Chlorine poisoning

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Chlorine is a chemical that prevents bacteria from growing. Chlorine poisoning occurs when someone swallows or breathes in (inhales) chlorine.

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 your local emergency number (such as 911), or your local poison center can be reached directly by calling the national toll-free Poison Help hotline (1-800-222-1222) from anywhere in the United States.

Poisonous Ingredient

Chlorine reacts with water in and out of the body to form hydrochloric acid and hypochlorous acid. Both are extremely poisonous.

Where Found

Chlorine is present in:

  • Gas released when mixing bleach with some of the powdered cleansing products and ammonia (chloramine gas)
  • Gas released when opening a partially filled industrial container of chlorine tablets that have been sitting for several months (for example, the first opening of a container after a pool has been closed all winter)
  • Mild cleaners
  • Some bleach products
  • Swimming pool water (and tablets used in swimming pool water)

Note: This list may not include all uses and sources of chlorine.


Chlorine poisoning can cause symptoms in many parts of the body:


  • Breathing difficulty (from breathing in the chlorine)
  • Throat swelling (may also cause breathing difficulty)
  • Water filling the lungs (pulmonary edema)


  • Severe change in acid level of the blood (pH balance), which leads to damage in all of the body organs


  • Loss of vision
  • Severe pain in the throat
  • Severe pain or burning in the nose, eyes, ears, lips, or tongue




  • Burns
  • Holes (necrosis) in the skin or tissues underneath
  • Irritation

Home Care

Seek medical help right away. Do not make a person throw up unless told to do so by the poison center or a health care professional.

If the chemical is on the skin or in the eyes, flush with lots of water for at least 15 minutes.

If the chemical was swallowed, immediately give the person water or milk, unless instructed otherwise by a health care provider. Do not give water or milk if the patient is having symptoms (such as vomiting, convulsions, or a decreased level of alertness) that make it hard to swallow.

If the person breathed in the poison, immediately move the person to fresh air.

Before Calling Emergency

Get the following information:

  • Person's age, weight, and condition
  • Name of the product (and ingredients and strengths, if known)
  • Time it was swallowed
  • Amount swallowed

Poison Control

Your local poison 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

The health care provider will measure and monitor the person's vital signs, including temperature, pulse, breathing rate, and blood pressure. Symptoms will be treated as appropriate. The person may receive:

  • Activated charcoal
  • Breathing support, including a tube through the mouth into the lungs, and a breathing machine (ventilator)
  • Bronchoscopy -- camera down the throat to see burns in the airways and lungs
  • Chest x-ray
  • EKG (heart tracing)
  • Endoscopy -- camera down the throat to see burns in the esophagus and the stomach
  • Fluids through a vein (by IV)
  • Medicine (antidote) to reverse the effect of the poison
  • Surgical removal of burned skin (skin debridement)
  • Tube through the mouth into the stomach to empty the stomach (gastric lavage)
  • Washing of the skin (irrigation) -- perhaps every few hours for several days

Outlook (Prognosis)

How well a person does depends on the amount of poison swallowed and how quickly treatment is received. The faster the person gets medical help, the better the chance for recovery.

Swallowing such poisons can have severe effects on many parts of the body.


Agency for Toxic Substances and Disease Registry (ATSDR). 2010. Toxicological profile for chlorine. Atlanta, GA: U.S. Department of Health and Human Services, Public Health Service. Accessed November 21, 2015.

Blanc PD. Acute responses to toxic exposures. In: Broaddus VC, Mason RJ, Ernst JD, et al, eds. Murray & Nadel's Textbook of Respiratory Medicine. 6th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 75.

Levine MD, Zane R. Chemical injuries. In: Marx JA, Hockberger RS, Walls RM, et al, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 8th ed. Philadelphia, PA: Elsevier Saunders; 2014:chap 64.

Version Info

  • Last reviewed on 11/4/2015
  • Jesse Borke, MD, FACEP, FAAEM, Attending Physician at FDR Medical Services/Millard Fillmore Suburban Hospital, Buffalo, NY. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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