Background and objectives:Spontaneous reporting of adverse drug reactions (ADR) is vital for pharmacovigilance. It is important to gain knowledge regarding adverse drug reaction in the undergraduate level. The present study was conducted to assess the knowledge, attitude, and practice (KAP) of ADR reporting among medical students both undergraduate and Post Graduates. Materials & Methods:This was a cross sectional questionnaire-based study conducted among medical students in a teaching hospital, of south India. There was a total of 24 questions of which 10, 8 and 6 were related to Knowledge, Attitude and Practice respectively. Data was analysed using SPSS (Statistical Package for Social Science) version 28 for descriptive and analytical statistics. Results:The respective mean scores of 1 stMBBS, 2ndMBBS and Post Graduate students are (3.04, 7.06, 6.59) for knowledge, (6.54,7.18,7.10) for attitude and (0.01,2.96,2.25) for practice. The KAP of 2nd MBBS students is more compared to other groups and this is statistically significant. Conclusion:Most of the students have positive attitude towards ADR reporting but this was not reflected in their practice. Including ADR reporting as a part of pharmacology practical could be the reason for 2ndMBBS students having better KAP; compared to Post Graduates. Including pharmacovigilance as part of Post Graduate curriculum (irrespective of the specialty) could further improve spontaneous reporting.