[The route of botulinum toxin from cause of food poisoning to medical remedy].

Botulinum toxins are amongst the most poisonous substances known in nature. The discovery and development of this toxin into a medical remedy is one of the most fascinating stories in the history of medicine. German physician Justinus Kerner founded the theory of treating hyperactive disorders with botulinum toxin and Alan Scott was the one to make this happen successfully. Nowadays the toxin is widely used in different indications, and the research is still going on for discovering novel tools for treating e.g. pain.