Opiate Detox: What to Expect During Medical Withdrawal

Medical opiate detox manages opioid withdrawal under 24-hour clinical supervision using FDA-approved medications, vital sign monitoring, and supportive care. Detox is the first phase of inpatient opiate treatment — not a stand-alone solution — and bridges directly into the residential therapy that follows.

What Opiate Detox Is

Opiate detoxification, or "detox," is the medical process of safely clearing opioids from the body and managing the physical and psychological symptoms of withdrawal. In a licensed inpatient detox facility, patients are admitted, assessed by a physician, and started on medications that reduce withdrawal severity while nursing staff monitor vital signs around the clock. Detox typically lasts 5 to 10 days and is the first phase of a complete inpatient opioid treatment program. Without the residential treatment that follows, detox alone has very high relapse rates.

Opiate Withdrawal Timeline (Day by Day)

The exact timeline depends on which opioid the patient was using, the dose, and the duration of use. The following is a general timeline for short-acting opioids such as heroin, oxycodone, and hydrocodone. Fentanyl withdrawal can begin slightly faster and is sometimes more severe.

Hours 6–12: Onset

Mild symptoms begin — anxiety, restlessness, muscle aches, runny nose, watery eyes, sweating, yawning, and intense cravings. The patient may feel like they are coming down with the flu. This is the window in which most patients are admitted to inpatient detox.

Hours 12–36: Building

Symptoms intensify. Insomnia, dilated pupils, goosebumps, abdominal cramping, nausea, loss of appetite, irritability, and stronger cravings. Vital signs — blood pressure, heart rate, temperature — begin to rise. Buprenorphine induction usually occurs in this window once the patient is in objective withdrawal (typically a Clinical Opiate Withdrawal Scale score of 12 or higher).

Hours 36–72: Peak

This is the most acute phase. Vomiting, diarrhea, muscle spasms, severe insomnia, drug cravings, anxiety, and depression are all at their worst. Vital signs require frequent monitoring. Patients in inpatient care receive IV fluids if dehydration is significant, antiemetics for vomiting, anti-diarrheal medication, sleep aids, and continued buprenorphine to control symptoms. This is the phase that drives most at-home detox attempts to fail — symptoms become unbearable and the patient returns to use to relieve them.

Days 4–7: Stabilization

Acute symptoms begin to subside. Sleep starts to improve, GI symptoms resolve, and vital signs normalize. Mood remains low, energy is poor, and cravings are still present but less intense. The patient is now medically stable enough to begin participating in the therapeutic programming of inpatient rehab — individual therapy, group sessions, education, and discharge planning.

Days 7–14 and Beyond: Post-Acute Withdrawal

Most patients move out of acute detox within 5–10 days, but a phase clinicians call post-acute withdrawal syndrome (PAWS) can continue for weeks. PAWS includes intermittent insomnia, low mood, anhedonia (difficulty experiencing pleasure), brain fog, and unpredictable cravings. PAWS is one of the strongest arguments for residential treatment that lasts 60 to 90 days — the patient remains in a structured environment while the brain continues to heal.

Medications Used in Opiate Detox

Buprenorphine (Subutex, Suboxone)

Buprenorphine is the most common medication used in modern opiate detox. It is a partial opioid agonist that binds to the same receptors as heroin and prescription opioids but produces a much weaker effect, suppressing withdrawal symptoms and cravings without producing significant euphoria. In an inpatient setting, induction begins once the patient is in objective withdrawal, the dose is titrated up over 24–48 hours, and the patient is gradually tapered down over the course of detox — or transitioned onto maintenance buprenorphine as part of a longer-term medication-assisted treatment plan.

Methadone

Methadone is a full opioid agonist used in some hospital-based detox programs and federally licensed opioid treatment programs. It is highly effective at suppressing withdrawal but is more tightly regulated than buprenorphine and is generally used in inpatient settings only when buprenorphine is contraindicated or when the patient is being stabilized for longer-term methadone maintenance.

Lofexidine and Clonidine

These are non-opioid medications that reduce the autonomic symptoms of withdrawal — high blood pressure, sweating, anxiety, GI symptoms — by acting on the brain's noradrenergic system. They are sometimes used as alternatives to buprenorphine, or in addition to it, particularly when the patient cannot or will not take an opioid agonist.

Comfort Medications

A range of supportive medications help patients tolerate detox: antiemetics for nausea, loperamide for diarrhea, NSAIDs for muscle pain, sleep aids, and short courses of anxiety medication. None of these treat the underlying opioid dependence — they make the acute phase tolerable so the patient can complete detox and move into residential treatment.

Why Medical Supervision Matters for Opiate Detox

Inpatient supervision matters for three clinical reasons:

1. Symptom severity. Acute opioid withdrawal is intensely uncomfortable. Most at-home detox attempts fail within 24–48 hours because the patient returns to use to relieve symptoms. Medical detox controls symptoms with buprenorphine and supportive care, which dramatically increases the percentage of patients who complete detox.
2. Dehydration and cardiac strain. Severe vomiting and diarrhea cause fluid and electrolyte loss. In patients with cardiac conditions, pregnancy, or polysubstance dependence, the strain can become dangerous without medical management.
3. Overdose protection after detox. Tolerance drops sharply within days of stopping. A relapse at the patient's previous dose — especially with fentanyl in the drug supply — frequently causes fatal overdose. Inpatient detox bridges directly into residential rehab, so the patient never returns to the environment where relapse and overdose occur most often.

What Happens After Opiate Detox?

After detox, the patient transitions seamlessly into the residential treatment phase of their stay. They begin participating in individual therapy, group sessions, psychiatric care, and skills-based programming. Most patients also start medication-assisted treatment with buprenorphine or extended-release naltrexone during this phase. Discharge planning begins within the first week of treatment and intensifies as the stay nears completion. Learn about inpatient MAT →