In this study effectiveness of planned health teaching on knowledge of Attention Deficit/Hyperactive Disorder (ADHD) among nursing students was studied using structured questionnaire on knowledge regarding ADHD. The research design used in the study was one group pretest and post test pre experimental design. The knowledge regarding ADHD was assessed before and after the planned health teaching. The conceptual frame work of the study was based on Roy’s Adaptation Model. The study was conducted among 30 nursing students of a selected nursing college by using simple random sampling technique. The data was collected and analyzed based on objectives of the study using descriptive and referential statistics. The objectives of the study were to­ 

1. To assess the pretest knowledge regarding ADHD among nursing students. 

2. To assess the post test knowledge regarding ADHD among nursing students. 

3. To assess the effectiveness of planned health teaching on knowledge regarding attention deficit hyperactivity disorder among students. 

4. To find the association between knowledge regarding attention deficit hyperactivity disorder and selected background variables of the nursing students. 

Mean value at pre­test was 13.4 which increased to 27.4 in post­test. The study revealed that the planned health teaching increased the knowledge on ADHD among nursing students. The effectiveness of planned health teaching was independent of the selected demographic data and baseline data. The study concluded that planned health teaching can play a vital role in imparting knowledge to the nursing students. 

Keywords: Planned Health Teaching; Knowledge; Attention Deficit Hyperactivity Disorder; Nursing Students.