Drug abuse refers to the illegal and abusive use of substances or drug. Alcohol is the most commonly used legal drug where most of the individuals get addicted and abused to it. This drug addiction induces the brain to consume excessive regular pills which affect the brain and changes the structure of the brain. This uncontrollable use of drugs triggers the limbic system to respond with intense feelings of pleasure. This brain command produces a deep-seated desire to continue using of the drug. Alcohol and drug addiction therapy can help you re-write the effects of drugs in your brain, learn to cope with negative feelings, and learn to avoid and deal with cravings.