Levetiracetam (Keppra)
A modern anticonvulsant targeting synaptic vesicle protein SV2A, renowned for its wide safety margin and minimal liver burden.
💬 In Plain English
Levetiracetam (well known by its brand name Keppra) is a modern, widely prescribed anti-seizure medication for dogs and cats. Unlike older seizure drugs like phenobarbital that are broken down by the liver, Keppra is excreted almost entirely by the kidneys. This makes it exceptionally safe for pets with liver disease or older animals. It works by binding to a protein inside nerve endings called SV2A, inhibiting the excessive release of brain neurotransmitters that cause seizures. Regular Keppra must be given three times daily (every 8 hours), but an extended-release version (Keppra XR) is given twice daily (every 12 hours).
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Second-generation pyrrolidine anticonvulsant that selectively binds synaptic vesicle protein SV2A, modulating synaptic exocytosis and suppressing presynaptic neurotransmitter release without significant GABAergic or glutamatergic receptor interaction.
Why Veterinarians Use It
Veterinarians prescribe Keppra as add-on or primary therapy for idiopathic epilepsy and pulse therapy for cluster seizures, especially when liver sparing is required.
Clinical Context Encountered
Given as regular oral tablets (q8h), extended-release tablets (q12h), or emergency IV/rectal doses.
Clinical Reference Guide (Veterinary Medication)
What Owners Must Know
- Regular tablets require strict 8-hour dosing (TID); Keppra XR requires strict 12-hour dosing (BID)
- Never split or crush Keppra XR tablets
- Tolerance ("honeymoon effect") can develop in a subset of dogs after 6–12 months.
Potential Side Effects
- Transient mild sedation or ataxia during first week
- Behavioral changes or agitation (rare)
- •NEVER crush, cut, or split Keppra XR (Extended-Release) tablets: damaging the tablet coating causes the entire 24-hour dose to absorb immediately ("dose dumping"), causing severe sedation followed by lack of seizure control.
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1Is my pet taking regular Keppra (must be given every 8 hours) or Keppra XR (given every 12 hours)?
- 2Why must Keppra XR tablets never be split, crushed, or chewed (which destroys the extended-release coating)?
- 3Should we have emergency extra doses on hand for "pulse therapy" if my dog has cluster seizures?
Academic & Clinical References
- ACVIM Clinical Guidelines: Add-On and Monotherapy Anticonvulsants in Small Animal PracticeOrganization: American College of Veterinary Internal Medicine (ACVIM) • Accessed: 2026-01-10https://www.acvim.org