The First 72 Hours of Medical Detox: What to Expect

Before you arrive

Two things make the first day easier. Bring a list of everything you take, including the substances you are detoxing from, how much, and when you last used, because the medical plan depends on it and there is no penalty for honesty. And do not try to quit early to impress anyone. Arriving in withdrawal is expected; arriving in withdrawal that started two days ago because you wanted to show you could is harder on you and on the nurses. Our packing guide covers the practical side.

Hours 0 to 4: intake

A nurse takes your vital signs, a brief physical history, and a mental health screening that includes questions about suicidal thoughts; answer them straight, because the answers shape how closely you are watched, not whether you are admitted. You give a urine sample and often a breath alcohol reading. Your medications are reconciled against the list you brought and any pharmacy records the program can pull. Your belongings are inventoried and anything prohibited is held for you. Somewhere in this stretch you meet the nurse who will be with you overnight and a physician or nurse practitioner who writes the initial orders.

The single most useful thing you will do in these hours is describe your withdrawal history: seizures, delirium tremens, prior detoxes, how bad it got. That history predicts this one.

Hours 4 to 24: stabilization begins

Medication starts, chosen for what you are withdrawing from. For alcohol, that usually means a benzodiazepine such as chlordiazepoxide, lorazepam, or diazepam, given on a schedule or in response to symptoms scored on a standard scale, plus thiamine and other vitamins, given before anything sugary because of a rare but serious brain complication of alcohol depletion. For opioids, it means buprenorphine once you are in enough withdrawal for it to help rather than hurt, or clonidine and comfort medications if buprenorphine is not the plan, and a discussion about continuing medication for opioid use disorder after discharge. For benzodiazepines, it means a controlled taper that will outlast your stay. Fluids and electrolytes, anti-nausea medication, and something for sleep round out the first orders.

Nurses check your vital signs and score your symptoms every few hours around the clock, more often if you are unstable. You will be woken for this. It is not optional.

Hours 24 to 72: the peak

This is the window the whole unit is built around. For alcohol, seizure risk peaks in the first day or two and delirium tremens, if it is going to happen, tends to begin around 48 to 72 hours; the medication schedule is designed to stop both before they start, and in a supervised unit they usually are stopped. For short-acting opioids including fentanyl, symptoms peak around day two or three: aches, cramps, vomiting, diarrhea, insomnia, and a craving that feels like a physical need. For stimulants, the crash is deepest here, with long sleep and low mood. Our detox guides each include a timeline for the substance.

Expect to feel worse before you feel better, and expect the staff to seem unbothered by it. That is experience, not indifference. Say so if something is not being managed; the scoring scales are only as good as what you report.

Sleep, food, phones, and people

Sleep is broken by the checks and by withdrawal itself; it improves after day three. Food is offered on a schedule and nobody minds if you skip it early, though eating something helps more than people expect. Phones are usually held during this window and returned in stages, and calls to family are scheduled through staff; the reason is that people who leave against medical advice in the first three days almost always leave in the middle of a phone call. Visitors are generally not allowed until after the acute phase. Groups may start on day two or three when you can sit through one.

Day three: the turn

By the end of the third day, most people are past the worst of the physical symptoms and the conversation shifts to what happens next. A case manager or counselor will talk to you about the level of care that follows detox, your insurance, where you will sleep, and whether medication continues. This is the most important conversation of the stay, and the right time to have it is now, while you are still in the building, not on the phone the week after. Read what comes after detox so you know what to ask for.