ABSTRACT
The immune system is a complex and highly developed system in the body. The immune system is a part of body to detect the pathogen by using a specific receptor to produce immediately response by the activation. Immunomodulators are naturally present in the body, and certain of these are available in pharmacologic preparations. Immunomodulators correct immune systems that are out of balance. Some Immunomodulators are naturally present in the body, and certain of these are available in pharmacologic preparations. Knowledge of the mechanism of action of drugs provides targeted drug therapies so, synthetic immunomodulator drugs with their mechanism of action and uses have been listed out. Many botanical species have reported the immunomodulatory activity. It is based on the type of constituents present in the plant extracts so the list of Herbal plants with their chemical constituents and possible mechanism of action has been listed out. This review is an attempt to provide information regarding immune system and immunomodulatory agents.
Key words: Immune system, Immunomodulators.