Substance abuse has become a major problem in any growing society, the pattern of consumption of medical and non-medical use of drugs by preadolescents,adolescents and young adults, is both complex and changing.[1] It’s mainly due toadventurous and risk-taking behaviours, acceptable to peers, curiosity to acquaint oneself with the ecstaticexperiences or due to an inner urge to avoid frustrations and boredom. Substance abuse during secondary schools, colleges and universities is a serious problem in society.[1] The present study aimed to assess the knowledge on effects of substance abuse on health and its preventive measure among adolescents by evaluating the effectiveness of videoassisted teaching module and to find out the association between the pre test level of knowledge on effects of substance abuse on health among adolescence with selected demographic variables. A quasi-experimental pre and post test design without control group with experimental approach was undertaken for this study. 70 adolescence students were selected by purposive sampling and data were collected by using structured knowledgequestionnaire, it was analyzed by using descriptive and inferential statistics. The study result shows highly significant difference between pre and post test knowledge scores and no significant association between the pre test scores when compared to the demographic variables of adolescence. The researcher concluded that video-assisted teaching program was effective in providing the knowledge regarding effects of substance abuse on health and its preventive measure among adolescents.  

Keywords: Video assisted teaching module; Effects of substance abuse on health; Preventive measures among adolescents.