Accidentally Gave Cat Double Dose of Flea Medicine: What to Do Next?




Accidentally Gave Cat Double Dose of Flea Medicine


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In the cat care world, we strive to protect our beloved furry friends from any harm that comes their way. But sometimes disaster strikes, especially with their medicine doses.

So, you accidentally gave your cat a double dose of flea medicine. What should you do? Rest assured that accidental double dosing of flea medicine is generally not life-threatening for cats. Most cats can have double dosage without adverse effects on cats. However, it’s still essential to monitor your cat for any potential signs of discomfort or unusual behavior.

Throughout this article, I’ll share my experience of overdosing on my cat, Muezza. Together, we’ll explore the appropriate steps to take and ensure the well-being of our furry companions.

Accidentally Gave Cat Double Dose of Flea Medicine: How I Overdozed Muezza

Ah, the quest to protect Muezza from those pesky fleas. It all began with good intentions and a touch of absent-mindedness. It was a busy day with endless to-do lists, and Muezza’s well-being was always my top priority. I had entrusted her care to a reliable pet caretaker while I attended to other responsibilities.

Unbeknownst to me, Muezza had already received her scheduled dose of flea medicine from the caretaker earlier in the day. Upon my return, unaware of the previous administration, I decided to take charge and shield Muezza from any potential flea infestations. That’s how he ended up receiving double dosage.

The Consequences of Flea Medicine Double Dosage to a Cat

The Consequences of Flea Medicine Double Dosage to a Cat
Image of Muezza after receiving a double dosage (She was Absolutely fine)

Contrary to the initial panic, accidentally giving your cat a double dose of flea medicine is typically not life-threatening. In Muezza’s case, the double dosage had no noticeable effects on her well-being, much to my relief.

However, it’s crucial to understand that each cat is unique. While Muezza remained unscathed, other cats may experience different consequences. Some potential side effects include the following:

1. Excessive Drooling

Excessive drooling, or hypersalivation, can be triggered by certain ingredients commonly found in flea medicine. These include pyrethroids (such as permethrin and cypermethrin) or pyrethrins.

The chemicals act on the cat’s nervous system, specifically the salivary glands, leading to increased production of saliva.

A cat receiving a double dose of flea medicine containing these ingredients can intensify the salivary response. This will result in excessive drooling.

You can tell your cat has this side effect through a noticeable increase in saliva dripping from its mouth. Do not panic, as drooling is not life-threatening.

2. Allergic Reactions

Allergic reactions in cats may occur in response to various ingredients present in flea medicine. Some ingredients that can lead to allergies include permethrin, imidacloprid, fipronil, or selamectin.

When a cat is exposed to these allergens, their immune system may overreact, leading to various symptoms.

Allergic reactions can manifest as itching, redness, swelling of the face or paws, and the formation of hives. In severe cases, cats may experience staggering tremors, or difficulty breathing, indicating a potentially life-threatening allergic response.

Individual cats may have different sensitivities to these allergens. Some may be more prone to severe reactions than others.

3. Gastrointestinal Disturbances

Gastrointestinal disturbances can occur due to the irritant effects of certain flea medicine ingredients on the stomach lining. Ingredients like imidacloprid, selamectin, or spinosad can cause stomach upset when administered in excessive doses.

Cats may experience vomiting and diarrhea due to these ingredients, especially imidacloprid. This can lead to dehydration if not managed properly.

4. Lethargy and Weakness

Imidacloprid, fipronil, and selamectin are common ingredients in most flea medications. These can affect the central nervous system, potentially leading to lethargy and cat weakness.

These side effects may include a lack of energy, decreased interest in activities, or difficulty in movement. Cats may appear more tired than usual and exhibit reduced strength, making them sleepy after flea treatment. While lethargy and weakness are not life-threatening, they can impact your cat’s overall well-being. 

What to Do After You Accidentally Gave Cat a Double Dose of Flea Medicine?

These are the steps that I took when I realized my mistake, and they worked perfectly. You should follow them to the latter to ensure the comfort of your pet:

1. Stay Calm and Assess the Situation

Take a moment to calm yourself and avoid unnecessary stress. Panicking can make it harder to think clearly and take appropriate action. As a cat owner, I have been through panic times with Muezza.

Taking a moment to calm down and think about what to do
Taking a moment to calm down and think about what to do

Trust me, panic doesn’t help alleviate any situation, so you must calm down first. Understand that this is not a life-threatening situation.

2. Observe Your Cat’s Behavior

Monitoring Muezza for any immediate signs of adverse effects
Monitoring Muezza for any immediate signs of adverse effects

Keep a close eye on your cat’s behavior and monitor for any immediate signs of adverse effects. Watch for excessive drooling, restlessness, vomiting, diarrhea, tremors, or changes in appetite.

However, remember that the absence of these symptoms immediately after the double dosage does not guarantee your cat won’t experience any delayed effects. Note down any observed changes.

3. Provide Fresh Water

Giving fresh water to Muezza
Giving fresh water to Muezza

Ensure your cat has access to fresh water at all times. Drooling will result in increased thirst or dehydration. Having clean water available will help keep your cat hydrated. Monitor their water intake to ensure they are drinking regularly.

4. Do Not Administer Any More Medication

Refrain from administering any additional doses of flea medicine. Also, do not give any other type of medication without explicit guidance from your veterinarian. Adding more medication to the situation can exacerbate any adverse effects your cat may experience.

5. Document the Incident

 Documenting everything that happens to my cat Muezza
 Documenting everything that happens to my cat Muezza

I always document everything that happens to my cat. This is for my future reference in case the incident happens again. So, note down the name and brand of the flea medicine and the active ingredients.

Write down the dosage you gave them and what signs they exhibited. Were they serious or mild? Be sure to note every tiny detail. 

When to Contact a Veterinary Doctor After Giving Your Cat a Double Dose?

When to Contact a Veterinary Doctor

After realizing my mistake, I immediately contacted my veterinarian. The vet reassured me there was no immediate cause for concern and provided guidance on monitoring my cat’s condition.

So, generally, you should not bother to contact a vet. However, there are certain conditions and side effects that need immediate attention.

They include:

1. Immediate Signs of Distress

If you notice any signs of distress in your cat after giving them a double dose of flea medicine, contact a veterinary doctor immediately. Signs of distress include your cat repeatedly vomiting, having severe diarrhea, and struggling to breathe.

The cat will also be drooling excessively, experiencing seizures, or collapsing. These symptoms suggest that something is seriously wrong and require immediate medical attention.

2. Lingering or Worsening Symptoms

Even if your cat seems fine after the double dose, closely monitor their condition. Contact the vet if you observe any lingering or worsening symptoms, such as ongoing vomiting, continued diarrhea, or extreme tiredness.

Also, continued loss of appetite and unusual behavior are concerns that a veterinary doctor must address.

3. Allergic Reactions

The signs of allergic reactions include excessive itching and swelling of the face, lips, or tongue. In extreme cases, the cat will have the presence of hives, difficulty breathing, or pale gums.

Allergic reactions are severe and even life-threatening. Hence, acting quickly and getting professional help to ensure your cat’s well-being is essential.

4. Pre-existing Health Conditions

If your cat has pre-existing health conditions, you must consult a veterinary doctor after a double dose of flea medicine. This is even if no immediate symptoms are evident. Certain health conditions can increase the risk of complications or adverse reactions to medications.

5. Behavioral Changes

Excessive restlessness, agitation, confusion, aggression, or unusual vocalization, indicate the medication affects their behavior. These changes should be discussed with a veterinary doctor.

The professional will determine the underlying cause and the appropriate steps to address potential issues.

6. Lack of Improvement

See a vet if your cat shows initial signs of mild side effects but fails to improve or shows worsening symptoms over time. Lack of improvement or deterioration in symptoms necessitates further investigation. The cat needs supportive care to ensure its well-being and quick recovery. 

Preventing Future Flea Medicine Overdose

Here are some practical tips and advice to help you avoid future incidents:

1. Maintain a Medication Schedule

Maintaining a routine can minimize the chances of accidentally giving your cat a double dose. Consider using reminders or alarms to ensure you stay on schedule.

2. Communicate with Family Members or Pet Sitters

If you share your home with other family members or have pet sitters, communicate clearly about the administration of flea medicine. Consider posting reminders or written instructions in visible areas as a helpful reference. Also, choose one person responsible for medications rather than just anyone. 


Here are answers to some questions that might come up:

1. Can a Double Dose of Flea Medicine Cause Long-term Health Problems in My Cat?

No. It can only lead to temporary side effects, such as drooling. It is unlikely to cause long-term health problems when promptly addressed. Most cats recover without long-term effects, especially if medical attention is sought when necessary.

2. How Long Does it Take for a Cat to Recover From a Double Dose of Flea Medicine?

This varies depending on the individual cat, the specific medication involved, and the severity of the symptoms. Most cats show improvement within a day or two, while others may take longer. If you have any concerns or if your cat’s condition does not improve, consult with a veterinarian.

3. Are There Any Natural Alternatives to Flea Medicine I Can Use for My Cat?

Some natural alternatives for cat flea control include herbal flea food supplements and sprays, essential oils (such as lavender or cedar), and diatomaceous earth. You can also do away with flees through regular grooming with a flea comb. 

grooming Muezza with a flea comb
Grooming Muezza with a flea comb


If you accidentally gave your cat a double dose of flea medicine, just remain calm and take prompt action. While it may cause temporary side effects and discomfort, the situation is not typically life-threatening.

In this case, monitoring your cat closely for any signs is essential. Seek veterinary assistance if the signs are severe.

Remember, prevention is key to avoiding accidental double dosing in the future. So, carefully follow the instructions provided by the manufacturer. Implement preventive measures so this issue doesn’t happen in the future.

About the author

One response to “Accidentally Gave Cat Double Dose of Flea Medicine: What to Do Next?”

  1. Mark Avatar

    Thank you Adnan!
    Such an awesome article and a beautiful cat ☺️ very informative and really good to find because it’s a real story by a real person and their cat. Thank you!! Hope you’re both doing great.

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