Tetrabenazine: Difference between revisions

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* Particular caution should be exercised in treating patients with a history of depression or prior suicide attempts or ideation, which are increased in frequency in Huntington's disease. XENAZINE is contraindicated in patients who are actively suicidal, and in patients with untreated or inadequately treated depression.
* Particular caution should be exercised in treating patients with a history of depression or prior suicide attempts or ideation, which are increased in frequency in Huntington's disease. XENAZINE is contraindicated in patients who are actively suicidal, and in patients with untreated or inadequately treated depression.
|fdaLIADAdult=
|fdaLIADAdult===Indications==
* Treatment of chorea associated with Huntington's disease.


|offLabelAdultGuideSupport======Condition1=====
==Dosage==


* Developed by:
'''General Dosing Considerations'''


* Class of Recommendation:
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 XENAXINE that reduces chorea and is tolerated. XENAZINE can be administered without regard to food.


* Strength of Evidence:
'''Individualization of Dose'''


* Dosing Information
The dose of XENAZINE should be individualized.


:* Dosage
''''Dosing Recommendations Up to 50 mg per day''''


=====Condition2=====
The starting dose should be 12.5 mg per day given once in the morning. After one week, the dose should be increased to 25 mg per day given as 12.5 mg twice a day. XENAZINE should be titrated up slowly at weekly intervals by 12.5 mg daily, to allow the identification of a tolerated dose that reduces chorea. If a dose of 37.5 to 50 mg per day is needed, it should be given in a three times a day regimen. The maximum recommended single dose is 25 mg. If adverse events such as akathisia, restlessness, parkinsonism, depression, insomnia, anxiety or sedation occur, titration should be stopped and the dose should be reduced. If the adverse event does not resolve, consideration should be given to withdrawing XENAZINE treatment or initiating other specific treatment (e.g., antidepressants) [see ADVERSE REACTIONS (6.1)].


There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of {{PAGENAME}} in adult patients.
''''Dosing Recommendations Above 50 mg per day''''


<!--Non–Guideline-Supported Use (Adult)-->
Patients who require doses of XENAZINE greater than 50 mg per day should be first tested and genotyped to determine if they are poor metabolizers (PMs) or extensive metabolizers (EMs) by their ability to express the drug metabolizing enzyme, CYP2D6. The dose of XENAZINE should then be individualized accordingly to their status as PMs or EMs.
|offLabelAdultNoGuideSupport======Condition1=====


* Dosing Information
''''Extensive and Intermediate CYP2D6 Metabolizers''''


:* Dosage
Genotyped patients who are identified as extensive (EMs) or intermediate metabolizers (IMs) of CYP2D6, who need doses of XENAZINE above 50 mg per day, should be titrated up slowly at weekly intervals by 12.5 mg daily, to allow the identification of a tolerated dose that reduces chorea. Doses above 50 mg per day should be given in a three times a day regimen. The maximum recommended daily dose is 100 mg and the maximum recommended single dose is 37.5 mg. If adverse events such as akathisia, parkinsonism, depression, insomnia, anxiety or sedation occur, titration should be stopped and the dose should be reduced. If the adverse event does not resolve, consideration should be given to withdrawing XENAZINE treatment or initiating other specific treatment (e.g., antidepressants).


=====Condition2=====
''''Poor CYP2D6 Metabolizers''''


There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of {{PAGENAME}} in adult patients.
In PMs, the initial dose and titration is similar to EMs except that the recommended maximum single dose is 25 mg, and the recommended daily dose should not exceed a maximum of 50 mg.


<!--Pediatric Indications and Dosage-->
'''CYP2D6 Inhibitors'''


<!--FDA-Labeled Indications and Dosage (Pediatric)-->
''''Strong CYP2D6 Inhibitors''''
|fdaLIADPed======Condition1=====


* Dosing Information
Medications that are strong CYP2D6 inhibitors such as quinidine or antidepressants (e.g., fluoxetine, paroxetine) significantly increase the exposure to α-HTBZ and β-HTBZ, therefore, the total dose of XENAZINE should not exceed a maximum of 50 mg and the maximum single dose should not exceed 25 mg [see WARNINGS AND PRECAUTIONS (5.3), DRUG INTERACTIONS (7.1), USE IN SPECIFIC POPULATIONS (8.8), and CLINICAL PHARMACOLOGY (12.3)].


:* Dosage
2.4 Patients with Hepatic Impairment
Because the safety and efficacy of the increased exposure to XENAZINE and other circulating metabolites are unknown, it is not possible to adjust the dosage of XENAZINE in hepatic impairment to ensure safe use. Therefore, XENAZINE is contraindicated in patients with hepatic impairment [see CONTRAINDICATIONS (4), WARNINGS AND PRECAUTIONS (5.16), USE IN SPECIFIC POPULATIONS (8.6), and CLINICAL PHARMACOLOGY (12.3)].


=====Condition2=====
2.5 Discontinuation of Treatment
Treatment with XENAZINE can be discontinued without tapering. Re-emergence of chorea may occur within 12 to 18 hours after the last dose of XENAZINE [see DRUG ABUSE AND DEPENDENCE (9.2)].


There is limited information regarding <i>FDA-Labeled Use</i> of {{PAGENAME}} in pediatric patients.
2.6 Resumption of Treatment
Following treatment interruption of greater than five (5) days, XENAZINE therapy should be re-titrated when resumed. For short-term treatment interruption of less than five (5) days, treatment can be resumed at the previous maintenance dose without titration.


<!--Off-Label Use and Dosage (Pediatric)-->
|offLabelAdultNoGuideSupport=


<!--Guideline-Supported Use (Pediatric)-->
|fdaLIADPed=There is limited information regarding <i>FDA-Labeled Use</i> of {{PAGENAME}} in pediatric patients.
|offLabelPedGuideSupport======Condition1=====


* Developed by:


* Class of Recommendation:
|offLabelPedGuideSupport=There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.


* Strength of Evidence:


* Dosing Information
|offLabelPedNoGuideSupport=There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.


:* Dosage


=====Condition2=====
|clinicalTrials=There is limited information regarding <i>Clinical Trial Experience</i> of {{PAGENAME}} in the drug label.
 
There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.
 
<!--Non–Guideline-Supported Use (Pediatric)-->
|offLabelPedNoGuideSupport======Condition1=====
 
* Dosing Information
 
:* Dosage
 
=====Condition2=====
 
There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.


<!--Contraindications-->
|contraindications=* Condition1


<!--Warnings-->
|warnings=* Description
====Precautions====
* Description
<!--Adverse Reactions-->
<!--Clinical Trials Experience-->
|clinicalTrials=There is limited information regarding <i>Clinical Trial Experience</i> of {{PAGENAME}} in the drug label.
=====Body as a Whole=====




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|postmarketing=There is limited information regarding <i>Postmarketing Experience</i> of {{PAGENAME}} in the drug label.
|postmarketing=There is limited information regarding <i>Postmarketing Experience</i> of {{PAGENAME}} in the drug label.


=====Body as a Whole=====
 




Line 219: Line 189:


<!--Drug Interactions-->
<!--Drug Interactions-->
|drugInteractions=* Drug
|useInPregnancyAUS=There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of {{PAGENAME}} in women who are pregnant.
:* Description
 
<!--Use in Specific Populations-->
|useInPregnancyFDA=* '''Pregnancy Category'''
|useInPregnancyAUS=* '''Australian Drug Evaluation Committee (ADEC) Pregnancy Category'''
 
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of {{PAGENAME}} in women who are pregnant.
|useInLaborDelivery=There is no FDA guidance on use of {{PAGENAME}} during labor and delivery.
|useInLaborDelivery=There is no FDA guidance on use of {{PAGENAME}} during labor and delivery.
|useInNursing=There is no FDA guidance on the use of {{PAGENAME}} with respect to nursing mothers.
|useInNursing=There is no FDA guidance on the use of {{PAGENAME}} with respect to nursing mothers.
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|useInImmunocomp=There is no FDA guidance one the use of {{PAGENAME}} in patients who are immunocompromised.
|useInImmunocomp=There is no FDA guidance one the use of {{PAGENAME}} in patients who are immunocompromised.


<!--Administration and Monitoring-->
 
|administration=* Oral
|administration=* Oral


* Intravenous
 
|monitoring=There is limited information regarding <i>Monitoring</i> of {{PAGENAME}} in the drug label.
|monitoring=There is limited information regarding <i>Monitoring</i> of {{PAGENAME}} in the drug label.


* Description
 


<!--IV Compatibility-->
<!--IV Compatibility-->
|IVCompat=There is limited information regarding <i>IV Compatibility</i> of {{PAGENAME}} in the drug label.
|IVCompat=There is limited information regarding <i>IV Compatibility</i> of {{PAGENAME}} in the drug label.


<!--Overdosage-->
|overdose====Acute Overdose===
====Signs and Symptoms====
* Description
====Management====
* Description


===Chronic Overdose===
|overdose=There is limited information regarding <i>Chronic Overdose</i> of {{PAGENAME}} in the drug label.


There is limited information regarding <i>Chronic Overdose</i> of {{PAGENAME}} in the drug label.


<!--Pharmacology-->


<!--Drug box 2-->
|drugBox=<!--Mechanism of Action-->
|mechAction=*  
|mechAction=*  


<!--Structure-->
|structure=*


: [[File:{{PAGENAME}}01.png|thumb|none|600px|This image is provided by the National Library of Medicine.]]
|structure=


<!--Pharmacodynamics-->
|PD=There is limited information regarding <i>Pharmacodynamics</i> of {{PAGENAME}} in the drug label.
|PD=There is limited information regarding <i>Pharmacodynamics</i> of {{PAGENAME}} in the drug label.


<!--Pharmacokinetics-->
 
|PK=There is limited information regarding <i>Pharmacokinetics</i> of {{PAGENAME}} in the drug label.
|PK=There is limited information regarding <i>Pharmacokinetics</i> of {{PAGENAME}} in the drug label.


<!--Nonclinical Toxicology-->
 
|nonClinToxic=There is limited information regarding <i>Nonclinical Toxicology</i> of {{PAGENAME}} in the drug label.
|nonClinToxic=There is limited information regarding <i>Nonclinical Toxicology</i> of {{PAGENAME}} in the drug label.


<!--Clinical Studies-->
 
|clinicalStudies=There is limited information regarding <i>Clinical Studies</i> of {{PAGENAME}} in the drug label.
|clinicalStudies=There is limited information regarding <i>Clinical Studies</i> of {{PAGENAME}} in the drug label.


<!--How Supplied-->
 
|howSupplied=*
|howSupplied=*
|packLabel=<!--Patient Counseling Information-->
|fdaPatientInfo=There is limited information regarding <i>Patient Counseling Information</i> of {{PAGENAME}} in the drug label.
|fdaPatientInfo=There is limited information regarding <i>Patient Counseling Information</i> of {{PAGENAME}} in the drug label.


<!--Precautions with Alcohol-->
 
|alcohol=* Alcohol-{{PAGENAME}} interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
|alcohol=* Alcohol-{{PAGENAME}} interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.


<!--Brand Names-->
|brandNames=* ®<ref>{{Cite web | title =  | url =  }}</ref>
<!--Look-Alike Drug Names-->
|lookAlike=* A® — B®<ref name="www.ismp.org">{{Cite web  | last =  | first =  | title = http://www.ismp.org | url = http://www.ismp.org | publisher =  | date =  }}</ref>


<!--Drug Shortage Status-->
|drugShortage=
|drugShortage=
}}
}}

Revision as of 15:48, 21 January 2015

Tetrabenazine
Black Box Warning
Adult Indications & Dosage
Pediatric Indications & Dosage
Contraindications
Warnings & Precautions
Adverse Reactions
Drug Interactions
Use in Specific Populations
Administration & Monitoring
Overdosage
Pharmacology
Clinical Studies
How Supplied
Images
Patient Counseling Information
Precautions with Alcohol
Brand Names
Look-Alike Names

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Kiran Singh, M.D. [2]

Disclaimer

WikiDoc MAKES NO GUARANTEE OF VALIDITY. WikiDoc is not a professional health care provider, nor is it a suitable replacement for a licensed healthcare provider. WikiDoc is intended to be an educational tool, not a tool for any form of healthcare delivery. The educational content on WikiDoc drug pages is based upon the FDA package insert, National Library of Medicine content and practice guidelines / consensus statements. WikiDoc does not promote the administration of any medication or device that is not consistent with its labeling. Please read our full disclaimer here.

Black Box Warning

WARNING: DEPRESSION AND SUICIDALITY
See full prescribing information for complete Boxed Warning.
* XENAZINE can increase the risk of depression and suicidal thoughts and behavior (suicidality) in patients with Huntington's disease. Anyone considering the use of XENAZINE must balance the risks of depression and suicidality with the clinical need for control of choreiform movements. Close observation of patients for the emergence or worsening of depression, suicidality, or unusual changes in behavior should accompany therapy. Patients, their caregivers, and families should be informed of the risk of depression and suicidality and should be instructed to report behaviors of concern promptly to the treating physician.
  • Particular caution should be exercised in treating patients with a history of depression or prior suicide attempts or ideation, which are increased in frequency in Huntington's disease. XENAZINE is contraindicated in patients who are actively suicidal, and in patients with untreated or inadequately treated depression.

Overview

Tetrabenazine is a central nervous system agent that is FDA approved for the treatment of chorea associated with Huntington's disease. There is a Black Box Warning for this drug as shown here. Common adverse reactions include Sedation,somnolence, fatigue, insomnia, depression, akathisia, anxiety, nausea.

Adult Indications and Dosage

FDA-Labeled Indications and Dosage (Adult)

Indications

  • Treatment of chorea associated with Huntington's disease.

Dosage

General Dosing Considerations

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 XENAXINE that reduces chorea and is tolerated. XENAZINE can be administered without regard to food.

Individualization of Dose

The dose of XENAZINE should be individualized.

'Dosing Recommendations Up to 50 mg per day'

The starting dose should be 12.5 mg per day given once in the morning. After one week, the dose should be increased to 25 mg per day given as 12.5 mg twice a day. XENAZINE should be titrated up slowly at weekly intervals by 12.5 mg daily, to allow the identification of a tolerated dose that reduces chorea. If a dose of 37.5 to 50 mg per day is needed, it should be given in a three times a day regimen. The maximum recommended single dose is 25 mg. If adverse events such as akathisia, restlessness, parkinsonism, depression, insomnia, anxiety or sedation occur, titration should be stopped and the dose should be reduced. If the adverse event does not resolve, consideration should be given to withdrawing XENAZINE treatment or initiating other specific treatment (e.g., antidepressants) [see ADVERSE REACTIONS (6.1)].

'Dosing Recommendations Above 50 mg per day'

Patients who require doses of XENAZINE greater than 50 mg per day should be first tested and genotyped to determine if they are poor metabolizers (PMs) or extensive metabolizers (EMs) by their ability to express the drug metabolizing enzyme, CYP2D6. The dose of XENAZINE should then be individualized accordingly to their status as PMs or EMs.

'Extensive and Intermediate CYP2D6 Metabolizers'

Genotyped patients who are identified as extensive (EMs) or intermediate metabolizers (IMs) of CYP2D6, who need doses of XENAZINE above 50 mg per day, should be titrated up slowly at weekly intervals by 12.5 mg daily, to allow the identification of a tolerated dose that reduces chorea. Doses above 50 mg per day should be given in a three times a day regimen. The maximum recommended daily dose is 100 mg and the maximum recommended single dose is 37.5 mg. If adverse events such as akathisia, parkinsonism, depression, insomnia, anxiety or sedation occur, titration should be stopped and the dose should be reduced. If the adverse event does not resolve, consideration should be given to withdrawing XENAZINE treatment or initiating other specific treatment (e.g., antidepressants).

'Poor CYP2D6 Metabolizers'

In PMs, the initial dose and titration is similar to EMs except that the recommended maximum single dose is 25 mg, and the recommended daily dose should not exceed a maximum of 50 mg.

CYP2D6 Inhibitors

'Strong CYP2D6 Inhibitors'

Medications that are strong CYP2D6 inhibitors such as quinidine or antidepressants (e.g., fluoxetine, paroxetine) significantly increase the exposure to α-HTBZ and β-HTBZ, therefore, the total dose of XENAZINE should not exceed a maximum of 50 mg and the maximum single dose should not exceed 25 mg [see WARNINGS AND PRECAUTIONS (5.3), DRUG INTERACTIONS (7.1), USE IN SPECIFIC POPULATIONS (8.8), and CLINICAL PHARMACOLOGY (12.3)].

2.4 Patients with Hepatic Impairment Because the safety and efficacy of the increased exposure to XENAZINE and other circulating metabolites are unknown, it is not possible to adjust the dosage of XENAZINE in hepatic impairment to ensure safe use. Therefore, XENAZINE is contraindicated in patients with hepatic impairment [see CONTRAINDICATIONS (4), WARNINGS AND PRECAUTIONS (5.16), USE IN SPECIFIC POPULATIONS (8.6), and CLINICAL PHARMACOLOGY (12.3)].

2.5 Discontinuation of Treatment Treatment with XENAZINE can be discontinued without tapering. Re-emergence of chorea may occur within 12 to 18 hours after the last dose of XENAZINE [see DRUG ABUSE AND DEPENDENCE (9.2)].

2.6 Resumption of Treatment Following treatment interruption of greater than five (5) days, XENAZINE therapy should be re-titrated when resumed. For short-term treatment interruption of less than five (5) days, treatment can be resumed at the previous maintenance dose without titration.

Off-Label Use and Dosage (Adult)

Pediatric Indications and Dosage

FDA-Labeled Indications and Dosage (Pediatric)

There is limited information regarding FDA-Labeled Use of Tetrabenazine in pediatric patients.

Off-Label Use and Dosage (Pediatric)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Tetrabenazine in pediatric patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Tetrabenazine in pediatric patients.

Contraindications

There is limited information regarding Tetrabenazine Contraindications in the drug label.

Warnings

WARNING: DEPRESSION AND SUICIDALITY
See full prescribing information for complete Boxed Warning.
* XENAZINE can increase the risk of depression and suicidal thoughts and behavior (suicidality) in patients with Huntington's disease. Anyone considering the use of XENAZINE must balance the risks of depression and suicidality with the clinical need for control of choreiform movements. Close observation of patients for the emergence or worsening of depression, suicidality, or unusual changes in behavior should accompany therapy. Patients, their caregivers, and families should be informed of the risk of depression and suicidality and should be instructed to report behaviors of concern promptly to the treating physician.
  • Particular caution should be exercised in treating patients with a history of depression or prior suicide attempts or ideation, which are increased in frequency in Huntington's disease. XENAZINE is contraindicated in patients who are actively suicidal, and in patients with untreated or inadequately treated depression.

There is limited information regarding Tetrabenazine Warnings' in the drug label.

Adverse Reactions

Clinical Trials Experience

There is limited information regarding Clinical Trial Experience of Tetrabenazine in the drug label.




Cardiovascular
Digestive
Endocrine
Hematologic and Lymphatic
Metabolic and Nutritional
Musculoskeletal
Neurologic
Respiratory
Skin and Hypersensitivy Reactions
Special Senses
Urogenital
Miscellaneous

Postmarketing Experience

There is limited information regarding Postmarketing Experience of Tetrabenazine in the drug label.



Cardiovascular
Digestive
Endocrine
Hematologic and Lymphatic
Metabolic and Nutritional
Musculoskeletal
Neurologic
Respiratory
Skin and Hypersensitivy Reactions
Special Senses
Urogenital
Miscellaneous

Drug Interactions

There is limited information regarding Tetrabenazine Drug Interactions in the drug label.

Use in Specific Populations

Pregnancy

Pregnancy Category (FDA): There is no FDA guidance on usage of Tetrabenazine in women who are pregnant.
Pregnancy Category (AUS): There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Tetrabenazine in women who are pregnant.

Labor and Delivery

There is no FDA guidance on use of Tetrabenazine during labor and delivery.

Nursing Mothers

There is no FDA guidance on the use of Tetrabenazine with respect to nursing mothers.

Pediatric Use

There is no FDA guidance on the use of Tetrabenazine with respect to pediatric patients.

Geriatic Use

There is no FDA guidance on the use of Tetrabenazine with respect to geriatric patients.

Gender

There is no FDA guidance on the use of Tetrabenazine with respect to specific gender populations.

Race

There is no FDA guidance on the use of Tetrabenazine with respect to specific racial populations.

Renal Impairment

There is no FDA guidance on the use of Tetrabenazine in patients with renal impairment.

Hepatic Impairment

There is no FDA guidance on the use of Tetrabenazine in patients with hepatic impairment.

Females of Reproductive Potential and Males

There is no FDA guidance on the use of Tetrabenazine in women of reproductive potentials and males.

Immunocompromised Patients

There is no FDA guidance one the use of Tetrabenazine in patients who are immunocompromised.

Administration and Monitoring

Administration

  • Oral

Monitoring

There is limited information regarding Monitoring of Tetrabenazine in the drug label.

IV Compatibility

There is limited information regarding IV Compatibility of Tetrabenazine in the drug label.

Overdosage

There is limited information regarding Chronic Overdose of Tetrabenazine in the drug label.

Pharmacology

There is limited information regarding Tetrabenazine Pharmacology in the drug label.

Mechanism of Action

Structure

There is limited information regarding Tetrabenazine Structure in the drug label.

Pharmacodynamics

There is limited information regarding Pharmacodynamics of Tetrabenazine in the drug label.

Pharmacokinetics

There is limited information regarding Pharmacokinetics of Tetrabenazine in the drug label.

Nonclinical Toxicology

There is limited information regarding Nonclinical Toxicology of Tetrabenazine in the drug label.

Clinical Studies

There is limited information regarding Clinical Studies of Tetrabenazine in the drug label.

How Supplied

Storage

There is limited information regarding Tetrabenazine Storage in the drug label.

Images

Drug Images

{{#ask: Page Name::Tetrabenazine |?Pill Name |?Drug Name |?Pill Ingred |?Pill Imprint |?Pill Dosage |?Pill Color |?Pill Shape |?Pill Size (mm) |?Pill Scoring |?NDC |?Drug Author |format=template |template=DrugPageImages |mainlabel=- |sort=Pill Name }}

Package and Label Display Panel

{{#ask: Label Page::Tetrabenazine |?Label Name |format=template |template=DrugLabelImages |mainlabel=- |sort=Label Page }}

Patient Counseling Information

There is limited information regarding Patient Counseling Information of Tetrabenazine in the drug label.

Precautions with Alcohol

  • Alcohol-Tetrabenazine interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

Brand Names

There is limited information regarding Tetrabenazine Brand Names in the drug label.

Look-Alike Drug Names

There is limited information regarding Tetrabenazine Look-Alike Drug Names in the drug label.

Drug Shortage Status

Price

References

The contents of this FDA label are provided by the National Library of Medicine.

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