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Side Effects Of Phenobarbitol On Dogs

By Rena Sherwood | Updated September 26, 2017

Image by Flickr.com, courtesy of Faith Goble

"Phenobarbitol" is a common misspelling of the drug "phenobarbital." Phenobarbital is often prescribed for dogs with chronic seizure conditions, such as epilepsy, or for seizures brought on by poisoning or overdose of other medications. Side effects in dogs from phenobarbital are common.

Usual Side Effects

Common side effects of phenobarbital in dogs include drowsiness, agitation, increased appetite, increased thirst and increased urination.

Time Frame

According to veterinarian Dr. Mike Richards, the common side effects of phenobarbital in dogs should disappear in three to four weeks, once the dog's body has adjusted to the medication. If the dog has not adjusted, call your vet promptly.

Long Term

According to Mike Richards, DVM, and Dr. Dawn Ruben, long-term side effects of phenobarbital include kidney or liver damage.


In order to prevent long-term side effects from phenobarbital in dogs, Dr. Richards recommends regular blood tests to check liver and kidney functions.


According to The Pill Book Guide to Medication for Your Dog and Cat, symptoms of phenobarbital overdose in dogs include vomiting, strange and uncontrolled movements of the eyes, yellowing of the gums and coma.

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References (3)

Photo Credits

  • Image by Flickr.com, courtesy of Faith Goble


Rena Sherwood is a writer and Peter Gabriel fan who has lived in America and England. She has studied animals most of her life through direct observation and maintaining a personal library about pets. She has earned an associate degree in liberal arts from Delaware County Community College and a bachelor's degree in English from Millersville University.

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