Drug Withdrawal: Symptoms, Dangers and Safe Detox

What drug withdrawal is

When you take a drug regularly, the brain and body adjust to its constant presence. This adaptation is called physical dependence. When the drug is removed, the adapted systems are left unbalanced, and you feel roughly the opposite of the drug's effect. A sedative leaves you anxious and wired. A painkiller leaves you aching. A stimulant leaves you exhausted and flat.

Dependence is not the same as addiction. Anyone who takes an antidepressant, a steroid or an opioid painkiller daily for weeks can become dependent and have withdrawal, even when taking it exactly as prescribed. Addiction (substance use disorder) adds craving, loss of control and continued use despite harm. Withdrawal can happen with or without addiction.

This page focuses on what to do when stopping a drug or medicine. For the biology and a broader overview, see withdrawal syndrome.

Which drugs are dangerous to stop suddenly

Drug withdrawal symptoms

Common physical symptoms include:

• sweating, chills and goosebumps
• shaking or tremor
• nausea, vomiting, diarrhea and stomach cramps
• headache, muscle aches and restlessness
• racing heart and raised blood pressure
• runny nose, watery eyes and yawning, especially with opioids

Common mental symptoms include anxiety, irritability, insomnia, low mood, poor concentration and strong cravings. Severe withdrawal from alcohol or sedatives can cause hallucinations, confusion and seizures.

How long drug withdrawal lasts

The timeline depends on the drug's half-life (how quickly the body clears it):

• Short-acting drugs (heroin, fentanyl, alprazolam, paroxetine, venlafaxine) cause withdrawal sooner and more intensely, but it peaks and settles faster.
• Long-acting drugs (methadone, diazepam, fluoxetine) cause later, milder but more drawn-out withdrawal.

Acute opioid withdrawal from short-acting drugs peaks around days 2 to 3 and largely settles within 7 to 10 days. Alcohol withdrawal usually resolves within a week. Benzodiazepine withdrawal can last weeks, especially after high doses. Some people have lingering sleep problems, low mood and cravings for months, known as post-acute withdrawal syndrome.

Getting help: medical detox and tapering

Tapering

For most prescribed medicines, the safest approach is a gradual taper: reducing the dose in steps over weeks or months, guided by your prescriber. Benzodiazepines are often reduced by about 5% to 25% every 2 to 4 weeks, with pauses if symptoms flare. Antidepressants may need small final steps, sometimes using liquid forms. Steroids are tapered while checking whether the adrenal glands have recovered. Do not split or change doses on your own.

Medical detox

Detox means managing withdrawal safely. It can happen:

• At home with outpatient support for mild to moderate withdrawal in someone with stable housing and support.
• In a medically supervised unit or hospital for alcohol or sedative withdrawal with past seizures or DTs, other serious illness, pregnancy, or mixed drug use.

Staff use scoring tools such as CIWA-Ar for alcohol and COWS for opioids to adjust treatment.

Medicines that help

• Alcohol and sedatives: a long-acting benzodiazepine given on a reducing schedule, plus thiamine for alcohol withdrawal.
• Opioids: buprenorphine or methadone relieve withdrawal and are the most effective long-term treatment for opioid use disorder. Lofexidine or clonidine ease sweating, cramps and anxiety. Loperamide and anti-nausea medicines help gut symptoms.
• Nicotine: patches, gum or lozenges, varenicline or bupropion.
• Stimulants and cannabis: no specific approved medicine. Treatment is supportive with sleep, food, fluids and close mental health follow-up.

Home care during mild withdrawal

• Drink plenty of fluids, especially with vomiting or diarrhea.
• Eat small, regular meals.
• Keep someone with you who knows what warning signs to watch for.
• Remove alcohol and other drugs from the home.
• Over-the-counter pain relievers such as acetaminophen (paracetamol) or ibuprofen can ease aches. Follow the label dose.

Why detox alone is not enough

Detox treats the body's dependence but not addiction. Without follow-up treatment, most people return to use. Counseling, peer support, medications for opioid or alcohol use disorder and treatment of co-existing depression or anxiety all reduce relapse. Call the SAMHSA National Helpline at 1-800-662-4357 (free, confidential, 24/7) to find treatment in the US.

Frequently asked questions

What drugs can kill you if you stop taking them suddenly?

Alcohol, benzodiazepines and barbiturates can cause fatal seizures or delirium if stopped abruptly after heavy or long-term use. Stopping long-term steroids suddenly can cause adrenal crisis. Clonidine and beta blockers can cause dangerous rebound blood pressure or heart problems. Taper these under medical guidance.

How long does drug withdrawal last?

Acute withdrawal usually lasts a few days to 2 weeks, depending on the drug. Short-acting opioids peak at 2 to 3 days. Benzodiazepine withdrawal can last weeks. Some people have milder sleep, mood and craving problems for months afterward.

Can you withdraw from prescription medicines taken as directed?

Yes. Physical dependence develops with regular use of many medicines, including antidepressants, opioid painkillers, sleeping pills, gabapentin, steroids and some blood pressure drugs. Withdrawal does not mean you are addicted. It means the dose should be reduced gradually.

Is it safe to detox at home?

It can be for nicotine, cannabis, stimulants and mild opioid withdrawal with support. Home detox from alcohol or benzodiazepines is risky if you drink heavily, have had seizures or DTs before, or use several substances. Ask a doctor to assess your risk first.

Does opioid withdrawal kill you?

Opioid withdrawal itself rarely threatens life in healthy adults, though severe vomiting and diarrhea can cause dehydration. The bigger danger is overdose afterward, because tolerance falls quickly. Buprenorphine or methadone treatment greatly lowers the risk of death.