Skip to Main Content
Ontario Poison Centre

Hydrogen peroxide

Hydrogen peroxide


Hydrogen peroxide is available in different strengths and in different products. 3% hydrogen peroxide is a common household product that is used as an antiseptic for minor wounds. It is also sometimes used as a whitening agent in products like tooth whitening kits and hair bleach.

Poisoning Risk

Dependent on dose/amount ingested.

Low: unintentional ingestions of diluted or 3% solutions.

High: intentional ingestions, or ingestions of solutions >10%.

Expected Symptoms

  • Bloating of stomach, belching.
  • Possible upset stomach (discomfort, nausea, isolated episode of vomiting or diarrhea).
  • Skin “whitening” or irritation: usually returns to normal after a few hours if it has been washed off.

Home Treatment

  • Dilute with small amount of water or milk to drink.
  • Wash exposed skin with soap and water for several minutes.
  • For eye exposures, rinse eyes for at least 15 minutes with lukewarm water.
  • Call the Poison Centre for further advice.

*Note: stronger hydrogen peroxide >10% can cause more serious symptoms. If swallowed, call the Poison Centre or seek medical attention in your nearest ED right away.


  • This product should be locked up and out of sight with all of your other household hazards.
  • Always keep this product in its original container.
  • Every case is different. OPC is available 24hrs/day to provide information for your individual situation. Call 1-800-268-9017 (Toll-free) or 416-813-5900 (Local).



Back to Top