What Happens During Detox: A Step-by-Step Guide
What Detox Is — and What It Is Not
Detoxification, or "detox," is the process of safely clearing a substance from the body after a period of regular use. In a medical context, it refers specifically to supervised withdrawal management — a short programme (usually 3 to 10 days) in which medical staff monitor symptoms, prevent complications, and make the experience tolerable.
Detox is not treatment for addiction. It is an important first step for many people, but on its own it does not change the underlying patterns that drive substance use. Going through detox without connecting to ongoing treatment is associated with high rates of relapse and, for opioids, an elevated risk of fatal overdose due to reduced tolerance.
Which Substances Require Medical Detox
Withdrawal from alcohol and from benzodiazepines (such as lorazepam, clonazepam, or diazepam) can be medically dangerous and should always be done under medical supervision. Severe alcohol withdrawal can cause seizures and delirium tremens; benzodiazepine withdrawal can cause seizures even after relatively short periods of daily use.
Opioid withdrawal is extremely unpleasant but rarely dangerous in healthy adults. It is nonetheless best managed medically because of the availability of effective medications (including buprenorphine/naloxone and methadone) that ease symptoms and start long-term opioid agonist therapy in the same visit.
Stimulant withdrawal (cocaine, methamphetamine) is generally not dangerous but can involve severe depression, fatigue, and cravings. Cannabis withdrawal is usually mild. Regardless of the substance, a brief clinical assessment is a good idea before deciding whether to attempt withdrawal at home.
Before You Arrive
Most Canadian detox programmes begin with a phone screening to confirm that their level of care matches your clinical picture. They will ask about the substance, the amount and pattern of use, your last use, any previous withdrawal episodes, medical conditions, prescription medications, and mental health history.
Pack simple, comfortable clothing, any prescription medications in their original packaging, a piece of identification, and your provincial health card. Most programmes do not permit personal alcohol, drugs, nicotine products, or large amounts of cash. Call ahead to confirm the specifics — policies vary between centres and between provinces.
Day One
On arrival, you will meet with a nurse or clinician who performs a full intake assessment: vital signs, withdrawal risk (using tools such as the CIWA-Ar for alcohol or COWS for opioids), mental health screening, and medication reconciliation. Based on the assessment, the medical team develops a withdrawal management plan, which may include scheduled or as-needed medications.
You will be shown to your room, given a schedule, and introduced to the routine. Most programmes combine rest, regular meals, medical check-ins, and light structured activities such as short groups or educational sessions. The goal on day one is stabilisation, not intensive therapy.
The Middle Days
Withdrawal symptoms typically peak between 24 and 72 hours after the last use, depending on the substance. For alcohol, this is the window when the risk of seizures and delirium tremens is highest; medical staff will monitor closely and use medications such as benzodiazepines to prevent escalation. For opioids, this is often the window of peak discomfort (muscle aches, GI symptoms, insomnia), managed with medications and supportive care.
As the acute symptoms subside, the focus shifts toward planning what comes next. Counsellors and case managers will discuss residential treatment, outpatient counselling, medication-assisted treatment, housing, and community supports. Use these conversations actively — the transitions out of detox are one of the highest-risk periods in the whole recovery process.
Discharge and What Comes After
A well-run detox programme does not simply release you at the end of the week. The discharge plan should include a concrete next step: a residential bed booked or on a waitlist, an appointment with an outpatient counsellor, a prescription and follow-up for opioid agonist therapy, peer support meetings to attend, and a family doctor or addiction physician to loop in.
If you leave detox without a plan for the next 72 hours, loop back to your intake worker or provincial addiction service before discharge. Going home to the same environment with the same triggers and no plan is the single most common setup for a same-week relapse.
If You Can't Access Detox Right Away
Wait times for publicly funded detox vary by region. While you wait: avoid sudden cessation from alcohol or benzodiazepines without medical guidance, carry naloxone if opioids are involved, never use alone, have a trusted person check on you, and call your provincial addiction service if things get worse. If symptoms escalate or you feel unsafe, a hospital emergency department is an appropriate place to go.