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What is Methylphenidate Poisoning ?

Methylphenidate (also called Ritalin) is an amphetamine related drug that works as a central nervous system stimulator. In humans, it is prescribed most commonly for hyperactivity and attention deficit disorders, but it can also be given to treat mood disorders, fatigue, obesity, and sleep paralysis. In dogs, methylphenidate can be used to treat narcolepsy, cataplexy and some types of hyperactivity, but it is not as safe in dogs as it is in humans and most veterinarians prefer to use drugs with fewer side-effects. Overdose of a dog’s own prescription or ingestion of a medication intended for humans can cause methylphenidate poisoning in dogs. Methylphenidate toxicosis is similar to toxicity from other amphetamine drugs, both legal and illegal.

Dogs have CNS symptoms including tremors, seizures and behavior changes as well as cardiovascular, gastrointestinal, and respiratory problems. One study found that the intensity of symptoms did not always correspond to the amount ingested, so it’s important to get treatment even if the overdose was relatively small. Extended release formulas have been found to be more toxic for dogs than other forms of the drug. Symptoms usually develop quickly, but with slow release drugs they may be drawn out over a period of hours or even days. The veterinarian will be able to reduce absorption and help to make the symptoms less severe. Without treatment, methylphenidate poisoning can quickly be fatal.

Methylphenidate is found in many drugs that are used to treat ADHD and other mood disorders in humans. It can also be prescribed for narcolepsy and hyperactivity in dogs. Side-effects are common and methylphenidate poisoning or toxicosis can have severe life-threatening symptoms.

Methylphenidate Poisoning Average Cost

From 50 quotes ranging from $300 - $6,000

Average Cost

$1,200

Symptoms of Methylphenidate Poisoning in Dogs

These are the symptoms you will notice in a dog with methylphenidate poisoning. Get veterinary treatment immediately.

  • Restlessness
  • Hyperactivity
  • Aggression
  • Panting
  • Vomiting
  • Drooling
  • Diarrhea
  • Increased body temperature (hyperthermia)
  • Tremors
  • Lack of muscle control (ataxia)
  • Increased heart rate (tachycardia)
  • Hypertension
  • Dilated pupils (mydriasis)
  • Abnormal movements like circling or head bobbing
  • Seizures

Types

These are some of the brand-name medications that contain methylphenidate. 

  • Ritalin
  • Concerta
  • Quillivant XR
  • Daytrana

Methylphenidate containing medications are only registered and approved by the FDA for humans, but a veterinarian could legally prescribe them to your dog as an extra label drug.

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Causes of Methylphenidate Poisoning in Dogs

These are the most common risk factors for methylphenidate poisoning.

Accidental overdose (either taking human medication or overdose of a prescribed medication):

  • Intended dose left on the table
  • Bottle left uncapped
  • Dog chewed through the bottle
  • Improper storage

Overuse of a medication prescribed for your dog:

  • Giving more than the prescribed dose
  • Accidentally giving medication twice
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Diagnosis of Methylphenidate Poisoning in Dogs

Methylphenidate poisoning resembles many other types of amphetamine toxicity, so it can be difficult to diagnose symptomatically. It is also very similar to cocaine poisoning, although symptoms will be of somewhat longer duration. The veterinarian will perform a complete physical examination as well as taking blood and urine samples. These can help to rule out infection if you didn’t see the incident and are not sure what is causing your dog’s symptoms. Exposure to medication containing methylphenidate is the easiest way to diagnose the condition, however urinalysis and stomach content samples frequently have evidence of toxicity from amphetamine related drugs. Bloodwork will only be positive if a large amount was ingested.

The veterinarian will need your dog’s complete medical history and a list of current medications, as well as any potential exposure to human medications. If you know what substance your dog ingested, bring the bottle so the veterinarian can identify any potential toxicity. A detailed description of your dog’s symptoms and time of onset may also be helpful.

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Treatment of Methylphenidate Poisoning in Dogs

Initial treatment will focus on reducing absorption. If the poisoning was recent, the veterinarian will induce vomiting and may perform gastric lavage under anesthesia. Activated charcoal may be given which will bind to the drug in the gastrointestinal tract and help to limit absorption into the bloodstream. If you don’t have immediate access to veterinary treatment, calling a poison helpline can be helpful. You will need to tell the agent exactly what you think your dog ingested, as well as give details about your dog’s weight and breed. Don’t induce vomiting unless it is recommended by a professional.

Methylphenidate containing medications are fast acting and typically reach their peak in 1-2 hours. If they are delayed release doses, symptoms may continue to manifest for 8-30 hours depending on the acid content of the urine. The veterinarian will try to reduce the severity of the symptoms during that time by giving IV fluids, controlling body temperature, and monitoring heart rate and blood pressure. Phenothiazines or other anticonvulsants may be given to treat seizures. Cyproheptadine may help with symptoms of agitation and disorientation. Ascorbic acid may be prescribed to increase urine acidity and encourage faster elimination through the urine. Dogs are frequently also sedated. Your dog will need to stay in a veterinary hospital until all systems have returned to normal.

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Recovery of Methylphenidate Poisoning in Dogs

Most dogs will recover from methylphenidate poisoning with treatment, but since the medication is fast acting, fatal symptoms can develop quickly. Avoiding exposure is the best way to manage the condition. Store all medications on a high shelf that your dog can’t access. Separate dog and human medications to avoid confusion and keep all bottles sealed. A dose should be given as soon as it is removed from the bottle. Don’t leave pills on the table where your dog can eat them.

If your dog is prescribed a medication that contains methylphenidate, discuss the dangers and side-effects with a veterinarian. Make sure other treatments have been tried and the drug is really in your dog’s best interest.  Doses should be given at a regularly scheduled time and recorded accurately so there is no double dosing. If you forget a dose, give it as soon as possible, but if it’s too close to the next medication time it’s better to skip a pill than give two at once. Never give your dog extra doses unless it’s specifically recommended by a veterinarian.

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Methylphenidate Poisoning Average Cost

From 50 quotes ranging from $300 - $6,000

Average Cost

$1,200

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Methylphenidate Poisoning Questions and Advice from Veterinary Professionals

Need pet health advice? Ask a vet

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Ask a Vet

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dog-breed-icon

German Shepherd

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1 1/2

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Unknown severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Unknown severity

Has Symptoms

Nothing

It seems she got the machine bottle of my night stand and ate one pill because I found the other

July 12, 2020

Owner

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Dr. Sara O. DVM

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0 Recommendations

hello, So sorry to hear about your dog. This can cause your dog to have a high heart rate and have other issues. If you notice anything abnormal, it would be best to see your vet. They can treat your dog for toxicity. I hope that your dog starts to feel better soon.

July 12, 2020

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Sarge

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German Shepherd Dog

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15 Months

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Mild severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Mild severity

Has Symptoms

S This Fatal? How Long Do W

My 80 lb GS chew through a bottle of methylphenidate. I estimate he ate 350 mg. What is a lethal dose? It's been several hours I just discovered the chewed up bottle

March 17, 2018

Sarge's Owner


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recommendation-ribbon

3320 Recommendations

If you suspect that Sarge consumed 350mg of methylphenidate (Ritalin), at 80lbs we can say he consumed around 4.375mg/lb; the severity of symptoms and toxicity isn’t so much related to the dose but whether or not an extended-release formulation was consumed, one dog in the study in the second link below died after consuming 4.64 mg/lb. I would strongly recommend visiting an Emergency Veterinarian or calling the Pet Poison Helpline for more information regarding specific product information, timeline (very important) among other factors. Regards Dr Callum Turner DVM www.petpoisonhelpline.com/poison/methylphenidate/ www.ncbi.nlm.nih.gov/pubmed/21155683

March 17, 2018

my 70 pound Pit Bull just ate 108mg [two 54mg] of CONCERTA! should i be worried?

July 2, 2018

Cici M.

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Doc

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Labrador Retriever

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5 Years

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Serious severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Serious severity

Has Symptoms

Hyperactivity

Hyper active Lab. Occurs during AKC field trials. I think due to the excitement of the event. Lots of people, guns etc. This is a hard working hard running retriever. He is at the Master level but sometimes he just boils over and forget's everything. Forgets his casting and will occasionally break at the line. He is fine in training and hunting situations. Only occurs during field trials. We have given him xanax with no effect. Considering some kind of ADD medication ? Any idea's would be appreciated. Rick

July 26, 2017

Doc's Owner

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3320 Recommendations

Firstly hyperactivity and hyperkinesis needs to be distinguished, but if the effects are only during certain situations then hyperactivity is most likely. There are some medications which may be useful, but I am not familiar with their use for this purpose; I’ve added a link at the bottom to some useful pages, but it would be best to discuss this with your Veterinarian or a Behaviourist which may be more familiar with this problem. Regards Dr Callum Turner DVMwww.vetary.com/dog/condition/hyperkinesishttp://veterinarynews.dvm360.com/can-hyper-dogs-become-happy-dogs?pageID=6

July 26, 2017

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Scrappy

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Labrador Retriever

dog-age-icon

2 Years

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Mild severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Mild severity

Has Symptoms

None

My 90+ lb Labrador Retriever/ Great Dane mix ate 108mg of Methylphenidate ER (four 27MG pills that spilled on the floor.) He shows no symptoms. Should I be concerned?

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Hunter

dog-breed-icon

Labrador Retriever

dog-age-icon

5 Years

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Fair severity

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0 found helpful

pill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filledpill-rating-filled

Fair severity

Has Symptoms

None

My son dropped his bottle of concerta on the floor spilling a handfull of pills. The dosage is 54 mg.this happened about 1.5 hrs ago. My 95lb lab ate one pill. Should I worry?

Methylphenidate Poisoning Average Cost

From 50 quotes ranging from $300 - $6,000

Average Cost

$1,200

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