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An Analysis of the “Carry-over Effect” Following Successful Short-term Treatment of Transformed Migraine With Divalproex Sodium

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Abstract:

Objective.–

To determine whether successful short-term prophylactic treatment of transformed migraine may be followed by a continued respite from headaches once the treatment has been discontinued (“carry-over effect”).Background.–

The optimal duration of prophylactic treatment for pervasive headache and for migraine, in particular, is unknown.Methods.–

We prospectively evaluated a series of patients with transformed migraine, all of whom were managed according to a uniform treatment protocol involving prophylactic therapy with divalproex sodium for a period not exceeding 12 weeks. All patients reporting a positive treatment response were followed for at least 2 months after the discontinuation of divalproex sodium, and the incidence of the carry-over effect in that group was assessed.Results.–

A short-term carry-over effect occurred in 12 (60%) of 20 patients, but more sustained relief occurred in only 8 (40%).Conclusions.–

The successful short-term treatment of transformed migraine with divalproex sodium will often produce a short-term carry-over effect, but this response will be sustained only in a minority of patients.

Keywords: carry-over effect; divalproex sodium; migraine

Document Type: Research Article

Publication date: 2000-01-01

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