DRUG ABUSE Dr. S. I. AHMED CHAIRMAN AIDS PREVENTION SOCIETY & President, NORTH EAST INDIA HARM REDUCTION NETWORK ( NEIHRN) DRUGS OF ABUSE – CLASSIFICATION AND EFFECTS Drug and Drug use • A pharmaceutical preparation or a naturally occurring substance used primarily to bring about a change in the existing process or state (physiological, psychological or biochemical) can be called a ‘drug’ • When drugs are used to treat an illness, prevent a disease and improve health condition, it