Mrdvikadi lehya is a special type of Ayurvedic formulation mainly used for respiratory tract infections. Infections are common due to the easy spread of large variety of organisms. It is a major challenge to the health system in developing countries due to high morbidity and mortality rate. Most of the infections occur due to weak immunity in peoples. A healthy immune system can defend against disease causing microorganisms. The Immunity and strength can be enhanced by the use of immunomodulators. The Ayurvedic system of medicine details the concept of immunomodulation by the term Rasayana. Mrdvikadi lehya contains Mrdiveeka (Draksha) and Pippali which have Rasayana property (immunomodulatory effect).