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My dog gained weight on phenobarbital for seizures. Is it the drug?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | 10 lbs

Would phenobarbital put weight on Penny? Been on it about 2 yrs for seizures. I feel it has. She has gained 5 lbs since. My vet says no. But we r careful with her diet,

1 Answer

Most Helpful Answer

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Answered By Megan, DVM, CVA

Veterinarian

Published on May 22nd, 2018

It is doubtful that it would be the primary cause of her weight gain. As they age, their metabolism will slow down and usually the amount of food that they need is less. I would try to decrease the amount of food you are feeding her and increase her activity. If she is still gaining weight, I would have your vet check her thyroid to ensure it isn't low as this is also a common cause of weight gain. I hope this helps !

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