Tremors after Milbemycin Oxime (Interceptor) in cats
20 reports to the FDA describe tremors in cats given Milbemycin Oxime. That is 4.9% of all reports for this medicine, compared with 2.6% across reports for all cat medicines, so it is reported unusually often with this medicine.
20Reports
20%Marked serious
5.0%Recovered
0.0%Died or euthanised
–Typical onset
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How the animals did
Problems reported at the same time
Age of the animals
About this medicine
Milbemycin Oxime prevents heartworm and controls some intestinal worms (monthly).
Products with this ingredient include Interceptor. 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 Milbemycin Oxime cause tremors 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.
- 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).
Tremors with similar medicines
- Tremors after Selamectin (Revolution) 677 reports · 3.1% of its reports
- Tremors after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) 218 reports · 6.7% of its reports
- Tremors after Ivermectin (Heartgard) 84 reports · 8.7% of its reports
- Tremors after Eprinomectin + Praziquantel 28 reports · 4.8% of its reports
All reported side effects of Milbemycin Oxime in cats · Medicines most reported with tremors