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Xenazine
Overview
What is Xenazine?
XENAZINE (tetrabenazine) is a monoamine depletor for oral administration. The molecular weight of tetrabenazine is 317.43; the pKa is 6.51. Tetrabenazine is a hexahydro-dimethoxy-benzoquinolizine derivative and has the following chemical name: cis rac –1,3,4,6,7,11b-hexahydro-9,10-dimethoxy-3-(2-methylpropyl)-2H-benzo[a]quinolizin-2-one.
The empirical formula CHNOis represented by the following structural formula:
Tetrabenazine is a white to slightly yellow crystalline powder that is sparingly soluble in water and soluble in ethanol.
Each XENAZINE (tetrabenazine) tablet contains either 12.5 or 25 mg of tetrabenazine as the active ingredient.
XENAZINE (tetrabenazine) tablets contain tetrabenazine as the active ingredient and the following inactive ingredients: lactose, magnesium stearate, maize starch, and talc. The 25 mg strength tablet also contains yellow iron oxide as an inactive ingredient.
XENAZINE (tetrabenazine) tablets are supplied as a yellowish-buff, scored tablet containing 25 mg of tetrabenazine or as a white, non-scored tablet containing 12.5 mg of tetrabenazine.
What does Xenazine look like?
What are the available doses of Xenazine?
Tablets: 12.5 mg non-scored and 25 mg scored ()
What should I talk to my health care provider before I take Xenazine?
Pregnancy: Based on animal data, may cause fetal harm. ()
How should I use Xenazine?
XENAZINE is indicated for the treatment of chorea associated with Huntington's disease.
The chronic daily dose of XENAZINE used to treat chorea associated with Huntington's disease (HD) is determined individually for each patient. When first prescribed, XENAZINE therapy should be titrated slowly over several weeks to identify a dose of XENAZINE that reduces chorea and is tolerated. XENAZINE can be administered without regard to food
What interacts with Xenazine?
Sorry No Records found
What are the warnings of Xenazine?
Sorry No Records found
What are the precautions of Xenazine?
Sorry No Records found
What are the side effects of Xenazine?
Sorry No records found
What should I look out for while using Xenazine?
XENAZINE is contraindicated in patients:
What might happen if I take too much Xenazine?
Three episodes of overdose occurred in the open-label trials performed in support of registration. Eight cases of overdose with XENAZINE have been reported in the literature. The dose of XENAZINE in these patients ranged from 100 mg to 1 g. Adverse reactions associated with XENAZINE overdose include acute dystonia, oculogyric crisis, nausea and vomiting, sweating, sedation, hypotension, confusion, diarrhea, hallucinations, rubor, and tremor.
Treatment should consist of those general measures employed in the management of overdosage with any CNS-active drug. General supportive and symptomatic measures are recommended. Cardiac rhythm and vital signs should be monitored. In managing overdosage, the possibility of multiple drug involvement should always be considered. The physician should consider contacting a poison control center on the treatment of any overdose.
How should I store and handle Xenazine?
Store at 25ºC (77ºF); excursions permitted to 15° to 30ºC (59° to 86ºF) [see USP Controlled Room Temperature].Clindamycin palmitate HCl for oral solution, USP (pediatric) is a white to off-white powder forming a clear colorless cherry flavored solution upon constitution with water. When reconstituted as directed, each bottle yields 100 mL of solution containing 75 mg of clindamycin per 5 mL (NDC 65162-468-19). Rx onlyClindamycin palmitate HCl for oral solution, USP (pediatric) is a white to off-white powder forming a clear colorless cherry flavored solution upon constitution with water. When reconstituted as directed, each bottle yields 100 mL of solution containing 75 mg of clindamycin per 5 mL (NDC 65162-468-19). Rx onlyClindamycin palmitate HCl for oral solution, USP (pediatric) is a white to off-white powder forming a clear colorless cherry flavored solution upon constitution with water. When reconstituted as directed, each bottle yields 100 mL of solution containing 75 mg of clindamycin per 5 mL (NDC 65162-468-19). Rx only
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
The precise mechanism by which XENAZINE (tetrabenazine) exerts its anti-chorea effects is unknown but is believed to be related to its effect as a reversible depletor of monoamines (such as dopamine, serotonin, norepinephrine, and histamine) from nerve terminals. Tetrabenazine reversibly inhibits the human vesicular monoamine transporter type 2 (VMAT2) (K ≈ 100 nM), resulting in decreased uptake of monoamines into synaptic vesicles and depletion of monoamine stores. Human VMAT2 is also inhibited by dihydrotetrabenazine (HTBZ), a mixture of α-HTBZ and β-HTBZ. α- and β-HTBZ, major circulating metabolites in humans, exhibit high binding affinity to bovine VMAT2. Tetrabenazine exhibits weak binding affinity at the dopamine D2 receptor (K = 2100 nM).
Non-Clinical Toxicology
XENAZINE is contraindicated in patients:Patients with Huntington's disease are at increased risk for depression, suicidal ideation or behaviors (suicidality). XENAZINE increases the risk for suicidality in patients with HD.
In a 12-week, double-blind, placebo-controlled study in patients with chorea associated with Huntington's disease, 10 of 54 patients (19%) treated with XENAZINE were reported to have an adverse event of depression or worsening depression compared to none of the 30 placebo-treated patients. In two open-label studies (in one study, 29 patients received XENAZINE for up to 48 weeks; in the second study, 75 patients received XENAZINE for up to 80 weeks), the rate of depression/worsening depression was 35%.
In all of the HD chorea studies of XENAZINE (n=187), one patient committed suicide, one attempted suicide, and six had suicidal ideation.
When considering the use of XENAZINE, the risk of suicidality should be balanced against the need for treatment of chorea. All patients treated with XENAZINE should be observed for new or worsening depression or suicidality. If depression or suicidality does not resolve, consider discontinuing treatment with XENAZINE.
Patients, their caregivers, and families should be informed of the risks of depression, worsening depression, and suicidality associated with XENAZINE, and should be instructed to report behaviors of concern promptly to the treating physician. Patients with HD who express suicidal ideation should be evaluated immediately.
The following serious adverse reactions are described below and elsewhere in the labeling:
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
While we update our database periodically, we cannot guarantee it is always updated to the latest version.
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Clonazepam Description Each single-scored tablet, for oral administration, contains 0.5 mg, 1 mg, or 2 mg Clonazepam, USP, a benzodiazepine. Each tablet also contains corn starch, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and povidone. Clonazepam tablets USP 0.5 mg contain Yellow D&C No. 10 Aluminum Lake. Clonazepam tablets USP 1 mg contain Yellow D&C No. 10 Aluminum Lake, as well as FD&C Blue No. 1 Aluminum Lake. Chemically, Clonazepam, USP is 5-(o-chlorophenyl)-1,3-dihydro-7-nitro-2H-1,4-benzodiazepin-2-one. It is a light yellow crystalline powder. It has the following structural formula: C15H10ClN3O3 M.W. 315.72Tips
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Interactions
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