cytotoxic drugs kill or damage cells. The normal cells of the body grow and die in a controlled way, but cancer cells keep growing and multiplying. Chemotherapy destroys cancer cells by stopping them from growing or multiplying at one or more points during the life cycle of the cell. Cytotoxicity is the quality of being toxic to cells. Examples of toxic agents are an immune cell or some types of venom, e.g. from the puff adder (Bitis arietans) or brown recluse spider.
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