Mental disorders are common among amphetamine-type-stimulant (ATS) users. The objective of this study was to describe the psychiatric disorders among ATS users admitted to National Institute of Mental Health. Methods: 44 ATS-induced mental disorders patients were admitted to the MIMH for evaluation during August 2011 and August 2012. A cross sectional-study was applied. Results: Among the patients were 91 percent are man and 9 percent are women with age ranging from 19 to 20 years old. Delusion is a common psychotic episodes observed. Among these patients (68.2 percent), experience of delusion of persecutory was up to 90 percent, and suspicious delusion was raised to 83.3 percent. The other commonly seen hallucination symptom among these patients was auditory hallucination (56.8 percent), visual delusion (22.5 percent) and touch delusion (5 percent). The stress state caused by these delusionary episodes often lead to violent behavior problems, including both homicide and suicide tendency.