Immunostimulants (immunostimulators) are drugs that stimulate the immune system by increasing the activity of any of its components. The immune system is a complex network of cells, tissues, and organs. Together, they help the body fight infections and diseases.
Immunostimulants can enhance body's resistance against various infections through increasing the basal levels of immune response. These agents could increase the oxidative activity of neutrophils, augment engulfment activity of phagocytic cells, and stimulate cytotoxic cells as necessary defense mechanisms.