Pharmacovigilance is a pharmacological science ensuring drug safety and efficacy. It focuses on prevention of adverse drug reactions (ADR), medication errors such as overdose, misuse and abuse of a drug. The aim of pharmacovigilance is to improve public healthcare and enforce safe usage of medicines. In many countries, the importance of pharmacovigilance in drug research and development is growing. Pharmacovigilance of herbal drugs is still a new concept and pharmacovigilance centers face unique challenges in ensuring the safety of herbal medicines.