The possibilities of using botulinum toxin beyond the dermatology · Botulinum toxin which is a neurotoxin produced by the bacteria Clostridium botulinum, is one of the most active and best-known biological toxins. Its mechanism of action is associated with proteolysis of specific proteins and prevention of release acetylocholine at presynaptic terminals in neuromuscular junctions. Botulinum toxin is mainly used in aesthetic medicine for reduction of wrinkles and in excessive sweating. Recently, it has been also used beyond the dermatology e.g. in the treatment of migraines, dystonia, bruxism or overactive bladder. Moreover, its beneficial effects on reducing depression and weight loss in obese people are currently investigated in observation and clinical trials.