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I have a dog who takes phenobarbital for epilepsy, and basically the worst that could happen is that the dog suffers some of the side effects common with phenobarb. Since the dog only had one, I wouldn't be too worried as the side effects are worse when the dog is taking multiple doses for a prolonged period of time. The side effects may include excessive thirst and hunger, sleepiness and lethargy, and of course ataxia which is the loss of control of the back legs and hips. The side effects only last a few weeks until the dog is used to the level of drugs in their system. So your dog may suffer some of the side effects but since it was just one pill, I can't see them lasting more than a day or two. Hope this helps!

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14y ago

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