Hydrogen peroxide is a liquid commonly used to fight germs. Hydrogen peroxide poisoning occurs when large amounts of the liquid are swallowed or get in the lungs or eyes.
This article is for information only. DO NOT use it to treat or manage an actual poison exposure. If you or someone you are with has an exposure, call the local emergency number (such as 911), or the local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States.
Hydrogen peroxide can be poisonous if it is not used correctly.
Hydrogen peroxide is used in these products:
- Household hydrogen peroxide
- Hair bleach
- Some contact lens cleaners
Note: Household hydrogen peroxide has a 3% concentration. That means it contains 97% water and 3% hydrogen peroxide. Hair bleaches are stronger. They usually have a concentration of more than 6%. Some industrial-strength solutions contain more than 10% hydrogen peroxide.
Symptoms of a hydrogen peroxide poisoning include:
- Abdominal pain and cramping
- Breathing difficulty (if a large amount is swallowed)
- Body aches
- Burns in the mouth and throat (if swallowed)
- Chest pain
- Eye burns (if it gets in the eyes)
- Seizures (rare)
- Stomach swelling
- Temporary white color to the skin
- Vomiting (sometimes with blood)
Seek medical help right away. Do NOT make the person throw up unless poison control or a health care provider tells you to do so. If the chemical is on the skin or in the eyes, flush with lots of water for at least 15 minutes.
Before Calling Emergency
Have this information ready:
- Person's age, weight, and condition
- Name of the product (ingredients and strength, if known)
- Time it was swallowed or got into eyes or on skin
- Amount swallowed, in eyes, or on skin
Your local poison control center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States. This national hotline number will let you talk to experts in poisoning. They will give you further instructions.
This is a free and confidential service. All local poison control centers in the United States use this national number. You should call if you have any questions about poisoning or poison prevention. It does NOT need to be an emergency. You can call for any reason, 24 hours a day, 7 days a week.
What to Expect at the Emergency Room
Take the container with you to the hospital, if possible.
The provider will measure and monitor the person's vital signs, including temperature, pulse, breathing rate, and blood pressure.
Tests that may done include:
- Blood and urine tests
- Chest x-ray
- ECG (electrocardiogram or heart tracing)
- Endoscopy -- camera placed down the throat to check for burns in the esophagus and stomach
Treatment may include:
- Fluids through a vein (by IV)
- Medicines to treat symptoms
- Tube down the throat into the stomach (endoscopy) to relieve gas pressure
- Breathing support, including a tube through the mouth into the lungs and connected to a breathing machine (ventilator)
Most contact with household-strength hydrogen peroxide is fairly harmless. Exposure to industrial-strength hydrogen peroxide can be dangerous. Endoscopy may be required to stop internal bleeding.
Aronson JK. Hydrogen peroxide. In: Aronson JK, ed. Meyler's Side Effects of Drugs. 16th ed. Waltham, MA: Elsevier; 2016:875.
Hoyte C. Caustics. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 148.
Review Date 11/13/2021
Updated by: Jesse Borke, MD, CPE, FAAEM, FACEP, Attending Physician at Kaiser Permanente, Orange County, CA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.