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Why is my dog panting and unstable after starting seizure meds?

Updated On September 23rd, 2025

Pet's info: Dog | Labrador Retriever | Female | unspayed | 6 years and 1 month old | 45 lbs

Hi My 6 year lab dusky had her first seizure 25 days ago and then 2 seizures yesterday in a gap of 4 hours. On my vets instruction we have started giving her phenobarbital 60mg twice. She has been panting heavily and has not appeared stable. Please help

1 Answer

Most Helpful Answer

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Answered By Ana M, DVM

Veterinarian

Published on June 26th, 2018

Thank you for submitting your question regarding Dusky. I am sorry to hear about her recent seizures. Most dogs will experience some side effects when first starting an anti-seizure drug. It can take a while for the dog's body to adjust to the medication. I suspect that is having the signs you have described from the phenobarbital. Her signs should resolve over several weeks. However, if she gets worse, has more seizures or does not seem to recover well from a seizure, then she will need to see her veterinarian. I hope this information helps!

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