How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dr. Bruce Your Own Question
Dr. Bruce
Dr. Bruce, Veterinarian
Category: Dog Veterinary
Satisfied Customers: 19296
Experience:  15 years of experience as a small animal veterinarian
Type Your Dog Veterinary Question Here...
Dr. Bruce is online now
A new question is answered every 9 seconds

What is the maximum dose of Phenobarbital pill you can give

Customer Question

What is the maximum dose of Phenobarbital pill you can give to a 13.5 year old golden retriever for treatment of seizure due to brain tumor? (Body weight 60 lbs)

I am asking this because I know this medicine is also used for euthanizing dogs and can be dangerous....
Submitted: 7 years ago.
Category: Dog Veterinary
Expert:  Dr. Bruce replied 7 years ago.



I can't straight out say what the maximum dose is that your dog can receive. This depends on their metabolism and tollerance for the drug. I will say that the veterinary drug formulary says this - Initially, 2-4 mg/kg PO divided into 2-3 doses per day. If ineffective, may increase in a stepwise fashion to a maximum of 18-20 mg/kg/day.

Customer: replied 7 years ago.

I am trying to find out what "lethal" dose is rather than general dosage.


I believe my dog died because of too much Phenobarbital, and I have not been able to sleep at all for a week. I really need to know this to have any kind of resolution.


Thank you.


Expert:  Dr. Bruce replied 7 years ago.
Can you tell me what dose of Phenobarbitol he was getting and for how long?