Trimethobenzamide Hydrochloride

Manufacturer
Heritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc. | AVET LIFESCIENCES PRIVATE LIMITED | Heritage Pharma Labs Inc. d/b/a Avet Pharmaceuticals Labs Inc.
Effective date
2023-11-21
Label type
HUMAN PRESCRIPTION DRUG LABEL
Version
6
Source
full-release
Hydrated at
2026-05-31 20:55:24

Label at a glance#

ProductTrimethobenzamide Hydrochloride
Active ingredientTRIMETHOBENZAMIDE HYDROCHLORIDE
Label structure13 sections

Indications and uses

Trimethobenzamide hydrochloride capsules are indicated in adults for the treatment of postoperative nausea and vomiting and for nausea associated with gastroenteritis. Limitation of Use: Trimethobenzamide hydrochloride capsules are not recommended for use in pediatric patients due to the risk of extrapyramidal signs and symptoms and other serious central nervous system (CNS) effects, and the risk of exacerbation o...

Dosage and administration

The recommended adult dosage is 300 mg orally three or four times daily. Select the lowest effective daily dosage and adjust as needed based upon therapeutic response and tolerability. In geriatric patients and/or in patients with renal impairment (creatinine clearance 70 mL/min/1.73m 2 or less), reduce the daily dosage of trimethobenzamide hydrochloride capsules by increasing the dosing interval and adjust as nee...

Storage and handling

Trimethobenzamide hydrochloride capsules are available as a capsule for oral use with an size ‘1’, two-piece purple opaque cap and purple opaque body, hard gelatin capsules, printed in white with “HP” on cap and in white with “180” on body, filled with white to off-white granular powder. Each capsule contains 300 mg of trimethobenzamide hydrochloride. NDC Number Strength Package 23155-180-01 300 mg capsules bottle...

Label contents#

Full prescribing information#

1 INDICATIONS AND USAGE

INDICATIONS & USAGE SECTION

Trimethobenzamide hydrochloride capsules are indicated in adults for the treatment of postoperative nausea and vomiting and for nausea associated with gastroenteritis.

Limitation of Use:

Trimethobenzamide hydrochloride capsules are not recommended for use in pediatric patients due to the risk of extrapyramidal signs and symptoms and other serious central nervous system (CNS) effects, and the risk of exacerbation of the underlying disease in pediatric patients with Reye’s syndrome or other hepatic impairment.

2 DOSAGE AND ADMINISTRATION

DOSAGE & ADMINISTRATION SECTION

2.2 Dosage Adjustment for Geriatric Patients and/or Patients with Renal Impairment

SPL UNCLASSIFIED SECTION

In geriatric patients and/or in patients with renal impairment (creatinine clearance 70 mL/min/1.73m2 or less), reduce the daily dosage of trimethobenzamide hydrochloride capsules by increasing the dosing interval and adjust as needed based upon therapeutic response and tolerability. Monitor renal function [see Use in Specific Populations (8.5, 8.6)].

3 DOSAGE FORMS AND STRENGTHS

DOSAGE FORMS & STRENGTHS SECTION

Capsules: 300 mg trimethobenzamide hydrochloride; size ‘1’, two-piece purple opaque cap and purple opaque body, hard gelatin capsules, printed in white with “HP” on cap and in white with “180” on body, filled with white to off-white granular powder.

4 CONTRAINDICATIONS

CONTRAINDICATIONS SECTION

Trimethobenzamide hydrochloride capsules are contraindicated in patients with known hypersensitivity to trimethobenzamide [see Adverse Reactions (6)].

5 WARNINGS AND PRECAUTIONS

WARNINGS AND PRECAUTIONS SECTION

5.1 Acute Dystonic Reactions and Other Extrapyramidal Symptoms (EPS)

SPL UNCLASSIFIED SECTION

Extrapyramidal symptoms (EPS), manifested primarily as acute dystonic reactions, may occur with trimethobenzamide hydrochloride capsules. Dystonic reactions may include sudden onset of muscular spasms, especially in the head and neck or opisthotonos. Other EPS include laryngospasm, dysphagia, and oculogyric crisis. Involuntary spasms of the tongue and mouth may lead to difficulty in speaking and swallowing. Anticholinergic drugs can be used to treat acute dystonic reactions.

EPS may also include akathisia, restlessness, akinesia, and other parkinsonian-like symptoms (e.g., tremor). Depending on the severity of symptoms, reduce the daily dosage of trimethobenzamide hydrochloride capsules by increasing the dosing interval or discontinue trimethobenzamide hydrochloride capsules [see Dosage and Administration (2.1)].

Avoid trimethobenzamide hydrochloride capsules in patients receiving other drugs that are likely to cause EPS (e.g. antipsychotics) [see Drug Interactions (7.2)].

5.2 Masking of Other Serious Disorders

SPL UNCLASSIFIED SECTION

EPS and other CNS symptoms which can occur in patients treated with trimethobenzamide hydrochloride capsules may be confused with CNS signs of undiagnosed primary disease (e.g., encephalopathy, metabolic imbalance, Reye’s syndrome) [see Warnings and Precautions (5.1, 5.3)]. If CNS symptoms occur, evaluate the risks and benefits of continuing trimethobenzamide hydrochloride capsules for each patient.

5.3 Other CNS Reactions

SPL UNCLASSIFIED SECTION

Other serious CNS adverse reactions such as coma, depression of mood, disorientation, and seizures have been reported with trimethobenzamide hydrochloride capsules administration. The recent use of other drugs that cause CNS depression or EPS symptoms (e.g., alcohol, sedatives, hypnotics, opiates, anxiolytics, antipsychotics, and anticholinergics) may also increase the risk for these serious CNS reactions [see Warnings and Precautions (5.1, 5.5)]. Consider reducing the daily dosage of trimethobenzamide hydrochloride capsules by increasing the dosing interval or discontinuing the drug [see Dosage and Administration (2.1), Drug Interactions (7.1, 7.2)].

5.4 Hepatotoxicity

SPL UNCLASSIFIED SECTION

Trimethobenzamide hydrochloride is potentially hepatotoxic [see Adverse Reactions (6)]. Avoid use of Trimethobenzamide hydrochloride capsules in patients whose signs and symptoms suggest the presence of hepatic impairment. Discontinue trimethobenzamide hydrochloride capsules in patients who develop impaired liver function while taking trimethobenzamide hydrochloride capsules.

5.5 Effects on the Ability to Drive or Operate Machinery

SPL UNCLASSIFIED SECTION

Trimethobenzamide hydrochloride capsules can cause drowsiness and may impair the mental and/or physical abilities required for the performance of hazardous tasks such as driving a motor vehicle or operating machinery [see Warnings and Precautions (5.1, 5.3)]. Concomitant use of other drugs that cause CNS depression or EPS symptoms (e.g., alcohol, sedatives, hypnotics, opiates, anxiolytics, antipsychotics, and anticholinergics) may increase this effect. Either trimethobenzamide hydrochloride or the other interacting drug should be chosen, depending on the importance of the drug to the patient [Drug Interactions (7.1, 7.2)]. Inform patients not to operate motor vehicles or other dangerous machinery until they are reasonably certain that trimethobenzamide hydrochloride capsules does not affect them adversely.

6 ADVERSE REACTIONS

ADVERSE REACTIONS SECTION

The following adverse reactions from voluntary reports or clinical studies have been reported with trimethobenzamide. Because many of these reactions were reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

  • Nervous system disorders: Parkinson-like symptoms, coma, convulsions, opisthotonos, dizziness, drowsiness, headache, [see Warnings and Precautions (5.1, 5.2, 5.3)]
  • Psychiatric disorders: disorientation, depression of mood
  • Eye disorders: blurred vision
  • Hematologic disorders: blood dyscrasias
  • Hepatobiliary disorders: jaundice [see Warnings and Precautions (5.4)]
  • Immune system disorders: hypersensitivity, including angioedema and allergic-type skin reactions
  • Gastrointestinal disorders: diarrhea
  • Musculoskeletal disorders: muscle cramps

7 DRUG INTERACTIONS

DRUG INTERACTIONS SECTION

7.1 Alcohol

SPL UNCLASSIFIED SECTION

Alcohol may increase the CNS depressant effects of trimethobenzamide hydrochloride capsules and may cause drowsiness [see Warnings and Precautions (5.3, 5.5)]. Avoid concomitant use of trimethobenzamide hydrochloride capsules with alcohol.

7.2 Other Drugs that Cause CNS Depression or EPS

SPL UNCLASSIFIED SECTION

The concurrent use of trimethobenzamide hydrochloride capsules with other drugs that cause CNS depression or EPS (e.g., sedatives, hypnotics, opiates, anxiolytics, antipsychotics, and anticholinergics, may potentiate the effects of trimethobenzamide hydrochloride capsules [see Warnings and Precautions (5.1, 5.2, 5.3, 5.5)]. Either trimethobenzamide hydrochloride capsules or the other interacting drug should be chosen, depending on the importance of the drug to the patient. If CNS-acting drugs cannot be avoided, monitor patients for CNS adverse reactions.

8 USE IN SPECIFIC POPULATIONS

USE IN SPECIFIC POPULATIONS SECTION

8.1 Pregnancy

SPL UNCLASSIFIED SECTION

Risk Summary

SPL UNCLASSIFIED SECTION

The limited available data with trimethobenzamide in pregnant women are not sufficient to inform a drug-associated risk for major birth defects and miscarriage. No adverse developmental effect was observed in animal reproduction studies with administration of trimethobenzamide hydrochloride during organogenesis in pregnant rats at doses 0.16 and 0.8 times the recommended human dose (RHD) and in pregnant rabbits at doses 1.6 times the RHD [see Data].

The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.

Data

SPL UNCLASSIFIED SECTION

Animal Data

SPL UNCLASSIFIED SECTION

Reproduction studies with trimethobenzamide hydrochloride were conducted in rats and rabbits following administration of trimethobenzamide hydrochloride during organogenesis and no adverse developmental effect was observed in either species. The only effects observed were an increased percentage of embryonic resorptions or stillborn pups in rats administered 20 mg/kg and 100 mg/kg (0.16 and 0.8 times the RHD of 1200 mg/day, based on body surface area) and increased resorptions in rabbits receiving 100 mg/kg (1.6 times the RHD of 1200 mg/day, based on body surface area). In each study, these adverse effects were attributed to one or two dams.

​8.2 Lactation

SPL UNCLASSIFIED SECTION

Risk Summary

SPL UNCLASSIFIED SECTION

There is no information on the presence of trimethobenzamide in human milk, the effects of trimethobenzamide hydrochloride capsule on the breastfed infant or the effects of trimethobenzamide hydrochloride capsule on milk production. The lack of clinical data during lactation precludes a clear determination of the risk of trimethobenzamide hydrochloride capsules to an infant during lactation; therefore, the developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for trimethobenzamide hydrochloride capsules and any potential adverse effects on the breastfed infant from trimethobenzamide hydrochloride capsules or from the underlying maternal condition.

8.4 Pediatric Use

SPL UNCLASSIFIED SECTION

The safety and effectiveness of trimethobenzamide hydrochloride capsules in pediatric patients has not been established. Trimethobenzamide hydrochloride capsules are not recommended for use in pediatric patients due to the risk of EPS and other serious CNS effects, and the risk of exacerbation of underlying disease in pediatric patients with Reye’s Syndrome, or other hepatic impairment [see Warnings and Precautions (5.1, 5.2, 5.3, 5.4)].

8.5 Geriatric Use

SPL UNCLASSIFIED SECTION

Clinical studies of trimethobenzamide did not include sufficient numbers of patients aged 65 years and over to determine whether they respond differently from younger patients. Although there are studies reported in the literature that included geriatric patients 65 years and older with younger patients, it is not known if there are differences in efficacy or safety parameters for geriatric and non-geriatric patients treated with trimethobenzamide hydrochloride capsules. Trimethobenzamide is excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because geriatric patients are more likely to have decreased renal function, reduce the daily dosage of trimethobenzamide hydrochloride capsules by increasing the dosing interval and adjust as needed based upon therapeutic response and tolerability. Monitor renal function [see Dosage and Administration (2.2), Use in Specific Populations (8.6)].

8.6 Renal Impairment

SPL UNCLASSIFIED SECTION

Trimethobenzamide is eliminated by renal excretion [see Clinical Pharmacology (12.3)]. In patients with renal impairment (creatinine clearance 70 mL/min/1.73m2 or less), reduce the daily dosage by increasing the dosing interval and adjust as needed based upon therapeutic response and tolerability. Monitor renal function [see Dosage and Administration (2.2)].

8.7 Hepatic Impairment

SPL UNCLASSIFIED SECTION

Avoid trimethobenzamide hydrochloride capsules in patients whose signs and symptoms suggest the presence of hepatic impairment due to the risk of hepatotoxicity [see Warnings and Precautions (5.4)]. Discontinue trimethobenzamide hydrochloride capsules in patients who develop impaired liver function while taking trimethobenzamide hydrochloride capsules.

11 DESCRIPTION

DESCRIPTION SECTION

Chemically, trimethobenzamide hydrochloride is N-[p-[2-(dimethylamino)ethoxy]benzyl]-3,4,5-trimethoxybenzamide monohydrochloride. It has a molecular weight of 424.93 and the following structural formula:

chemical-structurechemical-structure

Capsules: Each capsule for oral use contains trimethobenzamide hydrochloride USP equivalent to 300 mg. The capsule has an opaque purple cap marked “HP” and an opaque purple body marked “180”. The inactive ingredients are lactose monohydrate, magnesium stearate, and corn starch. The capsule shell contains the following ingredients: gelatin, titanium dioxide, D&C Red No. 28, and FDC Blue No. 1, and sodium lauryl sulfate.

White ink contains the following ingredients: Shellac, dehydrated alcohol, isopropyl alcohol, butyl alcohol, propylene glycol, ammonium hydroxide, potassium hydroxide and titanium dioxide.

12 CLINICAL PHARMACOLOGY

CLINICAL PHARMACOLOGY SECTION

12.1 Mechanism of Action

SPL UNCLASSIFIED SECTION

The mechanism of action of trimethobenzamide as determined in animals is obscure, but may involve the chemoreceptor trigger zone (CTZ), an area in the medulla oblongata through which emetic impulses are conveyed to the vomiting center; direct impulses to the vomiting center apparently are not similarly inhibited. In dogs pretreated with trimethobenzamide HCl, the emetic response to apomorphine is inhibited, while little or no protection is afforded against emesis induced by intragastric copper sulfate.

12.3 Pharmacokinetics

SPL UNCLASSIFIED SECTION

Absorption

SPL UNCLASSIFIED SECTION

The pharmacokinetics of trimethobenzamide in healthy adult subjects were compared when trimethobenzamide hydrochloride capsule was administered as a 300 mg oral capsule or a 200 mg (100 mg/mL) intramuscular injection. The time to reach maximum plasma concentration (Tmax) was about 30 minutes after intramuscular injection compared to about 45 minutes after oral capsule administration. The plasma concentration-time profile of trimethobenzamide was similar between the two formulations.

Elimination

SPL UNCLASSIFIED SECTION

The mean elimination half-life of trimethobenzamide is 7 to 9 hours.

Metabolism

SPL UNCLASSIFIED SECTION

The major pathway of trimethobenzamide metabolism is through oxidation resulting in the formation of trimethobenzamide N-oxide metabolite. The pharmacologic activity of this major metabolite has not been evaluated.

Excretion

SPL UNCLASSIFIED SECTION

Between 30 to 50% of a single dose in humans is excreted unchanged in the urine within 48 to 72 hours.

Specific Populations

SPL UNCLASSIFIED SECTION

Sex

SPL UNCLASSIFIED SECTION

Systemic exposure to trimethobenzamide was similar between men (N=40) and women (N=28). Following a single 300 mg capsule oral administration, the respective mean (SD) Cmax of trimethobenzamide were 3.5 (1.1) and 4.2 (1.6) micrograms/mL in male and female subjects. The respective mean (SD) of AUC0-∞ of trimethobenzamide were 10 (2.7) and 10.4 (2.7) micrograms×hour/mL in male and female subjects.

Race

SPL UNCLASSIFIED SECTION

Pharmacokinetics appeared to be similar for Caucasians (N=53) and African Americans (N=12). Following a single 300 mg capsule oral administration, the respective mean (SD) Cmax of trimethobenzamide was 3.8 (1.3) micrograms/mL in Caucasians and 3.9 (1.7) micrograms/mL in African Americans. The respective mean (SD) AUC0-∞ of trimethobenzamide was 10.4 (2.8) micrograms×hour/mL in Caucasians and 9.8 (2.5) micrograms×hour/mL in African Americans.

​16 HOW SUPPLIED/STORAGE AND HANDLING

HOW SUPPLIED SECTION

Trimethobenzamide hydrochloride capsules are available as a capsule for oral use with an size ‘1’, two-piece purple opaque cap and purple opaque body, hard gelatin capsules, printed in white with “HP” on cap and in white with “180” on body, filled with white to off-white granular powder. Each capsule contains 300 mg of trimethobenzamide hydrochloride.

NDC Number

Strength

Package

23155-180-01

300 mg capsules

bottles of 100

Store at 20° to 25°C (68° to 77°F); excursions permitted between 15° to 30°C (59° to 86°F) [See USP Controlled Room Temperature].

17 PATIENT COUNSELING INFORMATION

PATIENT COUNSELING INFORMATION

Inform patients that trimethobenzamide hydrochloride capsules can cause serious adverse reactions. Instruct patients to discontinue trimethobenzamide hydrochloride capsules and contact a healthcare provider immediately if the following serious reactions occur:

  • Acute Dystonic Reactions and Other Extrapyramidal Symptoms [see Warnings and Precautions (5.1)]
  • Other CNS Reactions [see Warnings and Precautions (5.2, 5.3)]
  • Hepatotoxicity [see Warnings and Precautions (5.4)]

Effects on the Ability to Drive or Operate Machinery

Advise patients that trimethobenzamide hydrochloride capsules can cause drowsiness and may impair their judgment, thinking, or motor skills required for tasks such as driving a motor vehicle or operating machinery. Inform patients not to operate motor vehicles or other dangerous machinery until they are reasonably certain that trimethobenzamide hydrochloride capsules do not affect them adversely [see Warnings and Precautions (5.5)].

Drug Interactions

Inform patients that use of alcohol or concomitant treatment with other CNS-acting drugs can precipitate or worsen CNS depression and/or EPS [see Drug Interactions (7.1, 7.2)]. Instruct patients avoid alcohol and to tell their health care providers when they start taking any concomitant medication.

Distributed by:

Avet Pharmaceuticals Inc.

East Brunswick, NJ 08816

1.866.901.DRUG (3784)

avet-logoavet-logo

51U000000428US01

Revised: 02/2023

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL - 300 mg

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL

NDC 23155-180-01

​Trimethobenzamide Hydrochloride Capsules, USP

300 mg

100 Capsules

Rx Only

300mg-100s300mg-100s

DailyMed RxNorm Mappings#

RxCUI, RxNorm string, TTY table
RxCUIRxNorm stringTTYSPL version
860771trimethobenzamide HCl 300 MG Oral CapsulePSN6
860771trimethobenzamide hydrochloride 300 MG Oral CapsuleSCD6

DailyMed Pharmacologic Classes#

Class, Version, Type table
ClassVersionTypeEffective
TRIMETHOBENZAMIDE Pharmacologic Class Indexing2Indexing - Pharmacologic Class20180813

DailyMed Product Concepts#

Product concept, Relation, Version table
Product conceptRelationVersionEffective
5cb11add-3f77-4e14-9823-b8ca5e31d965Product name120250804

DailyMed Package Descriptions#

Package NDC, Product, Description table
Package NDCProductDescriptionFormQuantityStrengthSPL version
23155-180-01Trimethobenzamide Hydrochloride100 in 1 BOTTLECAPSULE1006

DailyMed Dashboard NDC Coverage#

NDC, Dashboard title, SPL version table
NDCDashboard titleSPL versionValidationDashboard ZIP
23155-180TRIMETHOBENZAMIDE HYDROCHLORIDE CAPSULE [HERITAGE PHARMACEUTICALS INC. D/B/A AVET PHARMACEUTICALS INC.]6Current NDC, 1 package rows20231122_b0aa9b7e-bbe7-482e-81d3-d9658d5ac21f.zip

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NDC Codes#

Product NDC, Package NDC table
Product NDCPackage NDC
23155-18023155-180-01

Ingredients#

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Source XML

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Application-product, Trade name, Ingredient table
Application-productTrade nameIngredientStrengthDosage form / routeTE codesRLD / RSApproval date
A205950-001TRIMETHOBENZAMIDE HYDROCHLORIDETRIMETHOBENZAMIDE HYDROCHLORIDE300MGCAPSULE / ORALABRS2023-11-21

Therapeutic equivalence codes#

Current TE-code rows page 1 of 1 · 1 matching rows.

Application-product, TE code table
Application-productTE code
A205950-001AB

Observed Orange Book product history#

Observed FDA ZIP history: Each table is queried independently by exact application/product key from successfully parsed Orange Book snapshots. Capture times identify archived source observations; absence or a change between snapshots is not inferred. FDA publication files that were not recoverable as structured ZIP data are not represented as states.

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Observed Orange Book normalized TE history#

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2024-08-13 05:28 UTC · 3 captures of this ZIP2024-08A205950-001AB179d66fd596c7…
2024-07-13 05:37 UTC · 2 captures of this ZIP2024-07A205950-001AB1301d65b070ca…
2024-06-18 03:08 UTC · 5 captures of this ZIP2024-06A205950-001AB11e350fbaab3a…
2024-05-31 18:47 UTC2024-05A205950-001AB18072bd15b7f6…
2024-03-16 18:09 UTC · 4 captures of this ZIP2024-03A205950-001AB16a51e52b5d6a…
2024-02-18 07:12 UTC2024-02A205950-001AB11c564ffb4f44…
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Brand, Generic, Manufacturer table
BrandGenericManufacturerSPL set IDEffective dateAvailable safety fieldsJoin
Trimethobenzamide HydrochlorideTRIMETHOBENZAMIDE HYDROCHLORIDEHeritage Pharmaceuticals Inc. d/b/a Avet Pharmaceuticals Inc.b0aa9b7e-bbe7-482e-81d3-d9658d5ac21f2023-11-21Warnings, Adverse reactionsExact identifier
ndc (package): 23155-180-01
ndc (product): 23155-180
ndc11 (package): 23155018001
spl id: 0b8a6f4d-f844-41f5-9659-ec3989cfc390
spl set id: b0aa9b7e-bbe7-482e-81d3-d9658d5ac21f

Reported adverse events (FAERS/openFDA)#

Adverse event summaries are temporarily unavailable. Other product information remains available.