Herbal Drugs as Immune Booster against Viral Infections

Abstract

The immune system involves both active and passive immunization. The antibodies are devloped against the antigens during active immunization and are permanently stored. But, in case of passive immunization, the antibodies are exposed to the same antigens in every person who are already infected. In order to enhance the immune systems i.e. innate and adaptive immune responses, herbal plants are used as immune booster. Some of the herbal plants have been proved clinically to enhance the immunity that include Morniga oleifera (Drumstick), Azadirachta indica (Neem), Ocimum sanctum (Tulsi), Withania somnifera (Aswagandha), Zingiber officinale (Ginger), Allium sativum (Garlic), Curcuma longa (Turmeric), Emblica officinalis (Amla) etc. Compared to synthetic drugs, the herbal drugs have fewer or less side effects and stimulate the immune system to defend against various foreign pathogens. Even though, herbal medicines are usually considered as safe and effective therapy, but it is clinically proved that if a drug is effective, it would have some side effects. But, sometimes the antioxidant property of herbal medicines is helpful to reduce the toxicities produced by any toxic substances or any drugs. This review aims to encourage the study of various herbal constituents and their role in the treatment of different types of viral infections.