Drug addiction is a physical and psychological inability to stop consuming a substance or drug, even though it is causing harm to your body. The term addiction is referred to as drug dependence on substances such as opioids and alcohol. A person who cannot stop drinking alcohol or taking opiates has a drug dependence. Nevertheless, drug addiction can be treated with effective medications, such as naltrexone and acamprosate. Naltrexone is effective at treating opioid and alcohol addiction, while acamprosate is good for alcohol addiction.