Methadone maintenance.
D000293:Adolescent; D000328:Adult; D000368:Aged; D005069:Evaluation Studies as Topic; D005260:Female; D006801:Humans; D008297:Male; D008691:Methadone / Q000627:therapeutic use*; D008875:Middle Aged; D012050:Rehabilitation, Vocational; D019966:Substance-Related Disorders; D013781:Texas
D008691:Methadone