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My epileptic dog threw up phenobarbital. Is a missed dose okay?

Updated On September 23rd, 2025

Pet's info: Dog | Maltese | Female | unspayed | 1 year and 8 months old | 4 lbs

Hello, my dog has epilepsy and is taking phenobarbital to treat it. She has been fine with the medicine before, but she left a little behind of her recent dose. Around ten minutes after, she threw up. Not sure how much medicine she let go. She also drank lots of water after and seems okay now. Should we be concerned with her and missing a dose?

1 Answer

Most Helpful Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on December 25th, 2018

Hello. Phenobarbital can be absorbed very quickly, so it possible that some has already entered the bloodstream. If Luna's seizures have been well controlled up to this point, then missing one dose will not be harmful. Just redose at her next normal scheduled time. If she continues to vomit or act unwell, see your vet quickly to have her liver & phenobarb levels checked to make sure all is well. Thanks for using Petco Pet Education Center, formerly Petcoach.

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