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Flea and Tick Medicine Poisoning in Cats
Written By hannah hollinger
Published: 09/03/2016Updated: 10/15/2021
Veterinary reviewed by Michele K.
What is Flea and Tick Medicine Poisoning?
Some flea medication contains ingredients that can be harmful to cats, such as pyrethrins, pyrethroids and permethrins. Cats are more sensitive to these ingredients than dogs, but the poisoning can be harmful to both types of pets.
The effects range from mild to severe, depending on the amount of exposure and condition of your cat. Flea and tick medicine poisoning can be fatal if it is not treated by a veterinarian.
Flea and tick medicine poisoning occurs when your cat has a negative reaction to the medication. The chemicals from the medication disrupt the nervous system and can lead to serious health problems. It is usually found in topical medication that is applied to the neck and back. The chemicals may also be found in medicated power and collars. 
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Average Cost
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Symptoms of Flea and Tick Medicine Poisoning in Cats
You may notice the signs of flea and tick medicine poisoning within the first six hours of exposure. Take your cat to the veterinarian if you notice any of the following symptoms:
  • Drooling
  • Vomiting
  • Diarrhea
  • Unrest
  • Tremors
  • Lethargy
  • Weakness
  • Incoordination
  • Hypothermia
  • Hyperthermia
  • Dyspnea (labored breathing)
  • Seizures
Causes of Flea and Tick Medicine Poisoning in Cats
There are several causes of flea and tick medicine poisoning in cats. The causes of this condition are as follow:
  • Sensitivity to the medicine
  • Medicine clinging to hair coats
  • Unusually low body temperature
  • Overdosing of medication
  • Ingestion of topical medication
  • Medication not being used as directed or for the correct species
  • Close contact to another pet being treated with medication
Diagnosis of Flea and Tick Medicine Poisoning in Cats
The best thing you can do for your cat in the case of poisoning is take them to the veterinarian immediately.
Your veterinarian will start by asking questions about their medical history and the signs they are displaying at home. You can also expect your veterinarian to ask about their exposure to the chemicals. It is important to answer these questions to the best of your knowledge. This will help your veterinarian determine the severity of the situation.
The next step is to give your cat a physical exam to check their current health and rule out other conditions. Expect your veterinarian to order blood work as part of the physical exam. Your veterinarian will use your answers, the cat’s signs, and the test results to make an accurate diagnosis.
It is vital to take your cat to the veterinarian as soon as you notice the signs of flea and tick medicine poisoning. Early detection and treatment can lead to a full recovery for your four-legged friend. 
Treatment of Flea and Tick Medicine Poisoning in Cats
Your veterinarian will treat the flea and tick medicine poisoning as soon as possible. There is a good chance your cat will need to be hospitalized during the treatment. This is done so your veterinarian can keep an eye on their signs and overall health. The good news is your cat may be released from the hospital in just two to three days.
Activated Charcoal
Your veterinarian may give your cat an activated charcoal to help them eliminate ingested chemicals from their body. The activated charcoal removes the chemicals before the condition becomes worse.
Bath With Detergent
Your cat may have been exposed to the chemicals when the medication was applied to their skin. In this case, your veterinarian will bathe your cat using a mild liquid dish soap.
Prescription Medication
Medication may be prescribed to keep the seizures and muscle tremors at bay. Your cat may also need to receive intravenous fluids during their hospital stay.
Constant Monitoring
The medical staff will monitor your cat for several days to ensure they are recovering from the poisoning. This includes monitoring their blood glucose, body temperature, and kidney function. Your cat may need to remain hospitalized until their symptoms fade and their body is functioning normally.

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Recovery of Flea and Tick Medicine Poisoning in Cats
Your cat will be released from the hospital once they have recovered from the flea and tick medicine poisoning. However, the road to recovery does not end when your cat is released from the hospital. It is important to schedule a follow-up appointment so your veterinarian can make sure your cat has recovered from the poisoning and treatment.
You can prevent flea and tick medicine poisoning from happening by using the medication as directed. You should never use medication on your cat that is designed for another animal. It is important to contact your veterinarian before using flea and tick medicine on your cat.   If in doubt, asking your veterinarian for a prescription product that is safe for your cat is best.  
Taking your cat to the veterinarian as soon as you notice the signs can lead to a full recovery. Unfortunately, neurological complications or leaving this condition untreated can be fatal for your cat.
Flea and tick medicine poisoning in cats can be expensive to treat. If you suspect your cat is at risk of flea and tick medicine poisoning, start searching for pet insurance today. Brought to you by Pet Insurer, Wag! Wellness lets pet parents compare insurance plans from leading companies like PetPlan and Embrace. Find the “pawfect” plan for your pet in just a few clicks!
Flea and Tick Medicine Poisoning Average Cost
From 554 quotes ranging from $200 - $3,000
Average Cost
$800
Top
Flea and Tick Medicine Poisoning Questions and Advice from Veterinary Professionals
Domestic cat
Two Months

14 found this helpful

14 found this helpful

My pet has the following symptoms:
Shaky
I accidentally gave my cat flea and tick meds for the next step above her weight limit. What can I do?
Sept. 27, 2020
Answered by Dr. Michele K. DVM
14 Recommendations
Thank you for your question. . I hope that you were able to get care for her. The best thing to do in that situation is always to wash off the medication if you seen any signs of problems, and see a veterinarian. If she is still having problems, It would be best to have your pet seen by a veterinarian, as they can examine them, see what might be going on, and help get treatment if it is appropriate.
Oct. 13, 2020
Was this question and answer helpful?
indoor house cat, long hair
1 year 4 months

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Drooling, Not Drinking Water, More Attention Seeking/Antsy
We first put a Seresto collar on him for 4 days and he didn't seem to react badly, but he did lick it a few times before it was tightened. We took it off before leaving for the weekend. We put Hartz Ultra Guard drops on the other cat and were unable to monitor if he would have licked that application. I noticed drooling when I returned a week later, my partner didn't notice any when he returned earlier by 4 days. I thought it might be his excitement to see me but he isn't drinking water, craves more attention, and doesn't seem to be sleeping as much. Could this be delayed poison effects?
Sept. 26, 2020
Answered by Dr. Michele K. DVM
0 Recommendations
Thank you for your question. I apologize for the delay, this venue is not set up for urgent emails. Those could be signs of a pyrethrin toxicity, yes. It would be best to have your pet seen by a veterinarian, as they can examine them, see what might be going on, and get treatment for them.
Oct. 18, 2020
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Siamese mix
Two Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Diarrhea And Vomiting
My cat has has loose poops for a day and a half (3-5 poops) and puked up a small hair ball last night while I was sleeping. So far she seems fine to me; she’s eating, drinking, playing, and snuggling. This started shortly after a flea and tick treatment of fipronil and methoprene. At what point is do I start to worry? Is there anything I should do to help settle her stomach? bath her? Change her diet?
Sept. 24, 2020
Answered by Dr. Michele K. DVM
0 Recommendations
Thank you for your question. I apologize for the delay, this venue is not set up for urgent emails. I hope that your pet is feeling better. If they are still having problems, It would be best to have your pet seen by a veterinarian, as they can examine them, see what might be going on, and get any testing or treatment taken care of that might be needed.
Oct. 25, 2020
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Domestic shorthair
5 months

11 found this helpful

11 found this helpful

My pet has the following symptoms:
Drooling, Agitation
I applied topical Catego to both of my kittens, one may have gotten some in her mouth. She was running around, drooling, and seemed very upset. I followed instructions for removing and attempted to dry up as much as I could. She has settled down and appears okay, was even playing with the other cat (who was, at most, annoyed by the flea & tick meds). How long should i monitor? What are signs I should be looking out for?
Sept. 5, 2020
Answered by Jessica N. DVM
11 Recommendations
Good afternoon- If she is behaving normally, continuing to eat, drink and play I would recommend continuing to monitor for the next few hours. I wouldn’t expect a toxicity from getting a small amount in her mouth. If any other symptoms develop though it would be a good idea to take her to your veterinarian. Take care!
Sept. 5, 2020
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House cat
Eight Years

2 found this helpful

2 found this helpful

My pet has the following symptoms:
Vomiting
My cat tends to throw up maybe once a day. I gave flea treatment to both cats around 4pm. Cat has thrown up 2 times since
Aug. 3, 2020
Answered by Dr. Michele K. DVM
2 Recommendations
Thank you for your question. Vomiting isn't a common side effect to Advantage, but if your cat continues to vomit, it would be a good idea to have them seen by a veterinarian. You can try offering a bland diet of boiled white chicken and boiled white rice for a day or two and see if that settles your cats' stomach, as well. I hope that all goes well for you cats.
Aug. 3, 2020
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Cat
smoky
8 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Weak
i put pet armor on my cat a week ago he had no signs til saterday he was weak and falling over so i took him to vet monday his kidneys was failing dont know if it was because of flea medicine he had about a week ago or not but i had to put my cat to sleep its so sad.
Bengal
Harryette and Fred
3 Months

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Diarrhea
Lethargy
Seizures
Vomiting
Twitching
Vomit
Advantage for kittens under 4kg and worm treatment (5kg dose as per pet shop recommendation). Caused vomiting, diaorreah, the serious GRAND MAL seizures. First vet said, no there is wide tolerance, its probaly after coincidence. They both started a. The 1.6kg kitten vomited that night, serious diaorreah the next day and seizures. The boy, 2.6kg, same thing just day later. Its 2 weeks later Thousands of dollars spent and 4 vets to prove that as I knew, they were poisoned. And the seizures continue. The little one had 9 in a morning. The vet first gave her Antirobe for mild toxoplasmosis (because it wasn't poisoning of course), this is when the seizures stepped up a level. Then more drugs to stop seizures and she got worse again. Finally found a vet who took her off everything and she is recovering. But, now the bigger boy's seizures are increasing:( more money spent on something totally avoidable. Terrible terrible stuff Advantage. I have had every test under the sun including a CT and it is NOT congenital :(
Orange tabby
Spice
9 Months

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Vomiting
I tried to give her flea medication but it was hard to hold her still. A little went alogn side her neck shoulder blade area. I tried distracting her for an hour but it still looked wet, and she kept trying to groom that area and running away when I went to stop her. I was scared that she licked the area, so I took a damp cloth and wiped the area bac up towards her neck. Sometime later she vomited all her food up and some liquid (a huge amount for her size). Then she drank some water, and then threw that up also. And later she gave a warning meow while sitting by herself. She seems fine now. She is also recovering from an upper respiratory infection so I'm not sure what could be causing the issue.
Domestic longhair
marshmellow
6 Years

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Lethargic
i gave my cat a flea treatment and day 2 stopped eating and is hiding i dont know what to do..any help would be appreciated..this is his only symptom.. i also did my other 2 cats but they are fine. i even tried soft food and he will not eat
Ragdoll
Boe
12 Weeks

0 found this helpful

0 found this helpful

My pet has the following symptoms:
Sleepy
I gave my 12 week old ragdoll kitten a flea treatment called ‘Beaphar Cat & Kitten Flea Spot On Treatment Repels Fleas for 24 Weeks’. It says it can be used on kittens12 weeks and older. I put it in between her shoulder blades as the label instructed. About an hour later I noticed that she seemed very quiet and slept for about three hours which is unlike her. She has since eaten, drunk and used her litter tray. Although she has now perked up and is active again I’m concerned she has had a bad reaction to the treatment. I have spoken to my vets by phone and they said I should just keep on eye on her. Do you think I should take her in to be assessed regardless? Thanks in advance!
Flea and Tick Medicine Poisoning Average Cost
From 554 quotes ranging from $200 - $3,000
Average Cost
$800

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