What Is Levetiracetam and What Does It Treat?
Levetiracetam is an anticonvulsant (anti-seizure) medication used in dogs to help control epilepsy and recurrent seizures. It is widely known by the human brand name Keppra, and is used off-label in veterinary medicine, where it has become one of the most popular anti-seizure drugs.
The exact way levetiracetam works is not fully understood, but it is believed to act on a protein in nerve-cell membranes called SV2A, helping to calm the abnormal, excessive electrical activity in the brain that produces seizures. Its mechanism is different from older anti-seizure drugs, which is part of what makes it useful.
Veterinarians use levetiracetam in several ways:
- As an add-on medication for dogs whose seizures are not fully controlled by another drug such as phenobarbital or potassium bromide
- As a first-line anti-seizure medication in some dogs
- For cluster seizures and certain emergency or “pulse” protocols, under veterinary direction
Levetiracetam has become popular for good reasons. It is generally very well tolerated, has relatively few drug interactions, and — unlike some older anticonvulsants — does not typically require routine liver monitoring. Its main practical drawback is that the standard form needs three-times-daily dosing.
Levetiracetam is a prescription medication, and seizure management is something that must be directed by a veterinarian. Use the calculator above to understand the typical dose, but the actual plan belongs with your vet. For more, see PuppaDogs’ guide to Keppra for dogs.
How the Levetiracetam Dosage Calculator Works
The calculator estimates a dose from your dog’s body weight and the formulation — immediate-release or extended-release. It then:
- Shows the dose per administration, the frequency and the daily total.
- Converts it into tablets or millilitres of oral solution.
- Flags kidney disease and the interaction with phenobarbital.
Enter your dog’s weight, choose the formulation and the strength you have, tick any health considerations, then press Calculate Dose.
How Levetiracetam Doses Are Calculated for Dogs
Immediate-Release and Extended-Release
Levetiracetam comes in two main forms, with different dosing:
- Immediate-release (IR): the typical dose is 20 mg/kg, every 8 hours (three times daily). The dose may be increased — up to around 60 mg/kg per dose — on veterinary advice if seizure control is inadequate.
- Extended-release (ER): designed for twice-daily dosing, the typical dose is around 30 mg/kg every 12 hours. ER tablets must be swallowed whole, never split or crushed.
The extended-release form is a real convenience for households that cannot manage an every-8-hours schedule, though it is only practical for dogs large enough to use whole ER tablets.
Factors That Adjust the Dose
- Kidney function — levetiracetam is cleared mainly by the kidneys, so dogs with kidney disease usually need a lower dose or longer interval.
- Phenobarbital — dogs also on phenobarbital may clear levetiracetam faster and need a higher dose or shorter interval.
- Seizure control — ultimately the dose is adjusted to how well the seizures are controlled.
Levetiracetam Dosage Chart for Dogs
This chart shows the immediate-release dose (20 mg/kg every 8 hours). It is a reference only — your veterinarian’s prescription takes priority.
| Dog weight | Per-dose (IR, 20 mg/kg) | Frequency |
|---|---|---|
| 5 kg (11 lb) | ~100 mg | every 8 h |
| 10 kg (22 lb) | ~200 mg | every 8 h |
| 20 kg (44 lb) | ~400 mg | every 8 h |
| 30 kg (66 lb) | ~600 mg | every 8 h |
| 40 kg (88 lb) | ~800 mg | every 8 h |
Levetiracetam Forms and Strengths
- Immediate-release tablets: 250, 500, 750 and 1000 mg.
- Extended-release tablets: commonly 500 and 750 mg — must be given whole.
- Oral solution: typically 100 mg/mL — useful for small dogs and accurate dosing.
- An injectable form exists for in-hospital emergency use.
How to Give Levetiracetam to Your Dog
- Keep to the schedule. For the immediate-release form, doses should be evenly spaced every 8 hours — consistency keeps seizure control steady. The extended-release form is given every 12 hours.
- With or without food — either is fine.
- Swallow ER tablets whole — never split or crush extended-release tablets.
- Hide tablets in a treat, or measure the oral solution with a proper syringe.
- Do not skip doses. A missed dose can leave a dog vulnerable to a seizure.
- Keep a seizure diary — recording the date, time and nature of any seizures gives your veterinarian the information needed to fine-tune the dose.
Side Effects and Safety Warnings
Levetiracetam is one of the best-tolerated anti-seizure medications used in dogs. When side effects occur they are usually mild and temporary, most often in the first week or two:
- Mild sedation or drowsiness
- A slightly unsteady or wobbly walk
- Occasionally, behaviour changes or mild restlessness
- Sometimes mild digestive upset or reduced appetite
These commonly ease as the dog adjusts. Serious side effects are uncommon.
The Most Important Safety Rule
Never stop levetiracetam — or any anticonvulsant — abruptly. Suddenly withdrawing a seizure medication can trigger severe, prolonged or repeated seizures, including potentially life-threatening status epilepticus. Any change to an anti-seizure drug must be made gradually and only under veterinary guidance.
When to Use Caution
- Kidney disease — needs dose adjustment.
- Pregnant or nursing dogs — uncontrolled seizures are themselves dangerous, so treatment is often continued; your vet will weigh the balance.
- Always tell your veterinarian about every other medication your dog takes.
A Note on the “Honeymoon Effect”
Some dogs show an excellent initial response to levetiracetam that appears to diminish over several months — a phenomenon sometimes called the “honeymoon effect.” If your dog’s seizure control seems to slip after a good start, this is a recognised pattern: do not lose heart and do not stop the medication — instead, return to your veterinarian, who can adjust the dose or the overall plan.
Treatment Duration and Monitoring
For a dog with epilepsy, anti-seizure medication is usually a long-term, often lifelong treatment. Your veterinarian will monitor seizure frequency and severity (this is where your seizure diary is invaluable), check on side effects, and may occasionally check blood levels. The dose is adjusted over time to achieve the best possible control with the fewest side effects. PuppaDogs also covers related medications such as phenobarbital, potassium bromide and zonisamide.
Conclusion
Levetiracetam (Keppra) is a well-tolerated, effective anti-seizure medication for dogs, dosed at about 20 mg/kg every 8 hours for the immediate-release form, or 30 mg/kg every 12 hours for extended-release. The calculator above gives you that estimate and converts it into tablets or liquid. The keys to using it well are consistent dosing, keeping a seizure diary, never stopping it abruptly, and working closely with your veterinarian to fine-tune the dose. With good management, many dogs with epilepsy live full, happy lives.
Frequently Asked Questions
How much levetiracetam do I give my dog?
For the immediate-release form, the typical dose of levetiracetam for dogs is about 20 mg/kg of body weight every 8 hours (three times daily). The extended-release form is dosed around 30 mg/kg every 12 hours. The dose may be increased on veterinary advice if seizure control is inadequate. Always confirm the dose with your veterinarian.
Can levetiracetam be given twice a day instead of three times?
The standard immediate-release form is designed for three-times-daily (every 8 hours) dosing. An extended-release form exists specifically for twice-daily dosing, at around 30 mg/kg every 12 hours, which suits households that cannot manage an 8-hourly schedule. Extended-release tablets must be swallowed whole. Your veterinarian decides which form is best.
What are the side effects of levetiracetam in dogs?
Levetiracetam is one of the best-tolerated anti-seizure medications for dogs. Side effects are usually mild and temporary, most often mild sedation, a slightly wobbly walk, occasional behaviour changes or mild digestive upset, and they often ease within the first week or two as the dog adjusts.
Can I stop giving my dog levetiracetam?
Never stop levetiracetam, or any anti-seizure medication, abruptly. Sudden withdrawal can trigger severe or repeated seizures, including life-threatening status epilepticus. Any change must be made gradually and only under veterinary guidance. Seizure medication is usually a long-term, often lifelong, treatment.
Does levetiracetam stop working in dogs over time?
Some dogs show an excellent initial response that appears to fade over several months – sometimes called the honeymoon effect. If your dog’s seizure control seems to slip after a good start, do not stop the medication; return to your veterinarian, who can adjust the dose or the overall treatment plan.
Does my dog need blood tests while on levetiracetam?
Levetiracetam generally does not require the routine liver monitoring that some older anticonvulsants need, which is one of its advantages. Your veterinarian may still occasionally check blood levels and overall health, and will adjust the dose mainly based on seizure frequency – which is why keeping a seizure diary is so valuable.
Related PuppaDogs Calculators
Continue building your dog’s personalised care plan with these related PuppaDogs calculators:
- Dog Pregnancy / Whelping Due-Date Calculator
- Puppy Weight Predictor (Adult Weight Calculator)
- Heatstroke Risk Calculator for Dogs
- Bloat (GDV) Risk Calculator for Dogs
- Dog Life Expectancy Calculator (Breed, Body Condition, Lifestyle)
- Spay/Neuter Timing Calculator for Dogs (Breed-Specific)
References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Plumb DC. Plumb’s Veterinary Drug Handbook. 10th ed. Hoboken, NJ: Wiley-Blackwell, 2023 – levetiracetam monograph.
- Merck Veterinary Manual. Epilepsy and seizure disorders in dogs – anticonvulsant therapy. merckvetmanual.com.
- Charalambous M, et al. Antiepileptic drugs’ tolerability and safety – a systematic review and meta-analysis in dogs with idiopathic epilepsy. BMC Veterinary Research, 2016.
- International Veterinary Epilepsy Task Force (IVETF). Consensus proposals on canine epilepsy. BMC Veterinary Research, 2015.
- PuppaDogs. Keppra for Dogs: Benefits, Dosage, Side Effects, and More. puppadogs.com.
