[영문]Objective. We determined how Asian and Pacific Islanders (APIs) differ fromclients from other ethnic groups in regard to drug use and admissions to drugtreatment programs.Methods. We used national survey and treatment admissions data to characterizedrug problems and first-time adult admissions to publicly funded drugtreatment programs in the U.S. in 2005.Results. APIs accounted for 1.9% of illicit drug use in U.S. adults and for 1.3%of adult clients entering drug treatment for the first time. Compared with otherethnic groups, APIs were significantly more likely to be entering treatmentfor the first time. Stimulants were the primary drug problem for 57.3% of APIfirst-time treatment clients, a significantly greater proportion than other ethnicgroups. This figure had increased from 45.3% in 2001, significantly greater thanthe increase among Caucasian or African American clients. API first-time admissionshad used drugs less frequently (13.6 days in the prior 30 days), begandrug use at a slightly older age (mean 5 20.7 years), and had a shorter periodbetween start of use and first admission (mean 5 9.4 years) than other racial/ethnic groups.Conclusion. Stimulant use was the predominant problem of API clients enteringtreatment for the first time. APIs were underrepresented in the treatmentsystem relative to their share of the population with drug problems. Diversegroups were aggregated to form the API category. Information on APIs needsto be disaggregated to develop more culturally appropriate and effectivetreatment.