Relative Risk is commonly used once the study involves comparison the probability, or chance, of a happening occurring between two teams. Relative Risk is taken into account a descriptive datum, not associate inferential statistic; because it doesnt verify applied math significance. Relative Risk utilizes the likelihood of a happening occurring in one cluster compared to the likelihood of a happening occurring within the alternative cluster. It needs the examination of two divided variables, wherever one variable measures the event and therefore the alternative variable measures the teams. Relative Risk is calculated by dividing the likelihood of a happening occurring for cluster one divided by the likelihood of a happening occurring for cluster a pair of. Relative Risk is extremely kind of like Odds Ratio; but, relative risk is calculated by exploitation percentages, whereas Odds quantitative relation is calculated by exploitation the quantitative relation of odds. Relative Risk values square measure bigger than or adequate to zero. A worth of one indicates a neutral result, the possibility of a happening occurring for one cluster is that the same for a happening occurring for the opposite cluster. Pharmacovigilance Journal discusses the latest research innovations and important developments in this field. Pharmacovigilance Journal is interested in the special fields related to the topics of this Journal.