Drug withdrawal can be described as the body’s response towards cold turkey stopping or slowing the use of substances on which the body is dependent. The body may show a response in terms of physiological or psychological changes that alter normal function. It happens when you start taking drugs for a long time and your body becomes dependent on the quantity of that drug to perform certain functions correctly. When the drug is stopped cold turkey or the quantity is reduced, the body has to rely on itself rather than the drug to maintain normal functioning. This sudden shift sometimes results in the changing of brain chemistry and the appearance of certain symptoms that are characterized as withdrawal symptoms.