Chronic migraine patients receive small benefit from botulinum

The treatment is also not associated with greater benefits than placebo in preventing episodic migraines or chronic tension-type headaches, US researchers found after pooling data from 27 randomised trials. 

And in comparative effectiveness trials, botulinum toxin A was not superior to valproate, topiramate or amitriptyline, they found.

Compared to placebo, botulinum toxin A was associated with a greater frequency of blepharoptosis, skin tightness, paraesthesias, neck stiffness, muscle weakness and neck pain, the researchers reported.

They

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