People who start taking drugs becomes addicted with the feelings of euphoria and the temporary feeling of well-being associated with their intake. Such things leads to increased consumption and more addiction. Once addicted it is very difficult for a person to get rid of the habit. The discontinuation results in the manifestation of withdrawal syndrome. Withdrawal syndrome is characterized by anxiety, shakiness, nausea, vomiting, increased heart rate, uneasiness, all of which are relieved only on the consumption of the drug. In some cases the withdrawal symptoms may be severe and life threatening. Moreover the psychological dependence makes it very difficult for the individual to get rid of the addiction.