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Benzonatate Side Effects

Medically reviewed by Drugs.com. Last updated on Feb 24, 2023.

Applies to benzonatate: oral capsule, oral capsule liquid filled.

Serious side effects of Benzonatate

Along with its needed effects, benzonatate may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking benzonatate:

Rare

  • Confusion
  • difficult breathing
  • difficulty with speaking
  • seeing things that are not there
  • shortness of breath
  • tightness in the chest
  • wheezing

Get emergency help immediately if any of the following symptoms of overdose occur while taking benzonatate:

Symptoms of overdose

  • Change in consciousness
  • convulsions (seizures)
  • loss of consciousness
  • no blood pressure or pulse
  • restlessness
  • shakiness in the legs, arms, hands, or feet
  • stopping of the heart
  • trembling or shaking of the hands or feet
  • unconsciousness

Other side effects of Benzonatate

Some side effects of benzonatate may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Less common or rare

For Healthcare Professionals

Applies to benzonatate: oral capsule.

General

The most serious side effects reported were bronchospasm, laryngospasm, and cardiovascular collapse.[Ref]

Hypersensitivity

Frequency not reported: Bronchospasm, laryngospasm, cardiovascular collapse, hypersensitivity[Ref]

Nervous system

Frequency not reported: Sedation, headache, dizziness, mental confusion, visual hallucinations.[Ref]

Respiratory

Frequency not reported: Nasal congestion, numbness of the chest[Ref]

Gastrointestinal

Frequency not reported: Constipation, nausea, GI upset[Ref]

Dermatologic

Frequency not reported: Pruritus, skin eruptions[Ref]

Ocular

Frequency not reported: Sensation of burning in the eyes[Ref]

Other

Frequency not reported: Vague "chilly" sensation[Ref]

Frequently asked questions

References

1. "Product Information. Tessalon (benzonatate)." Forest Pharmaceuticals (2001):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer