What is the best explanation for the many adverse effects that result from using chemotherapeutics to treat patients with cancer?

Chemotherapeutic drugs often work by damaging or stopping rapidly dividing cells. Cancer cells divide rapidly, but some healthy cells—such as those in hair follicles, the digestive tract, and bone marrow—also divide quickly and can be harmed. This is why the best explanation is that chemotherapeutics are poisonous; their effects are not limited to cancer cells.

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