Benzonatate Side Effects: What's Normal and What's Not

Benzonatate is a prescription cough suppressant that works by numbing the stretch receptors in your lungs. It's been around for decades and is generally well tolerated — but like any medication, it can cause side effects. Knowing what to expect helps you use it safely and know when something needs medical attention.

This guide covers the common and serious side effects of Benzonatate, who should be extra cautious, and practical tips for managing any issues that come up.

What Is Benzonatate? A Quick Overview

Benzonatate (brand names Tessalon and Tessalon Perles) is a non-narcotic antitussive — meaning it suppresses cough without using opioid ingredients. It's available in 100 mg, 150 mg, and 200 mg capsules and is typically taken three times daily as needed. Unlike codeine-based cough medicines, Benzonatate is not a controlled substance and doesn't carry the same risk of dependence.

For a deeper dive into how it works, see our guide on how Benzonatate works. For full prescribing details, check out What Is Benzonatate?

Common Side Effects

Most people who take Benzonatate don't experience significant side effects. When they do occur, they're usually mild and go away on their own. Common side effects include:

• Drowsiness — The most frequently reported side effect. You may feel sleepy or less alert, especially when you first start taking it.
• Headache — Mild headaches can occur and typically respond to over-the-counter pain relievers.
• Dizziness — Some people feel lightheaded, particularly when standing up quickly.
• Nausea or upset stomach — Taking Benzonatate with food can help reduce stomach discomfort.
• Constipation — Staying hydrated and eating fiber-rich foods can help.
• Stuffy nose — Nasal congestion is an occasional side effect.
• Itching or mild rash — If a rash spreads or worsens, contact your doctor.

These side effects are generally manageable and don't require stopping the medication. However, if any of them become bothersome or persistent, talk to your doctor.

Serious Side Effects: When to Call Your Doctor

While rare, Benzonatate can cause serious side effects that need immediate medical attention. Call your doctor or go to the emergency room if you experience:

• Choking sensation or throat numbness — This is a sign that the capsule may have been chewed or dissolved in the mouth rather than swallowed whole. It can lead to dangerous airway complications.
• Chest numbness or pain — Unusual chest sensations should always be evaluated promptly.
• Confusion or hallucinations — CNS effects like confusion or visual disturbances are rare but serious, especially at higher doses.
• Seizures — Most commonly associated with overdose. If someone taking Benzonatate has a seizure, call 911 immediately.
• Severe allergic reaction — Signs include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat. This is a medical emergency.
• Burning in the eyes — An uncommon but documented side effect.

The Critical Safety Rule

The single most important safety point: never chew, crush, suck, or break open a Benzonatate capsule. The medication is a local anesthetic. If it's released in your mouth or throat, it can cause numbness that leads to choking, laryngospasm (throat closing), bronchospasm (airway spasm), and in extreme cases, cardiovascular collapse. Always swallow the capsule whole with a full glass of water.

Specific Populations: Who Should Be Extra Careful

Children

Benzonatate is not approved for children under 10 years old. This is critically important: even 1–2 capsules can be lethal in a young child. The capsules can look like candy, so they must be stored safely out of reach. If a child accidentally swallows Benzonatate, call Poison Control (1-800-222-1222) or 911 immediately.

Pregnant or Breastfeeding Women

The safety of Benzonatate during pregnancy and breastfeeding has not been established. If you're pregnant, planning to become pregnant, or nursing, talk to your doctor before taking it. They can help weigh the risks and benefits or suggest a safer alternative.

Older Adults

Elderly patients may be more sensitive to the drowsiness and dizziness caused by Benzonatate. If you're over 65, start at the lowest effective dose and be cautious about activities that require alertness, like driving.

People With Allergies to Local Anesthetics

Benzonatate is chemically related to Tetracaine and Procaine. If you've had an allergic reaction to these or similar local anesthetics (often used in dental procedures), tell your doctor — Benzonatate may not be safe for you.

How to Manage Common Side Effects

Here are practical strategies for dealing with the most common issues:

• For drowsiness: Take Benzonatate at bedtime if your cough is worse at night. Avoid driving or operating machinery until you know how it affects you. Don't combine it with alcohol, sleeping pills, or other sedating medications.
• For nausea: Take the capsule with a small snack or meal. Avoid taking it on a completely empty stomach.
• For dizziness: Stand up slowly from sitting or lying positions. Stay well hydrated.
• For constipation: Drink plenty of water and eat fruits, vegetables, and whole grains. A mild stool softener can help if needed.
• For headache: Over-the-counter pain relievers like Acetaminophen or Ibuprofen can help. If headaches persist, let your doctor know.

What About Drug Interactions?

Benzonatate can interact with other medications, particularly those that cause drowsiness — including opioids, benzodiazepines, antihistamines, and sleeping pills. The combined sedation can be dangerous. For a full breakdown, read our guide on Benzonatate drug interactions.

Final Thoughts

For most people, Benzonatate is a safe and effective cough suppressant with mild, manageable side effects. The biggest safety concern isn't the side effects themselves — it's making sure you swallow the capsule whole and keep it away from young children.

If you experience anything unusual or concerning while taking Benzonatate, don't hesitate to call your doctor. And if you need to find Benzonatate at a pharmacy near you, Medfinder can help you locate it in stock quickly.