Cytotoxic medications have what primary effect on cancer cells?

Cytotoxic medications are specifically designed to poison or destroy cancer cells. These drugs function by interfering with the cell cycle, ultimately leading to cell death. Cancer cells are characterized by uncontrolled growth and division, and cytotoxic agents are used to target these rapidly dividing cells. By disrupting processes such as DNA replication or mitosis, these medications effectively reduce the number of cancer cells and slow the progress of the disease.

The other options do not align with the fundamental purpose of cytotoxic medications. For example, stimulating the growth and reproduction of cancer cells or enhancing their resilience would contradict the intended use of these drugs, which is to hinder and eliminate those cells rather than support their proliferation or survival. Similarly, repairing damaged cells does not pertain to the goal of cytotoxic agents, as their primary function is to induce damage rather than promote healing or regeneration.