Safety and Efficacy of Botulinum Toxin A in Patients With Posttraumatic Headache

A concentration of 50U/mL BTX-A is prepared using saline in four syringes: one with 1 mL, one with 0.8 mL, one with 0.7 mL, one with 0.6 mL. This equals a total administration dose of 155U. A total of 155U BTX-A will be injected at day 1 (first day in week 1) by subcutaneous injections according to the PREEMPT protocol.