Botulinum toxin therapy of migraine and tension-type headache: comparing different botulinum toxin preparations.

Most of the initial reports on botulinum toxin in tension-type headache (TTH) and in migraine were positive. Unfortunately, these results were not reproduced in well-designed, randomized controlled trials. So far, doses from 20 U (Botox) to 500 U (Dysport) have been studied in patients with chronic TTH, and doses from 16 to 200 U (Botox) in patients with migraine. Overall, there is no evidence for a beneficial effect of botulinum toxin, although trends favoring botulinum toxin were reported. Experience with botulinum toxin type B (Myobloc/NeuroBloc) is limited and similar to the experience with the type A. Thus, a widespread use of botulinum toxin therapy in headache can currently not be recommended.