Difference Between Botox A and B
BOTOX® is a formulation containing botulinum toxin type-A. Botox is approved by the FDA for cosmetic usage. Myobloc® is the only commercially available formulation which contains botulinum toxin type B. Botulinum toxin type-A causes little discomfort during injection, compared with botulinum toxin type-B which can be painful. For the most part, only botulinum toxin type-A is used for cosmetic treatment, because the benefits of treatment with botulinum toxin type A last longer than botulinum toxin type B. The results of cosmetic procedures vary, but Botox A can last up to eight months. Botox Cosmetic temporarily improves the appearance of moderate-to-severe frown lines between the eyebrows.