Blind multicenter study of the efficacy and safety of injections of a commercial preparation of botulinum toxin type A reconstituted up to 15 days before injection.

Background: It is recommended that attention be given to the shelf life of botulinum toxin type A (BT-A) after its reconstitution.

Objective: To assess the efficacy and safety of 500 U of BT-A after reconstitution up to 15 days after injection.

Material And Methods: BT-A vials were diluted 15 days, 8 days, and 8 hours before injection.