Drug Rehab informtion aboute Drug Rehab - To truly understand the type of treatment that is appropriate for individuals with a chronic drug addiction problem it is important to understand the mechanisms that are at work. Drug addiction could be defined as; a constant and unrelenting effort to obtain drugs in order to alter the feelings and perceptions of the person using them. Another facet of drug addiction is; the brain adapts to the presence of drugs and make adjustments accordingly. Because of these chemical changes in the brain due to the constant use of drugs, when a drug abuser attempts to halt their drug use the brain signals the individual that the drug is needed. This is a major cause of drug cravings.