Dog seizures Won't Stop Guide

Dog Still Having Seizures on Phenobarbital

Posted by Lianne McLeod D.V.M. on

Dog seizures Won't Stop Guide

When your dog has epilepsy, it's a journey filled with ups and downs. Starting phenobarbital, a common anti-seizure medication, might give you hope. But if the seizures keep happening, it can be disheartening.

It's time to sit, stay, and learn about the next steps in your pup's epilepsy treatment. We'll fetch new ideas and tricks to help your furry friend, proving that when it comes to beating seizures, you can indeed teach an old dog new tricks.

What Are Seizures?

A seizure occurs when there's unusual electrical activity in your dog's brain. During a seizure, your dog might shake, lose control of their body, or act strangely. It can be frightening to watch, but most seizures don't hurt your dog.

Dogs can have different kinds of seizure disorders. Generalized seizures affect the whole body. Your dog might fall over and shake all over. Cluster seizures are when several seizures occur close together. This can be more serious.

Seizures that happen because of something outside the dog's brain, like eating something bad are called reactive seizures. Seizures that come from problems inside the brain are called structural seizures. Many dogs have idiopathic epilepsy, which means doctors can't find a clear cause.

Treating Epilepsy in Dogs with Phenobarbital

When your dog has epilepsy, your vet will likely suggest an anti-seizure medication to help control the seizures. One common drug is called phenobarbital. It helps many dogs have fewer seizures or stop having them altogether.

 

Using phenobarbital to treat epilepsy in dogs - a senior dog sitting outside

How Phenobarbital Works

Phenobarbital has been used for years and helps many epileptic dogs. This medicine works by calming the brain. It slows down the electrical signals that cause seizures. When these signals slow down, seizures are less likely to happen.

It's good at stopping both generalized seizures and cluster seizures. For many dogs, it can cut down on how often seizures occur.

Giving Your Dog Phenobarbital

Getting the right dose is key. Your vet will determine how much phenobarbital your dog needs based on their weight. Most dogs take it twice a day. It's important to give it at the same time each day. This keeps the drug level steady in your dog's body.

When you start phenobarbital, your vet might use a loading dose. This is a higher dose at first to get the drug working faster. After that, you'll switch to the regular dose.

You'll need to be patient. It can take a few weeks for phenobarbital to reach its full effect. During this time, your dog might still have some seizures. Don't worry, this doesn't mean the drug isn't working.

Getting the Dose Right

Your vet will do blood tests to check the phenobarbital levels in your dog's body. This helps make sure the dose is right. The goal is to keep the drug in what's called the therapeutic range. This means there's enough in the body to stop seizures, but not so much that it causes problems.

These blood tests are crucial. They help your vet adjust the dose if needed. If the level is too low, your dog might still have seizures. If it's too high, there could be side effects.

You'll need to bring your dog in for blood tests regularly. At first, this might be every few weeks. Once the dose is stable, you might only need tests every six months or so.

Side Effects to Watch For

Like all drugs, phenobarbital can cause side effects. Many dogs get used to the drug over time and side effects lessen. But it's good to know what to look out for.

1. Increased Thirst and Hunger

Your dog might drink and eat more than usual. This is normal but can lead to weight gain if you're not careful.

2. Sleepiness

Some dogs get drowsy, especially when first starting the drug. This often gets better with time.

3. Unsteadiness

Your dog might seem frail, especially at first. This usually improves as they get used to the medicine.

4. Liver Concerns

One big concern with phenobarbital is its effect on the liver. Over time, it can cause liver disease such as liver toxicity in some dogs. This is why regular blood tests are important. They check the drug level and also how well the liver is working.

If liver problems show up, your vet might need to change the treatment plan. They might lower the phenobarbital dose or switch to a different drug. In some cases, they might add another medication to help protect the liver.

When Your Dog's Seizures Don't Stop

Is your dog still having seizures on phenobarbital? Don't lose hope. When seizures continue despite treatment, it’s called refractory epilepsy. It means the epilepsy is hard to control. Let's look at why this happens and what you can do.

Breakthrough Seizures

A breakthrough seizure, also known as recurrent seizure, is when your dog has a seizure even though they're taking medicine. It's like the seizure "breaks through" the protection of the drug. These can happen now and then, even when treatment is working well. But if they happen often, it's a sign that the current treatment isn't enough.

How often is too often? That depends on your dog. For some, even one seizure a month is too many. For others, a few seizures a year might be okay.

Signs Your Dog's Epilepsy Isn't Well-Controlled

Watch for these signs that your dog's seizures aren't under control:

1. More Frequent Seizures

If your dog starts having recurrent seizures more often, that's a red flag. Keep a log of when a seizure occurs. This helps your vet see patterns.

2. Longer or More Severe Seizures

Seizures that last longer or seem worse than before are concerning. If a seizure lasts more than five minutes, it's an emergency.

3. Cluster Seizures

These are when your dog has several seizures close together. They can be dangerous and need quick action.

4. Postictal Period Changes

The time right after a seizure is called the postictal period. If this gets longer or your dog seems more confused, tell your vet.

When you're dog's seizure events don't reduce, what should you do? A senior dog looking into the distance in this image

Adjusting the Treatment Plan

If your dog is still having seizures on phenobarbital, your vet might try a few things:

1. Changing the Dose

They might increase the amount of phenobarbital. This needs careful monitoring to avoid side effects.

2. Adding Another Drug

Sometimes, using two seizure medications works better than one. Potassium bromide is often added to phenobarbital.

3. Trying New Medications

There are newer anti-epileptic drugs that might help. These can be used alone or with phenobarbital.

Exploring Other Options

Some vets might suggest options like special diets or alternative therapies.

Beyond Phenobarbital: Other Options for Seizure Control

There are many other seizure medications and treatment options available. Your vet might suggest trying different anti-epileptic drugs, combination therapies, or even some alternative treatments.

1. Potassium Bromide

Potassium bromide is often the next step when phenobarbital alone doesn't cut it. It's been used for a long time and works well for many dogs.

How It Works

Potassium bromide works by stabilizing neuronal membranes and enhancing the inhibitory effects of GABA, a neurotransmitter that calms the brain. It can take a while to start working, sometimes up to three or four months. But for many dogs, it's worth the wait.

2. Extended-Release Formulas

Some newer seizure medications come in extended-release formulas. These are designed to release the drug slowly over time. This can help keep a steady level of medicine in your dog's body.

Benefits

Extended-release drugs might mean you can give medicine less often. They can also help reduce side effects. For some dogs, this leads to better seizure control with fewer problems.

3. Combination Therapy

Often, using more than one seizure medication works better than using just one. This is called combination therapy.

Why It Works

Different drugs work in different ways. By combining them, you can sometimes stop seizures that one drug alone can't handle. It can also let you use lower doses of each drug, which might mean fewer side effects.

Common Combinations

Phenobarbital and potassium bromide are a common duo. But there are many other possible combinations. Your vet will choose based on your dog's specific needs.

4. Exploring Alternative Treatments

When standard antiepileptic drug therapy isn't enough or you want to try something different. Some alternative treatments show promise for seizure control in dogs.

Medium-Chain Triglycerides (MCTs)

These are special fats that might help control seizures. Some studies show they can reduce seizures in dogs when added to their diet. MCTs are found in coconut oil and some special dog foods.

How They Work

MCTs provide a different kind of energy for the brain. This might help stop seizures from happening.

CBD Oil

There's growing interest in using CBD oil for dogs with epilepsy. It comes from hemp plants but doesn't make dogs "high." Studies show it might help reduce seizures.

Always talk to your vet before trying CBD oil. It can interact with other medications. Also, not all CBD products are of the same quality. Your vet can help you find a safe option.

Acupuncture

This ancient practice involves putting tiny needles in specific points on the body. Some dogs seem to have fewer seizures with regular acupuncture treatments. It's usually used along with regular medications, not instead of them.

 

What should you do if your dog has two or more seizures? A small senior dog standing on a rock in this image.

Making the Right Choice

With so many options, how do you know what's best for your dog? Here are some things to consider:

Your Dog's Health

Some treatments might not be right if your dog has other health issues. For example, liver problems might rule out certain drugs.

Seizure Type and Frequency

Different treatments work better for different kinds of seizures. Seizure frequency in dogs also matters.

Side Effects

All treatments can have side effects. Think about which ones you and your dog can handle.

Cost

Some newer treatments can be expensive. Talk to your vet about options that fit your budget.

Your Lifestyle

Consider how often you can give medication and visit the vet for check-ups.

Living Well with an Epileptic Dog

Having a dog with epilepsy doesn't mean you can't have a happy, full life together. With some smart choices and a bit of planning, you can help your furry friend thrive.

Making Your Home Seizure-Safe

First, take a look around your house. Pad sharp corners on furniture. Keep floors clear of small objects. If your dog likes to climb, consider blocking off stairs when you're not around. These small changes can make a big difference in keeping your dog safe.

Food and Fun

What your dog eats and how much they move can affect their seizures. Some dogs do better on special diets. Your vet might suggest foods with medium-chain triglycerides that might help control seizures.

Exercise is good for all dogs, even those with epilepsy. Regular walks or playtime can help reduce stress. Just be careful not to overdo it. Too much excitement can sometimes trigger seizures in some dogs.

Keeping Calm

Stress can make seizures more likely. Help your dog stay calm by keeping a steady routine. Regular mealtimes, walks, and quiet time can all help. Some dogs like gentle music or a cozy den-like space to relax in.

Try to avoid sudden changes or loud noises when you can. If you know something stressful is coming up, like a trip to the vet, plan ahead. Talk to your vet about ways to keep your dog calm during these times.

On-Time, Every Time with the Medication

One of the most important things you can do is give your dog medicine on time, every time. Set alarms on your phone if it helps. Make a chart to track doses. If you're going to be away, make sure someone reliable can give the anti-seizure medicine.

Keeping a steady level of medication in your dog's body helps prevent seizures. It also helps avoid the side effects that can come from missed doses.

Your love and care are powerful medicine too. Stay positive, keep learning, and enjoy your time with your special pup. With patience and persistence, you'll help your four-legged friend live their best life, seizures or no seizures.

References

  1. Podell, M., Fenner, W., & Powers, J. (1995). Seizure classification in dogs from a nonreferral-based population.. Journal of the American Veterinary Medical Association, 206 11, 1721-8 . https://doi.org/10.2460/javma.1995.206.11.1721.

  2. Zimmermann, R., Hülsmeyer, V., Sauter-Louis, C., & Fischer, A. (2009). Status epilepticus and epileptic seizures in dogs.. Journal of veterinary internal medicine, 23 5, 970-6 . https://doi.org/10.1111/j.1939-1676.2009.0368.x.

  3. Boothe, D., Dewey, C., & Carpenter, D. (2012). Comparison of phenobarbital with bromide as a first-choice antiepileptic drug for treatment of epilepsy in dogs.. Journal of the American Veterinary Medical Association, 240 9, 1073-83 . https://doi.org/10.2460/javma.240.9.1073.

  4. Müller, P., Taboada, J., Hosgood, G., Partington, B., Vansteenhouse, J., Taylor, H., & Wolfsheimer, K. (2000). Effects of Long‐Term Phenobarbital Treatment on the Liver in Dogs. Journal of Veterinary Internal Medicine, 14, 165 - 171. https://doi.org/10.1111/j.1939-1676.2000.tb02231.x.

  5. Muñana, K. (2013). Management of refractory epilepsy.. Topics in companion animal medicine, 28 2, 67-71 . https://doi.org/10.1053/j.tcam.2013.06.007.

  6. Heynold, Y., Faissler, D., Steffen, F., & Jaggy, A. (1997). Clinical, epidemiological and treatment results of idiopathic epilepsy in 54 labrador retrievers: a long-term study.. The Journal of small animal practice, 38 1, 7-14 . https://doi.org/10.1111/J.1748-5827.1997.TB02977.X.

  7. Monteiro, R., Adams, V., Keys, D., & Platt, S. (2012). Canine idiopathic epilepsy: prevalence, risk factors and outcome associated with cluster seizures and status epilepticus.. The Journal of small animal practice, 53 9, 526-30 . https://doi.org/10.1111/j.1748-5827.2012.01251.x.

  8. Maeso, C., Sanchez-Masian, D., Ródenas, S., Font, C., Morales, C., Domínguez, E., Puig, J., Arévalo-Serrano, J., & Montoliu, P. (2022). Prevalence, distribution, and clinical associations of suspected postictal changes on brain magnetic resonance imaging in epileptic dogs.. Journal of the American Veterinary Medical Association, 1-11 . https://doi.org/10.2460/javma.21.02.0088.

  9. Stabile, F., Barnett, C., & Risio, L. (2017). Phenobarbital administration every eight hours: improvement of seizure management in idiopathic epileptic dogs with decreased phenobarbital elimination half-life. Veterinary Record, 180, 178 - 178. https://doi.org/10.1136/vr.104051.

  10. Royaux, E., Ham, L., Broeckx, B., Soens, I., Gielen, I., Deforce, D., & Bhatti, S. (2017). Phenobarbital or potassium bromide as an add-on antiepileptic drug for the management of canine idiopathic epilepsy refractory to imepitoin.. Veterinary journal, 220, 51-54 . https://doi.org/10.1016/j.tvjl.2017.01.002.

  11. Stabile, F., Dijk, J., Barnett, C., & Risio, L. (2019). Epileptic seizure frequency and semiology in dogs with idiopathic epilepsy after initiation of imepitoin or phenobarbital monotherapy.. Veterinary journal, 249, 53-57 . https://doi.org/10.1016/J.TVJL.2019.05.007.

  12. Boozer, L., Platt, S., Haley, A., Linville, A., Kent, M., Barron, L., Nie, B., & Arnold, R. (2015). Pharmacokinetic evaluation of immediate- and extended-release formulations of levetiracetam in dogs.. American journal of veterinary research, 76 8, 719-23 . https://doi.org/10.2460/ajvr.76.8.719.

  13. Berk, B., Law, T., Packer, R., Wessmann, A., Bathen-Nöthen, A., Jokinen, T., Knebel, A., Tipold, A., Pelligand, L., Meads, Z., & Volk, H. (2020). A multicenter randomized controlled trial of medium‐chain triglyceride dietary supplementation on epilepsy in dogs. Journal of Veterinary Internal Medicine, 34, 1248 - 1259. https://doi.org/10.1111/jvim.15756.

  14. McGrath, S., Bartner, L., Rao, S., Packer, R., & Gustafson, D. (2019). Randomized blinded controlled clinical trial to assess the effect of oral cannabidiol administration in addition to conventional antiepileptic treatment on seizure frequency in dogs with intractable idiopathic epilepsy.. Journal of the American Veterinary Medical Association, 254 11, 1301-1308 . https://doi.org/10.2460/javma.254.11.1301.

  15. Goiz-Márquez, G., Caballero, S., Solís, H., Rodríguez, C., & Sumano, H. (2009). Electroencephalographic evaluation of gold wire implants inserted in acupuncture points in dogs with epileptic seizures.. Research in veterinary science, 86 1, 152-61 . https://doi.org/10.1016/j.rvsc.2008.05.019.

  16. Begg, E., & Chin, P. (2012). A unified pharmacokinetic approach to individualized drug dosing.. British journal of clinical pharmacology, 73 3, 335-9 . https://doi.org/10.1111/j.1365-2125.2011.04089.x.

  17. Tomson, T., Dahl, M., & Kimland, E. (2007). Therapeutic monitoring of antiepileptic drugs for epilepsy.. The Cochrane database of systematic reviews, 1, CD002216 . https://doi.org/10.1002/14651858.CD002216.PUB2.

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AUTHOR

Lianne McLeod, DVM, is a former writer for The Spruce Pets, contributing articles for 11 years. Before Dr. McLeod began writing about pet care, she worked several years in small animal practice. She has written extensively about the care and keeping of exotic pets and pet health care. She now researches water quality and chronic disease at the University of Saskatchewan. Lianne McLeod earned her Doctorate of Veterinary Medicine from the Western College of Veterinary Medicine at the University of Saskatchewan. She also received a Bachelor of Science degree in biology from Simon Fraser University. She continued her education and received a Ph.D. in Epidemiology from the University of Saskatchewan. Now, she splits her time between her family, research and writing about pet health for all the animal lovers out there.


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