Pharmacovigilance is the study and practise concerned with the identification, evaluation, comprehension, and avoidance of side effects or any other issue involving drugs or vaccines. Before being approved for use, all medications and vaccines go through extensive clinical trials to test their safety and effectiveness. The health care team must be properly trained by national pharmacovigilance centres to identify and record any adverse drug events. The WHO has authorised these facilities, including those in nations participating in the WHO Program for International Drug Monitoring. The significance and roles of pharmacovigilance are important; they have grown over time to include a variety of patient safety-related fields.