Weight gain after Ivermectin + Pyrantel (Heartgard Plus) in dogs
The FDA has received 596 reports of weight gain in dogs after Ivermectin + Pyrantel. That is 0.4% of all reports for this medicine, compared with 0.6% across reports for all dog medicines, so it is reported less often than average with this medicine.
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). Pyrantel treats roundworms and hookworms.
Products with this combination include Heartgard Plus, Tri-Heart Plus, Iverhart Plus. 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 + Pyrantel cause weight gain in dogs?
- 596 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 153 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).
Weight gain with similar medicines
- Weight gain after Milbemycin Oxime + Spinosad (Trifexis) 2,619 reports · 2.0% of its reports
- Weight gain after Moxidectin (ProHeart 6) 93 reports · 0.2% of its reports
- Weight gain after Milbemycin Oxime + Praziquantel (Interceptor Plus) 575 reports · 1.8% of its reports
- Weight gain after Milbemycin Oxime (Interceptor) 145 reports · 0.5% of its reports
- Weight gain after Selamectin (Revolution) 47 reports · 0.2% of its reports
- Weight gain after Ivermectin (Heartgard) 140 reports · 1.2% of its reports
- Weight gain after Ivermectin + Praziquantel + Pyrantel (Iverhart Max) 23 reports · 0.3% of its reports
- Weight gain after Moxidectin + Pyrantel + Sarolaner (Simparica Trio) 23 reports · 2.0% of its reports
All reported side effects of Ivermectin + Pyrantel in dogs · Medicines most reported with weight gain