Botulinum toxin injection induced autoimmune thyroiditis and myxedema coma: A case report.

This case describes a 28-year-old female with amyotrophic lateral sclerosis and recurrent urinary tract infections who developed myxedema coma following a botulinum toxin type-A (Btx) injection for muscle spasticity. On intensive care unit admission, she presented with hypothermia, bradycardia, and reduced consciousness. Laboratory evaluation revealed markedly elevated thyroid-stimulating hormone levels, confirming myxedema coma. Prompt treatment with intravenous levothyroxine and hydrocortisone resulted in rapid improvement in temperature and mental status. Further investigation showed elevated antithyroid peroxidase antibodies, suggesting drug-induced autoimmune thyroiditis triggered by Btx. This case highlights the potential link between Btx injection and thyroid autoimmunity, emphasizing the importance of early recognition and monitoring of thyroid function to prevent life-threatening complications in at-risk patients.