Antineoplastic agents are medications used to treat cancer by inhibiting the growth and spread of malignant cells. These drugs can work in various ways, such as interfering with cell division, blocking specific enzymes, or targeting cancer cell receptors. They are often classified into categories like chemotherapy, targeted therapy, and immunotherapy. These agents can be administered in different forms, including injections, oral tablets, or infusions. While effective in treating cancer, antineoplastic agents can also cause side effects, as they may affect healthy cells. Monitoring and supportive care are essential during treatment to manage these potential adverse effects.