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Lidoflazine, a piperazine derivative with known selectivity for vascular smooth muscle, was evaluated as a possible agent for prophylaxis of cerebral vascular contraction induced by subarachnoid perfusion with serotonin. The animals treated with serotonin (5 X 10(-6) M), had a 60% reduction in the diameter of basilar artery but when pretreated with Lidoflazine (1 mg/kg) intravenously, only had a 20% reduction in diameter (p less than 0.01). Lidoflazine, when administered intravenously at a slow rate will not adversely lower systemic blood pressure and can prevent the contraction of cerebral vessels when the stimulus for contraction is in the subarachnoid space.

The effect of intravenous lidoflazine on serotonin-induced cerebral vascular contraction--an in vivo study.