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The cascade of reactions caused by ischemia in brain tissue is complex and not completely understood, but intensive investigation has led to convincing hypotheses. A disturbed calcium homeostasis and oxygen radicals seem to play a major role in postischemic neuronal damage. In accordance to these hypotheses drugs with different mechanisms of action have been developed. The aim of this paper is to give an overview over pathobiochemical mechanisms in cerebral ischemia and possibilities of pharmacological intervention.