The Canine Ledger

Living With Epilepsy: When Treatment Starts, and What Monitoring Involves

When vets start long-term seizure medicine for dogs, what treatment can realistically achieve, the blood checks involved, and when a seizure is an emergency.

Written by thecanineledger

A seizure lasting more than five minutes, or seizures that keep coming close together, is an emergency. Go to a vet now. The American College of Veterinary Internal Medicine describes status epilepticus as “any prolonged seizure lasting >5 minutes” (Charalambous et al., J Vet Intern Med 2024). → Emergency Signs in Dogs: When to Go Now, Not Tomorrow

“Seizure eradication is often not likely in dogs.” That’s the International Veterinary Epilepsy Task Force (IVETF), in its 2015 consensus on treating canine epilepsy (Bhatti et al., BMC Vet Res 2015).

While that sounds bleak, it’s the starting point for realistic goals, and many dogs with epilepsy live well. This page covers when vets usually start long-term medicine, what it aims to do, what monitoring involves, and what owners can do.

1. What epilepsy is

Epilepsy means repeated seizures caused by the brain itself. Merck’s veterinary manual puts its prevalence in dogs at “0.5% to 0.82% in nonreferral populations”, higher in some breeds (Merck Veterinary Manual, Epilepsy in Small Animals).

It’s usually classed as idiopathic, which is typically genetic, or structural, caused by something like a tumour or injury in the brain. Seizures can also come from outside the brain, such as poisoning or low blood sugar. The IVETF notes that idiopathic epilepsy “remains most commonly a diagnosis of exclusion”: the vet rules out other causes first.

→ Flea and Tick Tablets and Seizures: What the FDA Warning Means

2. When treatment starts

One seizure doesn’t usually mean lifelong medicine. The IVETF admits that “Definitive, evidence-based data on when to start AED therapy in dogs based on seizure frequency and type is lacking.” (AED means anti-epileptic drug.) Its consensus is to start long-term treatment in dogs with idiopathic epilepsy when any one of these applies:

CriterionIVETF wording
Frequent seizures“2 or more epileptic seizures within a 6 month period”
Dangerous seizures“Status epilepticus or cluster seizures”
Severe after-effectsAfter-effects “considered especially severe (e.g. aggression, blindness) or last longer than 24 hours”
WorseningFrequency, length or severity increasing “over 3 interictal periods”

The IVETF adds that long-term control “is thought to be most successful when appropriate AED therapy is started early”, especially in dogs with frequent seizures and in breeds known for severe epilepsy.

Our note: The IVETF consensus is from 2015 and written for Europe. We haven’t checked for newer guidance.

3. What treatment aims for

The IVETF sets out “realistic goals”: to “decrease seizure frequency, duration, severity and the total number of epileptic seizures that occur over a short time span, with no or limited and acceptable AED adverse effects to maximize the dog’s and owner’s quality of life.”

It counts a 50% or greater drop in seizure frequency as a response to a drug. Merck notes that “Drug-resistant epilepsy is a serious challenge in animals and usually carries a guarded to poor prognosis.”

We don’t name medicines or give doses. Which drugs are licensed for dogs differs by country. Your vet will choose.

Our note: Licensed anti-seizure medicines differ between the US, Canada, the UK and the EU. The IVETF consensus reflects European rules.

4. What monitoring involves

Most anti-seizure medicines need regular checks. The IVETF lists the importance of “regular check-ups to monitor AED blood concentrations as well as haematology/serum biochemistry where appropriate”. These blood tests check that the drug level is right and look for side effects, for example on the liver.

How often depends on the drug. Your vet will set a schedule.

5. What owners can do

The IVETF lists what owners need to understand. In short:

  • It’s often lifelong. Treatment “often is a lifetime commitment”.
  • Give medicine regularly, and only change doses “after consulting a veterinarian”.
  • Keep a seizure diary. The IVETF stresses “the importance of maintaining a detailed seizure diary”: date, time, length and what happened.
  • Never stop suddenly. “abrupt drug withdrawal might be detrimental”.
  • Keep diet steady. Diet, vomiting and diarrhoea can affect how drugs are absorbed. The IVETF advises “to keep the diet constant or to make changes gradually”.
  • Ask about a home emergency plan. The IVETF mentions “the administration of additional AEDs at home” for clusters and status epilepticus.

Our note: The sources we read don’t give first-aid steps for a seizure. Our first seizure page covers what to do.

6. When a seizure is an emergency

The ACVIM consensus says “Seizures are considered an emergency when their duration is prolonged and they are not self-limiting, or when they occur as a closely grouped series”. Go to a vet now if:

  • a seizure lasts more than five minutes;
  • seizures come close together, or your dog doesn’t recover between them.

7. What we could not verify

Commonly saidWhat we found
“One seizure means lifelong medicine”Not usually. The IVETF’s criteria start at two seizures in six months, or a dangerous seizure.
“Medicine will stop all seizures”Often not, the IVETF says. The aim is fewer and milder seizures.
“You can stop epilepsy medicine once seizures stop”Not without your vet. Sudden withdrawal may be harmful.

Sources

Always confirm with your vet before acting on anything on this page.