A variety of scientifically based approaches to drug addiction treatment exist. Drug addiction treatment can include behavioral therapy (such as counseling, cognitive therapy, or psychotherapy), medications, or their combination.

Agonist Maintenance Treatment for opiate addicts usually is conducted in outpatient settings, often called methadone treatment programs. These programs use a long-acting synthetic opiate medication, usually methadone or LAAM, administered orally for a sustained period at a dosage sufficient to prevent opiate withdrawal, block the effects of illicit opiate use, and decrease opiate craving. Patients stabilized on adequate, sustained dosages of methadone or LAAM can function normally. They can hold jobs, avoid the crime and violence of the street culture, and reduce their exposure to HIV by stopping or decreasing injection drug use and drug-related high-risk sexual behavior.

Patients stabilized on opiate agonists can engage more readily in counseling and other behavioral interventions essential to recovery and rehabilitation. The best, most effective opiate agonist maintenance programs include individual and/or group counseling, as well as provision of, or referral to, other needed medical, psychological, and social services.

Narcotic Antagonist Treatment Using Naltrexone for opiate addicts usually is conducted in outpatient settings although initiation of the medication often begins after medical detoxification in a residential setting. Naltrexone is a long-acting synthetic opiate antagonist with few side effects that is taken orally either daily or three times a week for a sustained period of time. Individuals must be medically detoxified and opiate-free for several days before naltrexone can be taken to prevent precipitating an opiate abstinence syndrome. When used this way, all the effects of self-administered opiates, including euphoria, are completely blocked. The theory behind this treatment is that the repeated lack of the desired opiate effects, as well as the perceived futility of using the opiate, will gradually over time result in breaking the habit of opiate addiction. Naltrexone itself has no subjective effects or potential for abuse and is not addicting. Patient noncompliance is a common problem. Therefore, a favorable treatment outcome requires that there also be a positive therapeutic relationship, effective counseling or therapy, and careful monitoring of medication compliance.

Many experienced clinicians have found naltrexone most useful for highly motivated, recently detoxified patients who desire total abstinence because of external circumstances, including impaired professionals, parolees, probationers, and prisoners in work-release status. Patients stabilized on naltrexone can function normally. They can hold jobs, avoid the crime and violence of the street culture, and reduce their exposure to HIV by stopping injection drug use and drug-related high-risk sexual behavior.

Outpatient Drug-Free Treatment in the types and intensity of services offered. Such treatment costs less than residential or inpatient treatment and often is more suitable for individuals who are employed or who have extensive social supports. Low-intensity programs may offer little more than drug education and admonition. Other outpatient models, such as intensive day treatment, can be comparable to residential programs in services and effectiveness, depending on the individual patient's characteristics and needs. In many outpatient programs, group counseling is emphasized. Some outpatient programs are designed to treat patients who have medical or mental health problems in addition to their drug disorder.

Long-Term Residential Treatment provides care 24 hours per day, generally in nonhospital settings. The best-known residential treatment model is the therapeutic community (TC), but residential treatment may also employ other models, such as cognitive-behavioral therapy. TCs are residential programs with planned lengths of stay of 6 to 12 months. TCs focus on the "resocialization" of the individual and use the program's entire "community," including other residents, staff, and the social context, as active components of treatment. Addiction is viewed in the context of an individual's social and psychological deficits, and treatment focuses on developing personal accountability and responsibility and socially productive lives. Treatment is highly structured and can at times be confrontational, with activities designed to help residents examine damaging beliefs, self-concepts, and patterns of behavior and to adopt new, more harmonious and constructive ways to interact with others. Many TCs are quite comprehensive and can include employment training and other support services on site.

Compared with patients in other forms of drug treatment, the typical TC resident has more severe problems, with more co-occurring mental health problems and more criminal involvement. Research shows that TCs can be modified to treat individuals with special needs, including adolescents, women, those with severe mental disorders, and individuals in the criminal justice system.

Short-Term Residential Programs provide intensive but relatively brief residential treatment based on a modified 12-step approach. These programs were originally designed to treat alcohol problems, but during the cocaine epidemic of the mid-1980's, many began to treat illicit drug abuse and addiction. The original residential treatment model consisted of a 3 to 6 week hospital-based inpatient treatment phase followed by extended outpatient therapy and participation in a self-help group, such as Alcoholics Anonymous. Reduced health care coverage for substance abuse treatment has resulted in a diminished number of these programs, and the average length of stay under managed care review is much shorter than in early programs.

Medical Detoxification is a process whereby individuals are systematically withdrawn from addicting drugs in an inpatient or outpatient setting, typically under the care of a physician. Detoxification is sometimes called a distinct treatment modality but is more appropriately considered a precursor of treatment, because it is designed to treat the acute physiological effects of stopping drug use. Medications are available for detoxification from opiates, nicotine, benzodiazepines, alcohol, barbiturates, and other sedatives. In some cases, particularly for the last three types of drugs, detoxification may be a medical necessity, and untreated withdrawal may be medically dangerous or even fatal.

Detoxification is not designed to address the psychological, social, and behavioral problems associated with addiction and therefore does not typically produce lasting behavioral changes necessary for recovery. Detoxification is most useful when it incorporates formal processes of assessment and referral to subsequent drug addiction treatment.