Trimethobenzamide Side Effects

It is possible that some side effects of trimethobenzamide may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

For the Consumer

Applies to trimethobenzamide: intramuscular solution, oral capsule

As well as its needed effects, trimethobenzamide may cause unwanted side effects that require medical attention.

If any of the following side effects occur while taking trimethobenzamide, check with your doctor immediately:

Rare
  • Body spasm, with head and heels bent backward and body bowed forward
  • convulsions (seizures)
  • depression
  • shakiness or tremors
  • skin rash
  • sore throat or fever
  • unusual tiredness
  • vomiting (severe or continuing)
  • yellow eyes or skin

Some trimethobenzamide side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

More common
  • Drowsiness
Less common
  • Blurred vision
  • diarrhea
  • dizziness
  • headache
  • muscle cramps

For Healthcare Professionals

Applies to trimethobenzamide: compounding powder, intramuscular solution, oral capsule, rectal suppository

Nervous system

Extrapyramidal reactions to trimethobenzamide have been reported in some patients, the youngest of whom was 2 weeks old. This patient received approximately 300 mg rectally, although the drug is not recommended for newborn infants.

Nervous system adverse effects have included dizziness, drowsiness, headache, disorientation, coma, convulsions, depression of mood, opisthotonus, Parkinson's-like symptoms, trismus, and extrapyramidal symptoms.

Hypersensitivity

Hypersensitivity reactions have included allergic-type skin reactions.

Cardiovascular

Cardiovascular side effects have been reported rarely. Hypotension has been occasionally associated with intramuscular administration in surgical patients.

Psychiatric

Psychiatric side effects have included depression.

Gastrointestinal

Gastrointestinal adverse effects include diarrhea.

Hepatic

Hepatic side effects have included reports of jaundice and hepatotoxicity.

An isolated case report described a 50-year-old white female receiving trimethobenzamide capsules during a study protocol for use as a prophylactic antiemetic. After two days of administration, the patient had become jaundiced and her urine was dark. She felt tired, anorexic and nauseated with mild epigastric pain. A liver scan four days after the episode indicated hepatocellular dysfunction. She denied any other factors which may have contributed to the episode.

Musculoskeletal

Muscle cramps have occurred in some patients.

Hematologic

Hematologic side effects have rarely included blood dyscrasias.

Ocular

Ocular side effects have included reports of blurring of vision.

Dermatologic

The manufacturer recommends giving trimethobenzamide by deep injection into the upper outer quadrant of the gluteal region, and avoiding the escape of the injectable solution along the route, in order to reduce the incidence of side effects at the injection site.

Dermatologic side effects reported following intramuscular injection have included pain, stinging, burning, redness and swelling at the site of injection.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

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