Does CBD Oil Interact With Phenobarbital In Dogs


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Can I Give My Dog CBD Oil And Phenobarbital? Phenobarbital is a common prescription seizure drug your vet may give your dog. With CBD pet treats and products quickly rising in popularity, many Phenobarbital is one of the most common prescribed medications for dog seizures. What if I told you there is a natural alternative, CBD.

Can I Give My Dog CBD Oil And Phenobarbital?

Phenobarbital is a common prescription seizure drug your vet may give your dog. With CBD pet treats and products quickly rising in popularity, many dog owners are aggressively on the hunt to find a more natural solution (with fewer side effects) to stop their puppy from having seizures.

Medical journals show CBD is an effective & potent alternative to phenobarbital. Further results show a significant increase in effect & potency in combining both CBD with trace amounts of THC didn’t show to be helpful. The most recommended CBD is broad-spectrum tincture oil.

Two broad spectrums CBD oil tinctures we recommend inlcude.

Below, we’ll look at how several dogs owners managed to ween their puppies off the phenobarbital. Additional information we link to and discuss are clinical trials, veterinarians specializing in CBD and neurology, CBD dosage, and more helpful information to have the best experience for your dog with CBD.

CBD Vs Phenobarbitol – Why Dog Owners Are Considering CBD over prescription meds?

After scrolling through my Facebook feed, a question caught my eye and piqued my curiosity about giving CBD to your dog – for a specific reason.

The gentleman asking CBD questions first realized there are SO many types of CBD products to choose from and then he listed a few CBD brands he was aware of and was hearing people talk about.

He then described the size of his dog and revealed his fur baby was on Phenobarbital.

He and his vet were in the process of weening the pup off of the Phenobarbital and was heavily considering starting his pup on CBD.

At his wits ends, he then admitted he was at the point and willing to try anything.

CBD got his attention because of all the wonderful stories he was hearing and the positive effective reports of using CBD for their puppy.

Not only was this gentleman concerned about his puppy’s abnormal episodes triggering randomly, but he was also noticing a lot of fear and worry after an extreme violent shaking episode.

After reading through all the “sales” based Facebook comments, most of the people attempting to help this gentleman with his puppy were quick to push him to buy their affiliate CBD brand, so they could get a quick commission.

I too admit to being a wee-bit guilty of sharing information about a CBD brand I personally recommend, however, I was noticing everyone’s comments were not too helpful.

The concerned gentleman mentioned that he was wanting to start giving his puppy CBD oil “without” discussing this decision with his veterinarian.

This part of the story GRABBED my attention and my immediate concern was wondering if there are any potential negative effects that could occur from mixing CBD and phenobarbital together?

Were there any potential drug interactions between the two that would cause a potentially life-threatening event? I had no idea, and it was very strange that no one else seemed to be interested in the potential dangers of mixing medications. So I started doing some research.

What are medical journals saying about mixing CBD with phenobarbital?

My initial Google search popped up quite a few CBD brands explaining everything except the answers I was looking for.

Some of these lower quality CBD brand blogs were going around the horn asking the basic questions and avoiding the critical question of potential drug interactions of CBD and phenobarbital.

Some of the questions these other bloggers were asking were questions you could easily look up, including, what is phenobarbital, what is CBD, how does phenobarbital work in dogs, what are the side effects of phenobarbital, and they even where blogging about the price of phenobarbital going up.

This had nothing to do with legitimate research in mixing CBD with phenobarbital.

Also, I was noticing, none of these blog posts were persistently avoiding answering the basic question.

Is it safe and effective to give you puppy both CBD and phenobarbital at the same time?

Or should you completely ween them off of the phenobarbital before you give them CBD?

One blog post I found casually said there are no reports of negative effects of using both CBD and phenobarbital or any other vet prescribed medication.

My problem with this statement on this particular low-quality CBD brand blog was there were no links to any medical journal supporting their casual claims, it was just another CBD blog saying things without linking to authoritative research.

After vigorous research, I finally came across a few medical journals providing the information and research I was looking for.

The first medical journal I came across mentioning CBD and phenobarbital was The Journal Of Pharmacology And Experimental Therapeutics (J Pharmacol Exp Ther.).

In this medical journal, they compare both the effects of both CBD by itself, THC by itself, and the mixing CBD with other drugs (phenytoin, phenobarbital, carbamazepine, chlordiazepoxide, clonazepam, ethosuximide, and trimethadione).

The results found CBD to be effective and potent.

Additional results showed the potency of mixing CBD and phenobarbital to significantly increase.

However, CAUTION – when mixing CBD with any of the other of these listed drugs did in fact reduced the effects and potency.

Should I try full-spectrum CBD, broad-spectrum, or CBD isolate?

Further concerning questions asked included, are there any risks with using a full-spectrum CBD oil that includes THC? What is the worst that could happen to my dog tried a CBD oil that also included THC?

In the medical journal referenced above, there is no indication that THC was helpful.

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One blogger went into extensive detail in how she was able to ween her puppy off of phenobarbital.

She also gave some insight as to why you should not give you puppy THC is because dogs are very sensitive to THC.

Therefore a quality broad-spectrum CBD might be ideal because there is zero THC in it, but, it will include a large variety of other helpful cannabinoids that will make the CBD oil work more effective.

Whereas, CBD isolate brands are mostly ineffective, due to the bell-shaped dosage response curve you must overcome through providing an exact precise dosage, to even get a minimal effect.

Anyways, in her blog, she references Dr. Stephanie McGrath who is a veterinarian specializing in neurology and advocates for CBD use in veterinary practices.

Published in the Journal Of The American Veterinary Medical Association, Dr. McGrath led a clinical trial study in assessing the effects of oral CBD giving in addition to conventional treatment.

Results from this clinical trial showed 89% of dogs receiving CBD experienced a significant return to normal function.

How much CBD do I give my dog?

When starting your puppy on CBD, it’s recommended you start with the lowest dose possible and then keep increasing the dosage every week or two until you’ve achieved the results you’re aiming for.

It’s best to discuss the best CBD dosage for your puppy with your veterinarian.

Although my preliminary research indicates there are no drug interactions, it’s best to verify the research with a licensed professional.

Reports from Dr. McGrath’s clinical trials listed the exact procedure and dosage of CBD-infused oil giving to dogs.

In the group of dogs receiving CBD, the dosage was 2.5 mg/kg [1.1 mg/lb] two times a day for 12 weeks.

  • A specific example of how much CBD to give a 12-pound dog is 13.2 mg.
  • For a 55-pound dog, you’ll need to give them about 60.5 mg of CBD.

If you’re having trouble figuring out how many milligrams (mg) of CBD is in each drop, enter in the numbers into the CBD Dosage Calculator and it will tell you exactly how much CBD is in each drop of your CBD oil.

Does CBD help your dog with worry, nervousness, or unease?

Yes. CBD is shown to help bring the mind back to normal function.

If you notice your puppy feeling uneasy, nervous, tense, jittery, etc., CBD can have the powerful potential to help them return to feeling optimal levels of normal.

How do you calm a dog down after an episode?

The best way to calm your dog down is to remain calm. When you remain calm, your dog tends to reflect your behavior patterns and follow your lead. If they look fearful, you might want to sit down and spend a few moments comforting them until they feel better.

Most of the time, a little treat after an attack can help take focus their mind in a better direction.

What’s the best CBD oil for your dog?

The best CBD oil to give your dog are the brands that put extra care and caution into producing the absolute best quality possible. Yes, there are a good handful of good CBD brands out there. However, one main concern I’ve noticed about different CBD brands is the consistent quality factor.

Some CBD brands have had problems, not necessarily creating an initial high-quality CBD oil, but, the real challenge appears to be in the long-term maintenance of that high-quality standard.

In some states, like Idaho, where consistency is a critical factor, it’s highly recommended that you choose a CBD brand that can consistently create a high-quality broad-spectrum CBD oil, that won’t run the risk of popping positive for THC.

Currently, Idaho law is very strict and essentially says if the CBD oil has any little bit of any trace amounts of THC, then they consider it illegal marijuana.

Another primary reason I like Joy Organics is because of the thorough “complete” lab testing on all batches.

These strict lab testing protocols not only reveal the safety, but also lets you know whether or not it’s a CBD isolate product or a true broad-spectrum CBD oil.

Dog Seizures: CBD vs. Phenobarbital

When it comes to controlling seizures in animals, there are many different options for pet parents to consider. One of the most commonly prescribed antiepileptic drugs used by veterinarians today is Phenobarbital.

Despite its widespread use, the side effects of phenobarbital are potentially devastating for pets. While it is relatively effective at keeping seizures at bay, PB is known to dramatically affect our pet’s quality of life by simultaneously putting significant strain on their liver.

As an alternative, CBD from a full spectrum hemp extract has powerful anti-epileptic properties. Research shows it is an effective way to control seizures in dogs while avoiding the numerous negative side effects associated with pharmaceutical drugs like Phenobarbital.

Table of Contents

What is Phenobarbital for Dogs?

Phenobarbital is part of the family of drugs called barbiturates, and can be found under various brand names such as Lumina, Solfoton and Tendral.

It was first synthesized for human use waaaaay back in 1911.

It is one of the oldest synthetic drugs still in wide use today. Initially, it was formulated as a hypnotic and sedative, but in February 1912, a young clinical assistant discovered it’s antiepileptic properties and the rest is history…

Since then, it has been widely used for humans and pets alike as an anti-epileptic, but not without its own set of side effects and risks.

How is it administered?

In most cases, phenobarbital for dogs is administered orally, once or twice a day. It comes in both tablet and liquid form, as well as intravenously at veterinary offices.

Various dosages are given based on a dog’s weight and the severity of seizures, among other factors, as sensitivity to this drug ranges quite a bit.

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How does it work?

Phenobarbital works by suppressing electrical impulses within your pet’s brain and depressing the central nervous system. Think of it like turning down the volume on your car radio. Less energy through the system means less peaks on the high end.

‘Barbiturates’ like PB are metabolized primarily by the liver and secreted by the kidneys making them potentially problematic when combined with other drugs.

According to Dr. Zac Philossoph, phenobarbital takes a couple of weeks to reach stable blood concentration levels and may not be effective immediately. Consistency is especially important with this drug, as missed doses can result in a recurrence of seizures.

Depending on the case, there are varying degrees of effectiveness with this drug. It does not necessarily stop seizures altogether, in fact, Dr. Carla Johnson reports that in most cases it only reduces seizures frequency by 50%.

Seizures and Epilepsy

Seizures are caused by an excess of electrical energy in your dog or cat’s brain. CBD Dog Health’s chief veterinary officer, Dr. Zac Philossoph uses the analogy of seizures as a ‘brain sneeze’. That sounds cute, but seizures can be very scary.

When neurons begin misfiring and overactivating, it can cause all the hallmarks of a seizure.

  • Spasmodic jerks throughout the body
  • Loss of motor function
  • Loss of consciousness

Dog seizures happen for a range of reasons. Some occur because of structural damage to the brain, some because of interactions with elements in our dogs’ environment. In addition, some breeds are just more prone to seizures than others.

Classification of seizures is done a couple of ways. First, seizures are classified with regard to the underlying cause of the seizure.

What Causes Dog Seizures?

The first thing veterinarians will define is the catalyst for epileptic events. This is meant to define the origin of the episodes whether it be internal or external forces.

  • Structural seizures are due to primary brain disease (e.g. degenerative disease, brain tumor, stroke).
  • Idiopathic epilepsy is subdivided into proven-genetic (breed-related), suspected-genetic, and epilepsy of unknown origin.
  • Reactive seizures are due to metabolic, systemic or other non-primary brain disease.

In many cases seizures are caused a combination of underlying conditions and external factors:

  • Kidney disease
  • Liver disease
  • Vascular disease
  • Embolism
  • Traumatic injury to the head
  • Electrolyte imbalance
  • High or low blood sugar
  • Anemia
  • Encephalitis
  • Poisoning

Breeds Prone to Epilepsy

Breeds such as Australian Shepherds, Beagles, Belgian Tervurens, Border Collies, Collies, German Shepherds, Labrador Retrievers, Cavalier King Charles Spaniels , Dachshunds , English Springer Spaniels , Finnish Spitz , Irish Wolfhounds , Lagotto Romagnolos , Petit Basset Griffon Vendeens , Shetland Sheepdogs , Standard Poodles and Vizslas are more genetically predisposed to experiencing seizures than other breeds.

Types of Seizures

According to the International Veterinary Epilepsy Task Force , there are three main types of seizures in animals:

  • Generalized Seizures
  • Myoclonic Seizures
  • Focal Seizures

Generalized Seizures

This class of seizure is often known as a Gand Mal seizure. They involve both cerebral hemispheres, and usually result in a loss of consciousness.

Myoclonic Seizures

Similar to generalized seizures, but does not usually result in unconsciousness. These seizures are typically caused by stimuli like light or sound. They can also be a result of underlying structural damage in the brain.

Focal Seizures

Focal seizures usually do not result in unconsciousness. They typically only affect one hemisphere in the brain and present as subtle changes in behavior, like twitching, absent-minded chewing or loss of balance. Focal seizures often precede more serious degenerative patterns that cause more generalized seizure activity.

According to Dr. Michelle Carnes, “Our [epileptic] patients may experience focal seizures prior to developing generalized seizures; they just probably go unnoticed,”

An Alternative to Phenobarbital…

CBD from a full-spectrum hemp extract!

Since hemp became federally legal in 2018, a lot of research has been done to explore the efficacy of CBD as a treatment for epilepsy. Aside from thousands of anecdotal cases where seizures were treated with cannabis, we now have clinical research that confirms those findings.

In a 2017 double-blind study conducted by Colorado State University , 89% of dogs who received CBD in the clinical trial had a reduction in the frequency of seizures. Additionally, they saw a significant association between the degree of seizure reduction and the amount of CBD concentration in the dog’s blood.

This was not the only study to find CBD to be a successful anti-epileptic supplement for pets. Yamazaki University of Animal Health Technology in Japan conducted a similar experiment with great results.

In addition to these clinical trials, holistic pet cannabis expert, Angela Ardolino has treated hundreds of animals on her rescue, Fire Flake Farm.

In a recent interview, she talked about one of her rescue’s journey.

“We had an 18-year-old Chihuahua who had been experiencing multiple grand mal seizures a day, but 100 mg of the HEAL full spectrum hemp extract tincture from CBD DOG Health every day kept them at bay. Along with reducing her dementia, increasing her energy, focus and appetite”.

Daisie was fed a well rounded raw and fresh diet as well as getting daily applications of Soothe salve on her yeasty paws. With great pride Angela says, “After a month, you would hardly recognize this dog!”

Side Effects of Phenobarbital

When our pets have seizures the first thing we are concerned about is their safety and comfort. The last thing we want to do is cause them more discomfort or put them in danger, but with drugs like PB that is often the unintended consequence of long-term use.


As we’ve discussed, the main way that phenobarbital works is by suppressing electrical energy in the brain. One of the clear results of this mechanism is it reduces the mental function of our pets. They are commonly reported to be tired, slow and almost depressed looking. Where quality of life is concerned, this is a big loss.

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Excessive Hunger

Pet parents commonly see their dogs gaining a lot of weight while taking phenobarbital. Not only does this affect their quality of life, but it can also cause a domino effect in other areas of their health and well-being.

Excessive Urination

Polyuria, or excessive urination is caused by the increased thirst drive in dogs who take PB. When your dog or cat is taking this drug, it is not uncommon to find messes around the house.


Especially in the beginning, many dogs who are treated with Phenobarbital experience vomiting and an upset stomach. Typically this diminishes after a couple weeks of treatment.

Neurotoxicity in Younger Animals

Phenobarbital is not recommended for younger animals as clinical research indicates it has neurotoxic effects and can be extremely detrimental to cognitive development. Suppression of brain function sounds bad for any animal, but it is especially detrimental to developing brains.

Liver Damage

One of the most significant side effects that dogs experience when treated with Phenobarbital is stress, and eventual damage to the liver. In most cases, long term damage occurs after the three months mark. It can start with scarring of the liver and end with significant loss of liver function, depending on how closely they are monitored by your veterinarian.

In the majority of dogs, a serum PB concentration between 25−30 mg/l is required for optimal seizure control. Serum concentrations of more than 35 mg/l are associated with an increased risk of hepatotoxicity and should be avoided.

Phenobarbital has been linked to raised levels of several liver enzymes that are used as markers to indicate liver damage (ALP, ALT, GGT). The significant anomalies in these levels indicate that the liver is working overtime to process the drug.

Side Effects of CBD for Dog Seizures

CBD is known for its high level of efficacy with seizure control as much as it is for the safety of its use. There is a significant amount of research that points to the safety of CBD as a way to help our pets, even at extremely high doses well above the normal recommended levels.

Many critics of CBD will point to one study which suggests that the use of CBD can lead to a rise in one particular liver enzyme, APL. According to experts in the veterinary field like Dr. Gary Richter DVM, this is not a significant rise and should be looked at as insignificant.

It is worth mentioning that there are multiple other studies which do not show any increase in liver enzymes like ALP for dogs treated with CBD from a full-spectrum hemp extract.

What we do know is that the minimal rise in liver enzymes from CBD is nothing compared to the significant levels seen in dogs treated with phenobarbital. CBD is not known to cause liver damage, but it is processed by the liver.

Phenobarbital Interactions With Other Drugs

Along with the numerous side effects and potential damage to the liver, Phenobarbital can have dangerous interactions with a long list of drugs. If you are using Phenobarbital for your dog, consider the limitations associated with its relationship to other treatments.

Avoid phenobarbital in combination with these drugs.

*Note* This is not an exhaustive list.

  • Corticosteroids
  • Cyclosporine
  • Metronidazole
  • Voriconazole
  • Digoxin
  • Digitoxin
  • Phenylbutazone
  • Some Anaesthetics
  • Cimetidine
  • Omeprazole
  • Lansoprazole
  • Chloramphenicol
  • Trimethoprim
  • Fluoroquinolones
  • Tetracyclines
  • Ketoconazole
  • Fluconazole
  • Itraconazole
  • Fluoxetine
  • Felbamate
  • Topiramate

CBD Interaction with Other Drugs

Though CBD’s interaction with other drugs still requires more clinical review, it is widely believed to be incredibly safe and stable with most commonly prescribed pharmaceuticals.

That being said, CBD is just one part of many in a complex relationship between compounds interacting in a full-spectrum hemp extract. Depending on the drug, it is possible that CBD may increase or decrease potency of another drug, or have no effect at all. It is always a good idea to consult with your holistic vet to find out how CBD may interact with drugs your pet is already taking.

For more information about drug interactions with CBD, check out this article !


When given the choice between Phenobarbital and CBD for the treatment of seizures, the most important thing to consider is quality of life. Our goal in the first place when trying to reduce seizure intensity and frequency is to make our dogs feel better.

The issue with so many of these conventional pharmaceutical drugs is you replace one problem with a whole set of others that can end up being even more detrimental than the ones you started with.

Though the effects may not be immediately as effective with a holistic approach, you can be confident that the effects will be better tolerated and more supportive of your pet’s wellness and longevity.

Carter Easler

Father of a bulldog, Moo, Carter is a life-long animal lover from Toronto, Canada currently residing in Brooklyn, NY. Growing up in a family of veterinarians, he grew up surrounded by animals. He had dogs, cats, rodents, reptiles — you name it, and Carter probably rescued it. Carter’s passion for cannabis activism started when he was in high school. After learning about the senseless prohibition and incredible diversity of cannabis’s utility, he was inspired to get involved. When Carter met Angela, he was excited to learn that he could combine his passions: animals and cannabis. Carter now travels North America to educate pet parents, retailers, and veterinarians about CBD. He is excited to bring his passion for pets to CBD Dog Health.

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