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Organophosphate poisoning

Organophosphates and carbamates are insecticides used in agriculture, in the treatment of premises and, in certain old products, against fleas and ticks. They block an enzyme that regulates the transmission of nerve messages. The nerves the...

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Definition Signs Causes Diagnosis Treatment Prevention Complications When to see a vet Prognosis FAQ Sources Affected species

What is it?

Organophosphates and carbamates are insecticides used in agriculture, in the treatment of premises and, in certain old products, against fleas and ticks.

They block an enzyme that regulates the transmission of nerve messages. The nerves then remain permanently activated: the glands secrete constantly, the muscles contract, the nervous system goes into overdrive.

The intoxication is sudden, often spectacular, and quickly becomes life-threatening. It can result from ingestion, but also from simple contact with the skin or inhalation in a treated area.

Key point

Vital emergency. Never make your dog vomit, do not give him anything to eat or drink, and do not apply any treatment on your own initiative. Take the product packaging to a veterinarian immediately.

Commonly observed signs

These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.

Related signs — each one links to its page:

Excessive salivation Vomiting Diarrhea Tremors Seizures Difficulty breathing Staggering gait

The signs often appear quickly, sometimes within tens of minutes.

Profuse salivation, watery eyes, runny nose, uncontrolled urine and stools.

Vomiting, watery diarrhea, abdominal pain.

Pupils very narrow, pinhead.

Muscle tremors, visible contractions under the skin, stiffness, staggering gait.

Difficult, wheezing, congested breathing.

Deep depression, then convulsions and loss of consciousness in severe forms.

The heart may beat abnormally slowly.

When to consult without delay

This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.

Causes and risk factors

Accidental ingestion of an insecticide product, an agricultural concentrate or poisoned bait.

Skin contact during inappropriate antiparasitic treatment, a product intended for another species or a dosage carried out without veterinary advice.

Walking or lying on a freshly treated surface, followed by licking the paws and fur.

Inhalation of vapors in a recently treated room, greenhouse or shed.

Malicious poisonings, unfortunately encountered in certain areas.

A dog can also become poisoned by drinking water from a container that contained a product or by gnawing on an empty container.

Dogs living near agricultural areas or buildings treated against insects.

Dogs left free or searching, likely to find bait.

Use of non-veterinary antiparasitic products, expired, intended for another species or for the environment.

Puppies, elderly dogs and weakened animals, in whom disorders set in more quickly.

Periods for processing crops and disinsection of premises.

Diagnosis and care

Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.

This is a life-threatening emergency: take your dog to a veterinarian immediately, notifying by telephone that you are arriving.

Never make him vomit yourself, do not give him anything to eat or drink, or give him any medication.

Take the product packaging or a photo of the label with you: the exact chemical family directly guides the treatment.

If the product is on the coat, protect your hands, avoid contaminating yourself and report it to the veterinarian upon arrival rather than carrying out an impromptu wash, which may cause more product to penetrate.

Transport the animal calmly, in a ventilated area, without stimulating it.

The diagnosis is based on the context, clinical signs and examination of the pupils; the veterinarian also assesses breathing and heart rate, which guide treatment.

Treatment

The treatment is exclusively veterinary and often takes place in hospital.

Antidotes exist for this family of toxicants and are administered according to the signs presented by the animal, under close monitoring.

The veterinarian controls convulsions and tremors with appropriate treatments.

Decontamination of the coat is carried out in a care facility, with protective equipment and water at a controlled temperature.

Respiratory support, oxygen therapy and perfusion are put in place depending on the severity.

Monitoring continues for several days: certain forms show a relapse of signs after an initial improvement.

Treatment depends on the cause and the animal's condition: it must be determined by a veterinarian. No self-medication.

Prevention

Never treat your dog for fleas or ticks with a product that is not expressly intended for him, nor with a product intended for the environment.

Respect the re-entry times after an insecticide treatment of the house, garden or premises, and ventilate widely.

Keep your dog away during crop treatments and avoid walking along the edge of a freshly treated plot.

Store plant protection products up high, in their original packaging and locked.

Never transfer a product into a drink bottle.

Teach your dog not to pick up anything from the ground during walks.

Possible complications

Respiratory distress due to congestion and paralysis of the breathing muscles.

Prolonged convulsions with nervous after-effects.

Heart rhythm disturbances.

Relapse of signs several days after an initial improvement, described with certain molecules.

Persistent muscle weakness during severe poisoning.

Rapid death in the absence of support.

When to see a veterinarian

Your dog is drooling profusely, trembling, staggering or has pinhead pupils: go to a veterinarian immediately.

It may have been in contact with an insecticide, an agricultural product or a treated premises: consult without waiting for the appearance of the signs.

You treated him with an antiparasitic product and he shows tremors, salivation or vomiting in the hours that follow.

He is having convulsions or is having difficulty breathing: a life-threatening emergency, do not waste time.

You suspect intentional poisoning: consult and keep everything you may have found.

Prognosis

The prognosis depends on the dose received, the route of exposure and especially the speed of treatment.

A dog treated early, before seizures and respiratory problems set in, has a good chance of making a full recovery.

Severe forms, with respiratory distress or prolonged convulsions, remain serious despite treatment.

Prolonged monitoring is warranted, as certain molecules can cause a relapse after improvement.

Frequently asked questions

Can flea products poison my dog?

A veterinary parasiticide suitable for dogs and used correctly is safe. The risk comes from products intended for another species, environmental products applied to the animal, or non-compliant use.

Should I bathe my dog if he has product on his coat?

Report it to the vet and let them do the decontamination. Impromptu washing can cause more product to penetrate and expose yourself. Protect your hands and avoid contact.

How long after exposure do the signs appear?

Often quickly, within an hour to a few hours depending on the route of exposure. But the absence of immediate signs does not exempt you from calling a veterinarian if contact is suspected.

Has my dog recovered because he feels better after a few hours?

Not necessarily. Certain molecules cause a relapse of the disorders several days after an apparent improvement, hence the prolonged monitoring recommended by the veterinarian.