Firman Firman, Yeni Karneli, Zikry Latupasjana, Abu Yazid Abu Bakar
Nowadays, drug abuse among Indonesian teenagers is increasing. Drug crime cases involving users in 2010 totalled 26,678 cases and increased to 40,897 cases in 2016. Group guidance services in the implementation of counselling guidance in schools have not been fully utilized in efforts to prevent drug abuse among adolescents. This study aims to determine the effect of preventing drug abuse through group guidance services using the Gestalt counselling approach in increasing student self-control. The type of research used is pre-experiment with The One Group Pre-test Post-test Design. This study did not use a control group because it only gave treatment to the group that had problems. The subjects in this study were selected using a non-random sampling technique, with a purposive sampling method, in this study the research subjects were selected based on students' low self-control. Self-control is known from the results of the pre-test. The sample in this study was 15 students in the Vocational School of West Sumatra Province who experienced low self-control in the category. Data was tested for the normality and homogeneity and was analysed using the Paired Samples t-test. The results showed that there was a significant change in self-control after being given group guidance services using the Gestalt counselling approach. Group guidance with Gestalt counselling is effective for increasing self-control in preventing drug abuse in adolescents.