Behaviour change after Ivermectin (Heartgard) in cats
32 reports to the FDA describe behaviour change in cats given Ivermectin. That is 3.3% of all reports for this medicine, compared with 5.4% across reports for all cat medicines, so it is reported less often than average with this medicine.
32Reports
31%Marked serious
25%Recovered
6.3%Died or euthanised
1 daysTypical onset
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How soon it started
How the animals did
Problems reported at the same time
Age of the animals
About this medicine
Ivermectin prevents heartworm disease (monthly).
Products with this ingredient include Heartgard. The FDA hides brand names in its public data, so these reports cover every product with the same active ingredients.
Some herding breeds (for example Collies) carry the MDR1 gene variant and can be more sensitive to this drug class at high doses.
Questions owners ask
- Can Ivermectin cause behaviour change in cats?
- 32 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
- How soon after a dose was it reported?
- In half of the reports with dates, it started within 1 day of the first dose.
- What should I do?
- Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).
Behaviour change with similar medicines
- Behaviour change after Selamectin (Revolution) 822 reports · 3.7% of its reports
- Behaviour change after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) 176 reports · 5.4% of its reports
- Behaviour change after Eprinomectin + Praziquantel 32 reports · 5.5% of its reports
- Behaviour change after Milbemycin Oxime + Spinosad (Trifexis) 27 reports · 9.0% of its reports
All reported side effects of Ivermectin in cats · Medicines most reported with behaviour change