Loss of appetite after Milbemycin Oxime (Interceptor) in cats

41 reports to the FDA describe loss of appetite in cats given Milbemycin Oxime. That is 10% of all reports for this medicine, compared with 14% across reports for all cat medicines.

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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

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 loss of appetite in cats?

41 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).

Loss of appetite with similar medicines

• Loss of appetite after Selamectin (Revolution) 2,481 reports · 11% of its reports
• Loss of appetite after Eprinomectin + Esafoxolaner + Praziquantel (NexGard Combo) 461 reports · 14% of its reports
• Loss of appetite after Ivermectin (Heartgard) 109 reports · 11% of its reports
• Loss of appetite after Eprinomectin + Praziquantel 62 reports · 11% of its reports
• Loss of appetite after Milbemycin Oxime + Spinosad (Trifexis) 27 reports · 9.0% of its reports

All reported side effects of Milbemycin Oxime in cats · Medicines most reported with loss of appetite