S-methoprene side effects in dogs
1,638 reports sent to the FDA between 2000 and 2025 involve S-methoprene in dogs. The most reported problems were lethargy, vomiting, wobbliness (ataxia). 0.4% were marked serious.
1,638Reports
0.4%Marked serious
98%Only medicine involved
1.1%Recovered
2.4%Died or euthanised
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About this medicine
Type: medicine.
Most reported side effects
Share = percentage of this medicine's reports that mention the problem. One report can list several problems.
Reports that it didn't work
Some reports are about the medicine not working (for example a dog still getting fleas or heartworm), not about a side effect.
How soon problems started
Time from the first dose to the first sign, where both dates were reported (27 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Chihuahua 124 reports
- Yorkshire Terrier 93 reports
- Poodle 76 reports
- Labrador Retriever 76 reports
- German Pomeranian Spitz 76 reports
- Shih Tzu 53 reports
- Dachshund 48 reports
- Jack Russell Terrier 46 reports
- Cocker American Spaniel 32 reports
- Golden Retriever 30 reports
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