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My dog is lethargic after extra phenobarbital. Is it an overdose?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | neutered | 26 lbs

I accidentally gave my dog 3/4 1 grain of phenobarbital instead of 3/4 of a 1/2 grain last night. He received his 3/4 of the 1/2 grain this morning but is very lethargic - he is also in pain because of a right foot injury. Should I be concerned about an overdose?

1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on April 19th, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! No, I wouldn’t be concerned about the extra phenobarbital. It could cause minor sedation. If he is very lethargic it is unrelated to the medication. I would encourage a vet exam for the foot injury if he is worsening. Have a great day!

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