Alcohol and drug treatment centers have existed since the late 1800's and early 1900's, however at that time they were not called drug rehab centers or alcohol treatment programs, they were called "asylums" and the disease of addiction and alcoholism (as defined by the American Medical Association) was not seen as being a disease or an illness at all.
Drug treatment centers provide rehabilitation services for drug addiction, alcoholism, and co-occurring mental health and substance abuse disorders (dual diagnosis).
Drug treatment centers and alcohol rehab programs exist to help individuals who suffer from addiction and alcoholism learn the tools they need to live happy, healthy lives free from chemical dependency.
Drug rehabilitation and alcohol rehab programs in hospitals are often directly related with the mental health treatment and behavioral health care treatment programs offered, or are combined into dual diagnosis treatment centers.