Which type of drug is primarily used to stimulate the immune response?

Immunostimulants are specifically designed to enhance the immune response. These drugs work by stimulating various components of the immune system, such as increasing the activity of immune cells (like T-cells and macrophages), promoting the production of cytokines, or enhancing the overall functionality of the immune system. This can be particularly useful in scenarios where the body’s immune response needs support, such as in certain infections, cancers, or immunodeficiency disorders.

In contrast, antibiotics function to kill or inhibit the growth of bacteria and are not involved in modulating the immune system directly. Analgesics provide pain relief but do not have a role in stimulating immunity. Antihypertensives are used to manage blood pressure and do not interact with the immune response. Thus, immunostimulants are the correct answer since they directly increase the activity and effectiveness of the immune system.