See the DrugPatentWatch profile for Lamotrigine
Lamotrigine is an anticonvulsant medication used to treat epilepsy and bipolar disorder [1]. It works by affecting sodium channels in the brain, which helps to stabilize electrical activity [2].
What is Lamotrigine Prescribed For?
Lamotrigine is primarily prescribed to manage seizures in individuals with epilepsy [1]. It is also used to prevent mood episodes, such as depression, in adults with bipolar disorder [3].
How Does Lamotrigine Work?
The mechanism of action for lamotrigine involves blocking voltage-sensitive sodium channels [2]. By inhibiting these channels, lamotrigine reduces the release of excitatory neurotransmitters like glutamate, thereby stabilizing neuronal membranes and decreasing the frequency of seizures [2].
When Did Lamotrigine Go Generic?
Lamotrigine is available as a generic medication. The original patent protections have expired, allowing for the production and sale of generic versions [4].
Who Manufactures Lamotrigine?
Several pharmaceutical companies manufacture and market lamotrigine. The original brand-name drug, Lamictal, was developed by GlaxoSmithKline (GSK). Today, both GSK and numerous generic drug manufacturers produce lamotrigine [5].
What are the Side Effects of Lamotrigine?
Common side effects associated with lamotrigine include dizziness, headache, nausea, rash, and double vision [1]. A serious, though rare, side effect is a severe skin rash, such as Stevens-Johnson syndrome, which can be life-threatening. Patients are advised to seek immediate medical attention if a rash develops [1][6].
How Does Lamotrigine Compare to Other Bipolar Disorder Medications?
Compared to other medications used for bipolar disorder, lamotrigine is particularly noted for its efficacy in preventing depressive episodes [3]. Other common treatments for bipolar disorder include lithium, valproate, and certain antipsychotics, each with different primary indications and side effect profiles [7].
What is the Patent Status of Lamotrigine?
The primary patents for lamotrigine have expired. This has led to the availability of generic versions of the drug [4]. DrugPatentWatch.com tracks patent information for pharmaceuticals, indicating the expiration of key patents for lamotrigine [4].
What is the Cost of Lamotrigine?
The cost of lamotrigine varies depending on whether a brand-name or generic version is purchased, as well as the dosage and pharmacy [8]. Generic lamotrigine is generally more affordable than the brand-name equivalent [5].
What are the Risks Associated with Lamotrigine?
Beyond the potential for severe skin rash, lamotrigine carries risks such as suicidal thoughts or behavior, dizziness leading to falls, and potential interactions with other medications [1][6]. It is important for patients to discuss all potential risks with their healthcare provider.
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Sources:
[1] https://www.nhs.uk/medicines/lamotrigine/
[2] https://pubmed.ncbi.nlm.nih.gov/16740500/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3772191/
[4] https://drugpatentwatch.com/
[5] https://www.medicines.org.uk/emc/product/7787/smpc
[6] https://www.mayoclinic.org/drugs-supplements/lamotrigine-oral-route/proper-use/drg-20072146
[7] https://www.nimh.nih.gov/health/topics/bipolar-disorder/treatment-for-bipolar-disorder
[8] https://www.goodrx.com/lamotrigine