Benzocaine / trimethobenzamide Side Effects
For the Consumer
Applies to benzocaine / trimethobenzamide: suppositories
Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur while taking benzocaine / trimethobenzamide:
Dizziness; drowsiness; rectal irritation.
Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); loss of balance; seizures; shuffling walk; uncontrolled movements of the arms or legs; yellowing of the skin or eyes.
For Healthcare Professionals
Applies to benzocaine / trimethobenzamide: rectal suppository
Cardiovascular side effects have included hypotension. It has been occasionally associated with intramuscular administration of trimethobenzamide in surgical patients.[Ref]
Gastrointestinal side effects have included diarrhea.[Ref]
Hematologic side effects have rarely included blood dyscrasias. Methemoglobinemia, characterized by cyanosis, has been reported with the use of benzocaine topical.[Ref]
Hepatic side effects have included hepatotoxicity and jaundice associated with the use of trimethobenzamide.[Ref]
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.[Ref]
Hypersensitivity side effects have included allergic-type skin reactions. Bronchospasm, shock, and anaphylactoid reactions may occur and, in general, have occurred with high plasma levels of the local anesthetic. Parkinson-like symptoms have been reported following the use of trimethobenzamide. These have abated following drug discontinuation, but in some cases treatment may be indicated.[Ref]
Musculoskeletal side effects have included muscle cramps associated with the use of trimethobenzamide.[Ref]
Nervous system side effects have included dizziness, drowsiness, headache, disorientation, convulsions, opisthotonus, Parkinson's-like symptoms, trismus, and extrapyramidal symptoms.[Ref]
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.[Ref]
Psychiatric side effects have included depression.[Ref]
Local side effects have included burning, stinging, tenderness, and sloughing following the use of benzocaine topical. Pain has been reported following the intramuscular administration of trimethobenzamide.[Ref]
Ocular side effects have included blurred vision following the use of trimethobenzamide.[Ref]
1. "Product Information. Tigan (trimethobenzamide)." Monarch Pharmaceuticals Inc, Bristol, TN.
Not all side effects for benzocaine / trimethobenzamide may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
More about benzocaine/trimethobenzamide
- Other brands: Tebamide
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