Rehabilitation for drug or alcohol addiction typically works in three overlapping phases: stabilizing your body through detox, changing your thinking and behavior through therapy, and building a plan to stay sober after you leave. The process can last anywhere from a week-long detox to 90 days or more of structured treatment, depending on the substance, how long you’ve been using, and what level of care you need. Here’s what actually happens at each stage.
Detox: The First Few Days
Rehab almost always starts with detoxification, the period where your body clears the substance while medical staff manage withdrawal symptoms. The average length of stay for detox is roughly 7 to 8 days, though this varies widely. Alcohol and benzodiazepine withdrawal can be medically dangerous and often requires close monitoring, while opioid withdrawal is intensely uncomfortable but rarely life-threatening on its own. Stimulant withdrawal tends to be less physically severe but can bring heavy fatigue and depression.
During detox, a medical team tracks your vital signs, manages symptoms like nausea, tremors, anxiety, or insomnia, and may provide medications to ease the process. The goal isn’t just to get you through withdrawal safely. It’s to stabilize you enough to engage in the therapy that comes next. Detox alone, without follow-up treatment, has very low success rates.
How Therapy Changes the Pattern
Once you’re physically stable, the core of rehab begins: behavioral therapy designed to help you recognize what drives your substance use and develop new ways to handle those triggers. This is where most of the lasting work happens, and it’s the reason rehab programs run for 30, 60, or 90 days rather than just the length of detox.
Cognitive-behavioral therapy (CBT) is one of the most widely used and studied approaches. It works by helping you identify the thought patterns and situations that lead to using, then teaching concrete coping skills to respond differently. Large clinical trials funded by the National Institutes of Health found CBT effective for both alcohol and cocaine use, and one notable feature is that its benefits tend to grow after treatment ends. People often get better at applying the skills over time, not worse.
Motivational interviewing takes a different angle. Rather than teaching skills directly, it helps you work through your own ambivalence about quitting. A therapist guides you toward recognizing the gap between where you are and where you want to be, strengthening your own motivation rather than imposing it from outside. This approach has shown positive results across a wide range of populations, from college-age drinkers to adolescents using cannabis to people with co-occurring mental health conditions. A condensed four-session version called Motivational Enhancement Therapy produced strong outcomes in the same major alcohol treatment trial that validated CBT.
Most rehab programs don’t rely on a single method. You’ll typically experience a mix of individual therapy, group sessions, and peer support meetings throughout a given week. Group therapy lets you practice social skills and hear from people at different stages of recovery. Many programs also incorporate family therapy, since addiction rarely affects just one person.
Medications That Reduce Cravings
For opioid and alcohol addiction specifically, medications can make a significant difference in whether treatment sticks. This isn’t replacing one drug with another. These medications target the brain chemistry that drives cravings and relapse.
For opioid use disorder, the FDA has approved three medications. One partially activates the same brain receptors that opioids target, easing cravings and withdrawal without producing a high at therapeutic doses. Another works similarly but requires dispensing at a specialized clinic. The third takes the opposite approach: it blocks opioid receptors entirely, so if you did use, you wouldn’t feel the effects. All three have been demonstrated to be safe and effective, and they can be continued long after you leave a rehab facility.
For alcohol use disorder, medications work by reducing the rewarding effects of drinking or by easing the physical discomfort that makes early sobriety difficult. These are typically started during or shortly after detox and continued for months as part of an outpatient plan.
Not everyone in rehab needs or wants medication, and it’s never the only component of treatment. But for opioid addiction in particular, combining medication with therapy produces significantly better outcomes than therapy alone.
Inpatient vs. Outpatient Programs
Rehab comes in several levels of intensity, and the right one depends on your situation. Inpatient (residential) treatment means living at the facility full-time, typically for 28 to 90 days. You’re removed from your daily environment, have 24-hour support, and follow a structured schedule of therapy, meals, exercise, and downtime. This is generally recommended for people with severe addiction, a history of relapse, unstable living situations, or co-occurring mental health conditions.
Outpatient programs let you live at home while attending treatment sessions several times a week. Intensive outpatient programs (IOPs) usually involve 9 to 20 hours of programming per week, while standard outpatient care might be a few hours. These work well for people with strong support systems, stable housing, and milder or more recent substance use problems. Many people step down from inpatient to outpatient care as a transition.
Why Recovery Takes Longer Than Treatment
Addiction changes the brain in ways that persist well beyond the last dose. Brain imaging studies show that even after a month or more of sobriety, exposure to drug-related cues still triggers rapid activation in the brain’s reward pathways. This neuroplasticity, the physical rewiring that addiction creates, can last for years. It’s the reason someone can feel blindsided by a craving long after they thought they were past it.
This is also why rehab programs emphasize aftercare planning before discharge. A good program will help you set up ongoing outpatient therapy, connect with support groups, identify sober housing if needed, and create a concrete relapse prevention plan. The weeks and months after leaving a structured program are the highest-risk period, and having a plan in place makes a measurable difference.
Relapse doesn’t mean failure. Addiction functions as a chronic condition with relapse rates similar to those of diabetes, hypertension, and asthma. If relapse happens, it signals a need to adjust the treatment approach, not to abandon it.
Paying for Rehab
Cost is one of the biggest barriers to entering treatment, but legal protections have expanded coverage significantly. Under the Mental Health Parity and Addiction Equity Act, health insurers that cover mental health benefits cannot apply stricter financial requirements or treatment limitations to substance use disorder care than they do to medical or surgical care. That means your copay, deductible, and out-of-pocket maximum for rehab must be comparable to what you’d pay for other medical treatment.
Beyond parity rules, the Affordable Care Act requires individual and small group health plans to cover mental health and substance use disorder services as one of ten essential health benefit categories. This means most marketplace plans must offer some level of addiction treatment coverage. Medicaid also covers substance use treatment in every state, though the specific services and providers vary. Many rehab facilities have financial counselors who can verify your insurance benefits and help identify options if you’re uninsured, including state-funded programs and sliding-scale fees.