The experimental study with 50 adolescent girls between 13-17years of age selected through Multi-stage random sampling technique. One group pre test post test design was used. Data was collected by means of a structured questionnaire schedule which was divided into 2 parts (one socio- demographic data, the second part on knowledge and attitude regarding effects of consanguineous marriage on fetus and its prevention). The reliability of the tool was established by Split Half method. The Karl Pearson’s coefficient of correlation r =0.8097, and content validity of the tool was established by 9 experts in the field of obstetrics & gynecological nursing. Data was analyzed by using descriptive and inferential statistical in terms of mean, frequency distribution, percentage‘t’ test and chi-square test.

It was proved that there was increase in the knowledge & attitude regarding effects of consanguineous marriage on fetus and its prevention among adolescent girls, after implementing planned teaching programme, thus planned teaching programme on effects of consanguineous marriage and its prevention was effective.