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Table 2 Most common reported adverse effects seen in dogs treated with levetiracetam, zonisamide, felbamate, topiramate, gabapentin, and pregabalin (rarely reported and/or idiosyncratic adverse effects are indicated in grey

From: International Veterinary Epilepsy Task Force consensus proposal: medical treatment of canine epilepsy in Europe

AED Adverse effects in dogs
Levetiracetam Sedation
  Ataxia
  Decreased appetite or anorexia
  Vomiting
  Behavioural changes
Zonisamide Sedation
  Ataxia
  Vomiting
  Inappetence
 
 
Felbamate Keratoconjunctivitis sicca
  Thrombocytopenia
  Lymphopenia and leucopenia
Topiramate Sedation
  Ataxia
  Weight loss
Gabapentin Sedation
  Ataxia
Pregabalin Sedation
  Ataxia
  Weakness