Hair loss after Ivermectin (Heartgard) in cats
20 reports to the FDA describe hair loss in cats given Ivermectin. That is 2.1% of all reports for this medicine, compared with 14% across reports for all cat medicines, so it is reported less often than average with this medicine.
20Reports
40%Marked serious
10%Recovered
0.0%Died or euthanised
3 daysTypical onset
Sponsored
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 hair loss in cats?
- 20 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 3 days 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).
Hair loss with similar medicines
- Hair loss after Selamectin (Revolution) 8,059 reports · 37% of its reports
- Hair loss after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) 395 reports · 12% of its reports
- Hair loss after Eprinomectin + Praziquantel 54 reports · 9.2% of its reports
All reported side effects of Ivermectin in cats · Medicines most reported with hair loss