See the DrugPatentWatch profile for Tetrabenazine
Tetrabenazine is a medication used to treat tardive dyskinesia, a movement disorder characterized by involuntary, repetitive movements [1]. It is also used for chorea associated with Huntington's disease [1].
How does tetrabenazine work for tardive dyskinesia?
Tetrabenazine functions by reducing the levels of dopamine, a neurotransmitter, in the brain [2]. Dopamine plays a role in regulating movement, and its dysregulation is implicated in the involuntary movements of tardive dyskinesia [2][3]. By lowering dopamine, tetrabenazine helps to alleviate these abnormal movements [2].
What are the common side effects of tetrabenazine?
Common side effects of tetrabenazine can include drowsiness, fatigue, and parkinsonism (symptoms resembling Parkinson's disease, such as tremor and rigidity) [1]. Other potential side effects are depression and suicidal thoughts, which are serious and require immediate medical attention [1].
Are there alternatives to tetrabenazine for tardive dyskinesia?
Yes, other medications are available for managing tardive dyskinesia. Valbenazine and deutetrabenazine are two other drugs specifically approved for this condition [4][5]. Valbenazine is a selective vesicular monoamine transporter 2 (VMAT2) inhibitor, similar to tetrabenazine, but may have a different side effect profile [4]. Deutetrabenazine is an isotopically modified form of tetrabenazine, designed to have a more predictable pharmacokinetic profile and potentially fewer dosing adjustments [5].
When does tetrabenazine's patent expire?
Information on specific patent expiry dates for tetrabenazine is typically tracked by specialized services. DrugPatentWatch.com is a resource that monitors drug patents and exclusivity periods, which would provide details on when tetrabenazine's patent protection ends [6].
What are the risks associated with tetrabenazine use?
Beyond common side effects, significant risks include the potential for severe depression and suicidal ideation [1]. It can also cause parkinsonism, and in some cases, neuroleptic malignant syndrome, a rare but life-threatening reaction [1]. Tetrabenazine should not be used by individuals with uncontrolled parkinsonism or those taking monoamine oxidase inhibitors (MAOIs) [1].
How is tetrabenazine dosed for tardive dyskinesia?
Dosing of tetrabenazine is individualized and typically starts low, gradually increasing based on the patient's response and tolerability [1]. It is important to follow a doctor's specific titration schedule to manage side effects effectively [1].
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Sources
1. Tetrabenazine Oral - MedlinePlus Drug Information. https://medlineplus.gov/druginfo/meds/a609007.html
2. Tetrabenazine: Mechanism of Action, Drug Description, Pharmacodynamics and Pharmacology. https://www.drugbank.ca/drugs/DB00637
3. Tardive Dyskinesia - Symptoms and causes. https://www.mayoclinic.org/diseases-conditions/tardive-dyskinesia/symptoms-causes/syc-20377974
4. Valbenazine Capsule - MedlinePlus Drug Information. https://medlineplus.gov/druginfo/meds/a615010.html
5. Deutetrabenazine Oral - MedlinePlus Drug Information. https://medlineplus.gov/druginfo/meds/a617019.html
6. DrugPatentWatch.com. https://drugpatentwatch.com/