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Paradichlorobenzene poisoning

Paradichlorobenzene is a white, solid chemical with a very strong odor. Poisoning can occur if you swallow this chemical.

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.

Poisonous Ingredient

Paradichlorobenzene

Where Found

These products contain paradichlorobenzene:

  • Toilet bowl deodorizers
  • Moth repellant
  • Mothballs

Other products may also contain paradichlorobenzene.

Symptoms

Below are symptoms of paradichlorobenzene poisoning in different parts of the body.

EYES, EARS, THROAT, AND MOUTH

  • Burning in mouth

LUNGS AND AIRWAYS

MUSCLES

  • Muscle spasms

NERVOUS SYSTEM

SKIN

STOMACH AND INTESTINES

Home Care

Get medical help right away. Do not make the person throw up unless poison control or a health care provider tells you to.

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, give the person water or milk right away, unless instructed otherwise by poison control or a provider. Do not give water or milk if the person is unconscious (has a decreased level of alertness).

Before Calling Emergency

Have this information ready:

  • Person's age, weight, and condition (for example, is the person awake or alert?)
  • Name of the product
  • Time it was swallowed
  • Amount swallowed

However, do not delay calling for help if this information is not immediately available.

Poison Control

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. This national hotline 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.

You can also get online poison help now at Poisonhelp.org. Just enter the product, poison, or medicine to get expert help.

What to Expect at the Emergency Room

Take the container to the hospital with you, if possible.

Your provider will measure and monitor your vital signs, including temperature, pulse, breathing rate, and blood pressure.

Tests that may be done include:

Treatment may include:

  • Breathing support, including tube through the mouth into the lungs and connected to a breathing machine (ventilator)
  • Fluids through a vein (by IV)
  • Laxatives
  • Medicine to treat symptoms
  • Tube through the mouth into the stomach to wash out the stomach (gastric lavage)

Outlook (Prognosis)

This type of poisoning is usually not life-threatening. Little will likely happen if your child accidentally puts a moth ball in the mouth, even if it is swallowed, unless it causes choking. Mothballs have an irritating smell, which usually keeps people away from them.

More severe symptoms may occur if someone swallows the product on purpose, since larger amounts are commonly swallowed.

Burns in the airway or gastrointestinal tract can lead to tissue necrosis, resulting in infection, shock, and death, even several months after the substance is first swallowed. Scars may form in these tissues, leading to long-term difficulties with breathing, swallowing, and digestion.

References

Dubey D, Sharma VD, Pass SE, Sawhney A, Stüve O. Para-dichlorobenzene toxicity - a review of potential neurotoxic manifestations. Ther Adv Neurol Disord. 2014;7(3):177-187. PMID: 24790648 pubmed.ncbi.nlm.nih.gov/24790648/.

Meehan TJ. Care of the poisoned patient. In: Walls RM, ed. Rosen's Emergency Medicine: Concepts and Clinical Practice. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 135.

National Pesticide Information Center website. Paradichlorobenzene. npic.orst.edu/factsheets/PDBgen.html. Updated December 2010. Accessed November 25, 2025.

Nelson LS, Calello DP. Acute poisoning. In: Goldman L, Cooney KA, eds. Goldman-Cecil Medicine. 27th ed. Philadelphia, PA: Elsevier; 2024:chap 96.

Theobald JL, Corcoran JN. Poisoning. In: Kliegman RM, St. Geme JW, Blum NJ, et al, eds. Nelson Textbook of Pediatrics. 22nd ed. Philadelphia, PA: Elsevier; 2025:chap 94.

Review Date 10/14/2025

Updated by: Jesse Borke, MD, CPE, FAAEM, FACEP, Attending Physician at Kaiser Permanente, Orange County, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

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