnson syndrome — a serious, blistering rash — angioedema, toxic epidermal necrolysis and rashes associated with multiorgan hypersensitivity.

Hemophagocytic Lymphohistiocytosis (HLH)

HLH is a potentially life-threatening syndrome caused by overactivation of the immune system. The overactivation causes severe inflammation throughout the body. In April 2018, the FDA released a warning that Lamictal can cause HLH.

HLH usually starts with a high fever and rash. It causes problems with blood cells and internal organs such as the lungs, kidneys and liver. It usually starts within 8 to 24 days after starting treatment.

Multiorgan Hypersensitivity Reactions and Organ Failure

Multiorgan hypersensitivity reactions, also known as drug reaction with eosinophilia and systemic symptoms (DRESS), have occurred. This is a potentially fatal drug reaction.

Symptoms include fever, rash, and other organ problems. It sometimes resembles a viral infection. Report these symptoms to your medical provider right away.

Blood Problems

Some people who took Lamictal had abnormal blood cell counts such as neutropenia, leukopenia, anemia, thrombocytopenia, pancytopenia, and, rarely, aplastic anemia and pure red cell aplasia.

Suicidal Thoughts or Behaviors

Taking Lamictal may increase the risk of suicidal thoughts or behaviors. In studies of anti-epileptic drugs (AED) such as Lamictal, patients who took one type of drug had about twice the risk of suicidal thoughts and behaviors compared to people who took a placebo. These symptoms may start as early as one week after starting treatment.

Aseptic Meningitis

Taking Lamictal increases the risk of aseptic meningitis — inflammation of the membrane covering the spinal cord and brain. Symptoms include rash, fever, vomiting, nausea and stiffness and soreness in the neck. Symptoms usually appear anywhere from one day to about a month after starting therapy.

Withdrawal Seizures

Patients taking Lamictal should not abruptly stop treatment. Patients with epilepsy may experience an increase in seizure frequency and people with bipolar disorder may develop seizures. Slowly weaning off the drug for at least two weeks is recommended.

Drug Interactions

Lamictal’s drug label lists several drugs that may increase or decrease the drug’s blood concentration. This could lead to less effective medication or an increase in side effects if the concentration is too high.

This is not a complete list of potential drug interactions. Make sure you tell your medical provider about all medications, supplements and herbs you take.

Drugs that interact with Lamictal include:
  • Oral contraceptives with ethinylestradiol and levonorgestrel decrease lamotrigine concentration and decrease levonorgestrel.
  • Carbamazepine and carbamazepine epoxide decreases lamotrigine concentration and may increase carbamazepine epoxide levels.
  • Lopinavir/ritonavir decreases lamotrigine concentration.
  • Atazanavir/ritonavir decreases lamotrigine concentration.
  • Phenobarbital/primidone decreases lamotrigine concentration.
  • Phenytoin decreases lamotrigine concentration.
  • Rifampin decreases lamotrigine concentration.
  • Valproate increases lamotrigine concentration two fold. Some studies suggest taking these drugs together increases the risk of potentially fatal drug-induced skin rashes.

Special Precautions

Make sure you talk to your medical provider about any allergies you have, medications you take or preexisting health conditions. Lamictal might not be safe or effective for everyone.

Before taking Lamictal:
  • Tell your doctor and pharmacist if you are allergic to lamotrigine or any ingredients in the tablets. For example, some formulas may include lactose.
  • Tell your doctor or pharmacist about the medications you take, especially drugs in the interactions list or other drugs used to treat epilepsy.
  • Tell your doctor if you use medications that contain female hormones such as birth control or hormone replacement therapy (HRT).
  • Tell your doctor if you have or have ever had lupus or any other autoimmune disease in which the immune system attacks healthy tissues and organs; a blood disorder; mental health conditions or kidney or liver disease.
  • Tell your doctor if you plan to be pregnant or are pregnant. Call your doctor right away if you become pregnant while taking lamotrigine.
  • Tell your doctor if you are breastfeeding or plan to breastfeed. Lamotrigine may pass to your baby through breast milk. Tell your doctor if your baby has interrupted breathing, poor sucking or unusual sleepiness.
  • Know that this medication can cause sleepiness and/or dizziness. Don’t operate machinery or drive until you know how Lamictal affects you.
  • Know that you may experience changes in your mental health. This medication may cause thoughts of suicide, panic attacks, agitation, new or worsening irritability, restlessness, anxiety, dangerous impulses, depression, insomnia, aggressive behavior, abnormally excited moods and other unusual changes in mood. Tell another person close to you about these symptoms so they can help you look out for them. Tell your doctor right away if you experience changes in mood or mental health.

Please seek the advice of a medical professional before making health care decisions.