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Concept
Lamotrigine
Summary
Lamotrigine, sold under the brand name Lamictal among others, is a medication used to treat epilepsy and stabilize mood in bipolar disorder. For epilepsy, this includes focal seizures, tonic-clonic seizures, and seizures in Lennox-Gastaut syndrome. In bipolar disorder, lamotrigine has not been shown to reliably treat acute depression; but for patients with bipolar disorder who are not currently symptomatic, it appears to be effective in reducing the risk of future episodes of depression.
Common side effects include nausea, sleepiness, headache, vomiting, trouble with coordination, and rash. Serious side effects include excessive breakdown of red blood cells, increased risk of suicide, severe skin reaction (Stevens–Johnson syndrome), and allergic reactions, which can be fatal. Concerns exist that use during pregnancy or breastfeeding may result in harm. Lamotrigine is a phenyltriazine, making it chemically different from other anticonvulsants. Its mechanism of action is not clear, but it appears to inhibit release of excitatory neurotransmitters via voltage-sensitive sodium channels and voltage-gated calcium channels in neurons.
Lamotrigine was first marketed in Ireland in 1991, and approved for use in the United States in 1994. It is on the World Health Organization's List of Essential Medicines. In 2020, it was the 62nd most commonly prescribed medication in the United States, with more than 10 million prescriptions.
Lamotrigine is considered a first-line drug for primary generalized tonic-clonic seizures (includes simple partial, complex partial, and secondarily generalized seizures such as focal-onset tonic-clonic seizures). It is also used as an alternative or adjuvant medication for partial seizures, such as absence seizure, myoclonic seizure, and atonic seizures. A 2020 review on the use of lamotrigine as an add-on therapy for drug resistant generalized tonic-clonic seizures was unable to come to conclusions to inform clinical practice.
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