ANTIBOTOX against the use of botulinum toxin in facial aesthetics. Botox or Botox, formula C6760 H10447 N1743 O2010 S32 is a neurotoxin that is injected into the facial muscles, relaxing them. and reducing wrinkles. It has several possible side effects, such as flu-like headaches, pain, swelling or bruising at the injection site, drooping eyelids or uneven eyebrows, double or blurred vision, crooked smile or drooling, dry eyes or excessive tearing.