Boric acid is a dangerous poison. Poisoning from this chemical can be acute or chronic. Acute boric acid poisoning usually occurs when someone swallows powdered roach-killing products that contain the chemical.

Chronic poisoning occurs in those who are repeatedly exposed to boric acid. For example, in the past, boric acid was used to disinfect and treat wounds. Patients who received such treatment over and over again got sick, and some died.

Boric acid

• Antiseptics and astringents
• Medicated powders
• Skin lotions
• Powders to kill roaches
• Some rodent and ant pesticides
• Photography chemicals
• Some paints
• Enamels and glazes
• Glass fiber manufacturing

Note: This list may not be all inclusive.

The main symptoms of boric acid poisoning are blue-green vomit, diarrhea, and a bright red rash on the skin. Other symptoms may include:

• Blisters
• Collapse
• Coma
• Convulsions
• Drowsiness
• Fever
• Lack of desire to do anything
• Low blood pressure
• Significantly decreased urine output (or none)
• Sloughing of skin
• Twitching of facial muscles, arms, hands, legs, and feet

If the chemical is on the skin, remove by washing the area thoroughly.

If the chemical was swallowed, seek medical treatment immediately.

Determine the following information:

• The patient's age, weight, and condition
• The name of the product (ingredients and strengths if known)
• The time it was swallowed
• The amount swallowed

The National Poison Control Center (1-800-222-1222) can be called 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.

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

See: Poison control center - emergency number

The health care provider will measure and monitor the patient's vital signs, including temperature, pulse, breathing rate, and blood pressure. Treatment depends on the individual symptoms. The patient may receive:

• Gastric lavage (stomach pumping)
• Dialysis
• Liquids by mouth or IV

Note: Activated charcoal does not effectively treat (absorb) boric acid.

For infants, the death rate from boric acid poisonings is high. However, boric acid poisoning is considerably rarer than in the past because the substance is no longer used as a disinfectant in nurseries. It is also no longer commonly used in medical preparations. Boric acid is an ingredient in some vaginal suppositories used for yeast infections, although this is NOT a standard treatment.

Ford MD. Clinical Toxicology. 1st ed. Philadelphia, Pa: WB Saunders; 2001:750.

Cain WS. Sensory and associated reactions to mineral dusts: sodium borate, calcium oxide, and calcium sulfate. J Occup Environ Hyg. April 2004; 1(4): 222-36.

Matsuda K Toxicological analyses over the past five years at a single institution. Rinsho Byori.Oct. 2004; 52(10): 819-23.