Side effects, that square measure usually minor and temporary,can be expected from the mode of action (muscle paralysis) andchemical structure (protein) of the molecule, resulting, loosely, in 2 major areas of facet effects: dysfunction ofthe wrong muscle cluster and aversion. Bruising at the positioning of injection could be a facet result not of the poisonous substance, but ratherthe mode of administration. In cosmetic use, this could lead to inappropriate face expression, like drooping palpebra,double vision, uneven smile, or loss of the flexibility to shut eyes. this may wear off in around six weeks. Bruising is prevented by the practician applying pressure to the injection web site, however should still occur, and can last around seven to elevendays.