Ivermectin is a commonly used medication in cats for treating parasitic infections, including ear mites, mange, and heartworms. However, while it is effective, it can also cause side effects, some of which may be severe. Understanding the safety profile of ivermectin and its potential risks is crucial to ensure the health of your cat. This article will guide you through the side effects of ivermectin for cats, helping you understand when it is safe to use and what to watch for when your cat is being treated.

Is Ivermectin Safe for All Cats?

Ivermectin is generally safe when administered correctly, but it is not suitable for all cats. Some breeds, particularly those with a genetic mutation (e.g., the ABCB1 gene mutation), are more sensitive to ivermectin and may experience toxic reactions even at standard doses. Breeds like Collies, Shetland Sheepdogs, and Australian Shepherds are more susceptible to ivermectin toxicity due to this mutation. It’s essential to consult a veterinarian before administering ivermectin to your cat, especially if it belongs to one of these sensitive breeds or has a known health issue.

Common Side Effects of Ivermectin in Cats

Like any medication, ivermectin can cause mild side effects. These are usually temporary and resolve once the medication is discontinued. Common side effects include:

• Vomiting or diarrhea
• Loss of appetite
• Lethargy or weakness
• Drooling
• Tremors or shaking

These side effects are typically short-lived and may occur as the cat’s body adjusts to the medication. However, persistent symptoms should be reported to a veterinarian.

Severe Reactions and Toxicity: Signs to Watch For

In some cases, ivermectin toxicity can occur, especially if the medication is given in too high a dose or if the cat is genetically predisposed to being sensitive to ivermectin. Signs of ivermectin toxicity include:

• Severe lethargy or unresponsiveness
• Tremors or seizures
• Ataxia (loss of coordination)
• Dilated pupils
• Rapid breathing or difficulty breathing
• Coma

If your cat exhibits any of these symptoms, immediate veterinary care is required. Toxicity can be life-threatening, so prompt treatment is essential.

Can Ivermectin Cause Long-term Damage to Cats?

Ivermectin toxicity can cause long-term damage if left untreated, particularly affecting the central nervous system. Severe cases of ivermectin toxicity may lead to irreversible neurological damage or even death. However, with early detection and treatment, most cats recover fully without lasting effects. It’s crucial to monitor your cat closely during treatment and report any concerning symptoms to your vet right away.

How to Minimize Risks When Using Ivermectin

To minimize the risks of side effects and toxicity, follow these guidelines:

1. Always consult a vet before administering ivermectin to ensure it’s the right treatment for your cat.
2. Use the correct dosage: Dosage should be based on your cat’s weight and health status. Never exceed the recommended dose.
3. Monitor your cat: Keep an eye out for any side effects or unusual behavior after administering the medication.
4. Avoid ivermectin use in sensitive breeds: If your cat belongs to a breed that is more sensitive to ivermectin, ask your veterinarian about alternative treatments.
5. Follow vet instructions carefully: Whether you’re treating ear mites, mange, or heartworms, make sure you’re following the dosage instructions and application method as advised by your vet.

Frequently Asked Questions (FAQs)

Can Ivermectin cause vomiting in cats?

Yes, vomiting is a common side effect of ivermectin, especially if your cat’s digestive system reacts to the medication. If vomiting persists or is accompanied by other symptoms, consult your vet.

How long do side effects last?

Side effects of ivermectin usually resolve within a few hours to a couple of days after the medication is stopped. If the symptoms persist beyond this time frame, seek veterinary advice immediately.

Should I stop Ivermectin if my cat shows side effects?

If your cat experiences mild side effects, such as lethargy or mild vomiting, it may be okay to continue treatment, but you should consult your veterinarian for guidance. However, if severe side effects or signs of toxicity are present (e.g., seizures, excessive drooling, or difficulty breathing), you should stop the medication and contact your vet immediately.

References

• VCA Animal Hospitals – Ivermectin Toxicity in Cats
• PetMD – Side Effects of Ivermectin in Cats
• American Veterinary Medical Association – Ivermectin Use in Cats
• ASPCA Animal Poison Control – Ivermectin Toxicity
  

Next Steps

For more detailed information on the proper usage and safety of ivermectin for cats, visit our article on Ivermectin for Cats: Treatment, Dosage, and Safety. If you suspect your cat may be suffering from ivermectin toxicity, seek immediate veterinary help to ensure your pet’s safety.