Benzonatate
Benzonatate
Brand names:Tessalon, Tessalon Perles, Zonatuss
A peripherally acting antitussive that anesthetizes stretch receptors in the respiratory passages, lungs, and pleura. Benzonatate is non-narcotic and non-sedating, making it well suited to operational use when cough suppression is needed without CNS effects. Available by prescription as a swallowed soft gelatin capsule.
Pharmacology and Actions
Benzonatate is structurally related to tetracaine and acts as a local anesthetic on the stretch receptors in the alveoli, bronchi, and pleura that trigger the cough reflex. The peripheral mechanism distinguishes benzonatate from centrally acting antitussives like dextromethorphan and codeine. The drug must be swallowed intact; chewing or sucking the capsule releases the active ingredient in the mouth, producing oropharyngeal anesthesia that can cause choking and aspiration.
Indications
- Nonproductive cough from upper respiratory infection
- Chronic cough management
- Cough disruption requiring suppression without CNS sedation
- Alternative to dextromethorphan when CNS effects are undesirable
Absolute Contraindications
- Known benzonatate or tetracaine local anesthetic allergy
- Children under 10 years (fatal toxicity reported with accidental ingestion)
- Patients unable to swallow capsules intact
Precautions and Side Effects
Severe toxicity including death has occurred from accidental pediatric ingestion of even small numbers of capsules; secure from pediatric access. Adult overdose can cause seizures, cardiac arrhythmias, and CNS depression. Chewing or sucking the capsule causes oropharyngeal anesthesia and risk of choking and aspiration. Allergic reactions including bronchospasm and laryngospasm have been reported, particularly in patients with tetracaine sensitivity. Headache, dizziness, and GI upset are common.
Adult Dosing
Pediatric Dosing
CONTRAINDICATED in children under 10 years due to fatal toxicity reports. Use in patients 10 years and older follows adult dosing.
Pharmacokinetics
Peak Effect: PO: 1 to 2 hours
Duration: 3 to 8 hours per dose
Storage and Handling
Store at controlled room temperature (15 to 30 degrees Celsius). Protect from light. Secure from pediatric access. Keep capsules in original container.
Reconstitution:
Soft gelatin capsules (perles) require no reconstitution. Must be swallowed intact.
TCCC and TECC Role
Benzonatate is an alternative to dextromethorphan for operational cough suppression when CNS-sparing antitussive effect is needed. The peripheral mechanism produces no sedation, no CNS effects, and no concern for serotonin syndrome with MAOIs. This makes benzonatate particularly suitable for personnel performing tasks requiring sustained vigilance who need cough suppression without any cognitive trade-off. The prescription-only status and the pediatric toxicity concerns limit its OTC availability and broad deployment use.
Benzonatate is the cough suppressant for the operator who cannot afford any CNS effects. Pilots, snipers, and others performing sustained-vigilance tasks benefit from benzonatate over dextromethorphan when both options are available. The capsule-swallowing requirement is operationally important: do not chew the soft gelatin perles, as the released benzonatate produces oropharyngeal anesthesia and choking risk. The pediatric toxicity is a real concern; secure benzonatate from any pediatric access in shared living quarters.
Chewing, sucking, or breaking benzonatate capsules. The released drug causes immediate oropharyngeal anesthesia with risk of aspiration and choking. The other common error is storing benzonatate where children can access it; the pediatric toxicity from even 1 to 2 capsules can be fatal.
This drug profile is provided as educational reference material for trained medical providers. It is not medical advice, not a substitute for formal training, and not a substitute for current published guidelines or medical direction.
Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances are subject to additional handling, accountability, and documentation requirements per DEA and state law. Always verify dosing, indications, contraindications, and route of administration against current published guidelines and your local protocols before administration.
If this content is being viewed during a medical emergency, call 911 immediately and follow the direction of your local emergency dispatch and medical control. Do not use this reference as a substitute for emergency medical services.
Drug information evolves. Last reviewed dates and source citations are provided for each entry. Confirm currency against the cited source before clinical use.
Penn Tactical Solutions publishes this reference for educational purposes. PTS does not provide medical direction and does not assume responsibility for clinical decisions made in the field. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Educational reference for trained medical providers. Not medical advice. Not a substitute for formal training, current published guidelines, or medical direction. Drug administration is governed by your scope of practice, agency standing orders, medical director protocols, and applicable state and federal regulations. Controlled substances require additional storage, accountability, and documentation per DEA and state law.
In a medical emergency, call 911. This reference is not a substitute for emergency medical services.
Verify dosing, indications, and contraindications against current published guidelines and your local protocols before administration. Confirm content currency against the source citation. Penn Tactical Solutions does not provide medical direction. Clinical responsibility rests with the administering provider, their medical director, and their agency.
Benzonatate
| PO | 100 to 200 mg PO three times daily as needed for cough. Maximum 600 mg/24 hours. Swallow capsules whole; do not chew, break, or suck the capsules. (15 to 20 minutes) |