The study examined the effectiveness of self efficacy component of the health action process approach (HAPA), and religiosity in the treatment of substance use disorders. Results indicated that belief leading to the adoption, initiation and maintenance of health behaviours must be explicitly conceived by patients as a process that consists of at least a motivation phase and volition phase, leading to positive outcomes in compliance and abstinence maintenance for the treatment of substance use disorders. However if patients do not believe in their capability to perform the desired action, they would fail to adopt, initiate and maintain it leading to frequent relapses. Using group cognitive-behaviour therapy among male patients, self efficacy and religiosity were found to be effective components of cognitive behaviour therapy in substance use disorders as this led to high compliance and sustained abstinence over a six month assessment period, when compared with patients who did not have this approach.
Key Words: health action process approach, self efficacy, religiosity, cognitive behaviour therapy, substance use disorders