Child Drank Cough Syrup: Recognizing Dextromethorphan Toxicity and Hallucinations

A child who has swallowed cough syrup may be fine, or may develop a serious poisoning problem. The risk depends on the product, amount swallowed, the child’s age and weight, and whether other medicines are present. Some cough and cold products contain dextromethorphan, a cough suppressant that can cause sleepiness, confusion, agitation, poor coordination, or hallucinations when too much is taken.

If your child has just had an accidental cough medicine overdose child exposure, do not wait for symptoms before getting expert advice. Call your local poison control center promptly. In the United States, Poison Control can be reached at 1-800-222-1222. If the child is difficult to wake, having trouble breathing, having a seizure, or has collapsed, call emergency services immediately.

What is dextromethorphan?

Dextromethorphan is found in many over-the-counter cough medicines. It may appear on the label as “DM” or “DXM.” At the recommended dose, it is generally used to reduce coughing. In larger amounts, it can affect the brain and nervous system.

A cough syrup may also contain other active ingredients, such as:

• Acetaminophen, which can injure the liver in an overdose
• Antihistamines, which may cause severe drowsiness, agitation, fast heartbeat, or seizures
• Decongestants, which can raise heart rate and blood pressure
• Guaifenesin, an expectorant that may cause nausea and vomiting in excess amounts
• Alcohol or other sedating ingredients

Because products differ, the bottle or package is important. Bring it with you or keep it nearby when speaking with a poison specialist or doctor.

Signs of dextromethorphan toxicity

Symptoms can begin within a few hours, but the timing varies depending on the product and amount. A child may first seem unusually sleepy, dizzy, or unsteady. Other possible signs include:

• Nausea or vomiting
• Slurred speech
• Poor balance or difficulty walking
• Blurred or abnormal vision
• Confusion or unusual behavior
• Agitation, restlessness, or irritability
• Fast heartbeat
• Sweating or flushed skin
• Large pupils
• Muscle twitching or unusual muscle stiffness
• Loss of coordination
• Hallucinations or seeing and hearing things that are not there

Hallucinations can be frightening for both the child and caregiver. They may occur with significant dextromethorphan exposure, especially when the child is confused, agitated, or very sleepy. Do not assume that hallucinations are simply a reaction to being scared. They require prompt medical advice.

When to call emergency services

Call emergency services now if your child has any severe or rapidly worsening symptoms, including:

• Trouble breathing, slow breathing, or irregular breathing
• Inability to wake the child normally
• Blue, gray, or very pale lips or skin
• A seizure
• Collapse or loss of consciousness
• Severe agitation, dangerous behavior, or extreme confusion
• Very high body temperature
• Severe muscle stiffness or repeated muscle jerking
• A fast or irregular heartbeat with weakness, fainting, or chest discomfort

These signs may indicate a life-threatening poisoning or a dangerous reaction to another ingredient in the medicine. Speak to a doctor about anything that could be life threatening or serious. Emergency care is safer than trying to monitor severe symptoms at home.

What to do after a child drinks cough syrup

Try to stay calm, but act promptly. Do not punish or frighten the child. Take these steps:

1. Move the medicine away from the child.
2. Check the child’s breathing and level of alertness.
3. Call poison control or a medical professional. Give the child’s age, weight, the product name, concentration, estimated amount, and time of exposure.
4. Keep the bottle, measuring cup, and packaging. A photo of the label may also help if you must leave for medical care.
5. Follow the instructions you receive. Poison specialists may recommend observation at home or evaluation in an emergency department.

Do not make the child vomit. Do not give activated charcoal unless a medical professional specifically tells you to do so. Avoid giving food, milk, or another medicine to “cancel out” the cough syrup unless advised by a clinician. If the child vomits or becomes very sleepy, place them on their side while waiting for help and continue watching their breathing.

If you are unsure what symptoms mean, you might consider a free, online symptom check, using the doctor approved Ubie Symptom Checker. An online tool cannot replace poison control, emergency services, or an in-person medical assessment after a possible overdose.

Why the amount can be difficult to judge

Caregivers often do not know how much syrup was swallowed. Children may drink directly from the bottle, spill some, or take a partial dose. The concentration can also vary between products. “One spoonful” is not a reliable measurement, particularly when a household teaspoon is used.

Never estimate safety from the amount remaining in the bottle alone. Tell poison control what you know, even if the amount is uncertain. They can calculate risk using the product’s ingredients, the child’s weight, and the likely quantity.

A child may appear normal shortly after swallowing the medicine. That does not always mean the exposure is harmless. Some products contain more than one active ingredient, and symptoms may develop later. Follow-up monitoring is important if poison control or a doctor recommends it.

What treatment may involve

Treatment depends on the child’s symptoms and the ingredients involved. Medical staff may monitor breathing, heart rate, blood pressure, temperature, and alertness. They may perform blood tests or an electrocardiogram, particularly if the product contains acetaminophen or medicines that affect the heart.

There is no safe home antidote for dextromethorphan poisoning. In a hospital, clinicians provide supportive care, such as oxygen or fluids, and treat seizures, severe agitation, abnormal heart rhythms, or other complications when needed. Many children recover fully with prompt assessment and appropriate observation, but serious poisoning can occur and should not be managed by guesswork.

Preventing another exposure

After the immediate concern has been addressed, reduce the chance of a repeat event:

• Store cough and cold medicines in a locked cabinet, not just on a high shelf.
• Keep medicines in their original, labeled containers.
• Use the dosing syringe or cup supplied with the product.
• Never call medicine “candy.”
• Do not give a child another person’s medicine or an adult formulation.
• Check combination products to avoid giving the same ingredient twice.
• Dispose of unused or expired medicines safely.
• Teach older children not to take medicine without an adult’s permission.

Cough and cold medicines are not appropriate for every child, and some should not be used in young children without medical advice. When a child has swallowed any amount of a cough medicine—especially a product containing dextromethorphan—contact poison control or a doctor for individualized guidance. If the child has hallucinations, severe drowsiness, breathing problems, seizures, or any concerning change in behavior, seek emergency help immediately.