Background and Purpose: Drug addiction is a complex disease specified by exacerbation and repetition, uncontrollable penchant, with involuntary seeking for drugs and continuous consumption of that, with its horrible and destructive results. According to the problems which we would be faced with them during drug addiction treatment, this article is going to study on these problems. method: For this study the theoretical foundations and retaining the existing research literature on the subject was discussed. Results: In this paper, the problems related with addiction treatment, the history of drug addiction treatment, the role of opioid preservative (Methadone and Buprenorphine) and its advantages (such as reducing criminal activities, increasing productivity, improving physical functions, Social and mental health, and limiting the blood-borne pathogens) and the weakness (such as the common side effects of constipation, dizziness, dry mouth, headache, increased transpiration, itching, nausea, sleep problems, and psychiatric disorders) are presented.Conclusion: Although long-term and even short-term addiction prevention and treatment programs will be effective, but the large population of domestic drug users remains a major concern for researchers, their families, therapists, and legal responses. An effective treatment process is one of the major challenges of contemporary research and clinical practice that should help clients to defense with destructive effects of brain addiction and behavior, and regaining control of life and restoring clients to productive functions in the family, workplace and community. addiction treatment using chemical drugs is one of the most difficult, most dangerous, and most responsible drug treatments, and the doctors should also be fully trained in the correct administration of agonist medications, and they must be so patient and educated to their patients. Key words: Addiction, Pharmacotherapy, Conservative treatment, Treatment problems, The effectiveness of treatment, relapse, prevention