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Malathion poisoning

Definition

Malathion is an insecticide, a product used to kill or control bugs. Poisoning may occur if you swallow malathion, handle it without gloves, or do not wash your hands soon after touching it. Large amounts can be absorbed through the skin.

This is for information only and not for use in the treatment or management of an actual poison exposure. If you have an exposure, you should call your local emergency number (such as 911) or the National Poison Control Center at 1-800-222-1222.

Alternative Names

Carbofos poisoning; Compound 4049 poisoning; Cythion poisoning; Fosfothion poisoning; Mercaptothion poisoning

Poisonous Ingredient

Malathion is the poisonous ingredient in these products.

Where Found

Malathion is used in agriculture to kill and control insects on crops and in gardens. The government also uses it to kill mosquitoes in large outdoor areas.

Malathion may also be found in certain products used to kill head lice.

Symptoms

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

AIRWAYS AND LUNGS

  • Chest tightness
  • Difficulty breathing
  • Wheezing
  • Increased airway secretions or mucus
  • No breathing

BLADDER AND KIDNEYS

EYES, EARS, NOSE, AND THROAT

HEART AND BLOOD

  • Low or high blood pressure
  • Slow heart rate
  • In some cases, heart rate may be rapid
  • Weakness

NERVOUS SYSTEM

SKIN

  • Blue lips and fingernails
  • Sweating

STOMACH AND GASTROINTESTINAL TRACT

  • Abdominal cramps
  • Diarrhea
  • Loss of appetite
  • Nausea and vomiting

Home Care

Call the poison control center for treatment information. If malathion is on the skin, wash the area thoroughly for at least 15 minutes.

Throw away all contaminated clothing. Follow instructions from the appropriate agencies for getting rid of hazardous waste. Wear protective gloves when touching contaminated clothing.

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
  • Amount swallowed

Poison Control

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. 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.

People with malathion poisoning will likely be treated by first responders (firefighters, paramedics) who arrive when you call your local emergency number. These responders will decontaminate the person by removing the person's clothes and washing them down with water. The responders will wear protective gear. If the person is not decontaminated before getting to the hospital, emergency room personnel will decontaminate the person and provide other treatment.

The health care provider at the hospital will measure and monitor the person's vital signs, including temperature, pulse, breathing rate, and blood pressure. The person may receive:

  • Blood and urine tests
  • Oxygen
  • Breathing support, including tube through the mouth and connected to a breathing machine (ventilator)
  • Chest x-ray
  • CT (computerized tomography) scan (advanced brain imaging)
  • ECG (electrocardiogram or heart tracing)
  • Intravenous fluids (fluids given through a vein)
  • Medicine to reverse the effects of the poison, which may include atropine or pralidoxime
  • Tube placed down the nose and into the stomach (sometimes)
  • Washing of the skin (irrigation) and eyes, perhaps every few hours for several days

Outlook (Prognosis)

People who continue to improve in the first 4 to 6 hours after receiving medical treatment usually recover. Prolonged treatment often is needed to reverse the poisoning. This may include staying in the hospital intensive care unit and getting long-term therapy. Some effects of the poison may last for weeks or months, or even longer.

Keep all chemicals, cleaners, and industrial products in their original containers and marked as poison, and out of the reach of children. This will reduce the risk of poisoning and overdose.

References

Agency for Toxic Substances and Disease Registry (ATSDR) website. Atlanta, GA: US Department of Health and Human Services, Public Health Service. Toxicological Profile for Malathion. wwwn.cdc.gov/TSP/ToxProfiles/ToxProfiles.aspx?id=522&tid=92. Reviewed March 20, 2014. Accessed August 25, 2021.

Mofenson HC, Caraccio TR, McGuigan M, Greensher J. Medical toxicology. In: Kellerman RD, Rakel DP, eds. Conn's Current Therapy 2022. Philadelphia, PA: Elsevier 2022:1372-1425.

Welker K, Thompson TM. Pesticides. In: Walls RM, Hockberger RS, Gausche-Hill M, eds. Rosen's Emergency Medicine: Concepts and Clinical Practice. 9th ed. Philadelphia, PA: Elsevier; 2018:chap 157.

Last reviewed May 17, 2021 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..

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