Relapse is a common phenomenon among former addicts who has undergone a preventive and rehabilitation treatment program. Relaps is a condition of using drugs more than one times after stopping them for a certain period of time depending on one's resistance to a drug withdrawal syndrome. There are various factors that affect the former drug addicts became relaps. Hence, the focus of this study is to explain the external factors of relaps among adult male drug addicts in Cure and Care Service Centre, Kuala Pilah, Negeri Sembilan. This study is a qualitative research that has been using a phenomenology approach using face-to-face interviews and further observation among eight drug addicts who are undergoing rehabilitation programs at CCSC Kuala Pilah. Sample selection was done through purposive sampling techniques and data were analyzed using thematic analysis through an inductive approach that focused on coding to obtain some key themes. The result of the study indicates the external factors such as family, peer and environmental factors play a great role in influencing of relapse. In conclusion, these identified factors illustrate the external influences that cause drug addicts to relapse. Therefore, the researcher proposes a post-rehabilitation module or program done by the responsible agencies after the addicts completed the rehabilitation program as guidance for them to the right direction for efficient recovery.