Abstract
This case report describes a sulfonamide-induced hypothyroid crisis in a 4-year-old Labrador Retriever bitch. Empirical therapy with high-dose trimethoprim-sulfamethoxazole for 10 days produced signs of weakness, ataxia and mental depression and the clinicopathological results supported hypothyroid-induced central nervous system depression. Short-term levothyroxine sodium therapy led to complete resolution of all clinical signs and follow-up thyroid hormone assays ruled out underlying thyroid pathology. This case report is the first to highlight this potentially life-threatening manifestation of sulfonamide-induced hypothyroidism. Sulfonamide combinations are widely used antimicrobials in veterinary medicine and early recognition of this syndrome is critical.
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