Anexperimental study is conducted to assess the effectiveness of abdominal breathing exercise in reduction of blood pressure among hypertensive patients admitted in Railway Hospital at Khurda Road Division, Odisha. Pre–test post–test control group design is undertaken. Convenient sampling technique is used to select the 40 hypertensive (20 Experimental & 20 control group) patients. By using the Blood pressure monitoring table the Pre& Post assessment of MAP of both experimental and control group is recorded. Experimental group is only performed abdominal breathing exercise and BP measured after one hour of pre& post assessment. The findings of study reveals that the Post–test MAPof experimental groupis (104.17 & SD is 2.61) has been significantly reduced in comparison to control group (MAP is 113.25 & SD is 2.62). There is no significant association found. The study reveals that abdominal breathing exercise is effective complementary therapy in reducing blood pressure.