A three-year seven-month-old female spayed Cavalier King Charles spaniel was diagnosed with idiopathic epilepsy. Because of poor seizure control, the dog was started on oral treatment with potassium bromide as adjunctive treatment to phenobarbital. The dog presented eight days following bromide loading, having developed sedation, general proprioceptive ataxia and generalised appendicular repetitive myoclonus. The serum bromide concentration was 15.9 mg/ml (target range 1 mg/ml to 2.5 mg/ml), which was suggestive of a bromide overdose. The dog improved after reduction of bromide dosing and no similar episodes were reported by the owners at a follow up of 26 months. To the authors’ knowledge this is the first report describing generalised repetitive myoclonus related to bromide toxicity.
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