Drug & Alcohol Withdrawal Symptoms

The short version: withdrawal symptoms are your body’s reaction to losing a substance it has adapted to. What they feel like, and how dangerous they are, depends heavily on the substance. Alcohol and benzodiazepine withdrawal can be life-threatening and should be medically supervised. Opioid withdrawal is rarely fatal but intensely uncomfortable. Stimulant, nicotine, and cannabis withdrawal are mostly emotional. Here’s the at-a-glance picture, then the detail.

Substance	Symptoms often begin	Common symptoms	Can it be dangerous?
Alcohol	6–24 hours	Shaking, sweating, anxiety, nausea; seizures & DTs in severe cases	Yes, can be life-threatening. Medical detox advised.
Opioids (heroin, fentanyl, painkillers)	8–24 hours	Flu-like aches, chills, cramps, vomiting, diarrhea, intense cravings	Rarely fatal itself, but high overdose risk after. Supervision advised.
Benzodiazepines (Xanax, Ativan, Klonopin)	1–4 days	Rebound anxiety, insomnia, tremors; seizures in severe cases	Yes, can be life-threatening. Never stop cold turkey.
Stimulants (cocaine, meth, Adderall)	Hours to 1 day	The “crash”: exhaustion, heavy sleep, low mood, big appetite, cravings	Physically milder, but depression is a real risk.
Nicotine	Within hours	Irritability, anxiety, restlessness, trouble focusing, increased appetite	Not dangerous, but cravings are strong.
Cannabis	1–2 days	Irritability, anxiety, sleep trouble, vivid dreams, low appetite	Not dangerous; symptoms are uncomfortable but mild.

General guidance, not a substitute for a clinical assessment. Your experience depends on your history, dose, and health.

Why Withdrawal Happens (and How It Differs From "Detox")

When you use a substance regularly, your brain adapts to its presence and recalibrates its own chemistry to compensate. Remove the substance, and that balance collapses. Your system has to scramble to find equilibrium without it, and that scramble is withdrawal: the racing heart, the nausea, the anxiety, the cravings. Understanding that it’s a physical adjustment, not a character flaw, is the first step toward getting through it safely.

One quick clarification, because the words get used interchangeably: withdrawal is what your body goes through when a substance leaves it. Detox (detoxification) is the supervised process of managing that withdrawal safely, with monitoring and medication. You can go through withdrawal without detox, but for some substances, doing it alone is exactly what makes it dangerous.

Alcohol Withdrawal

Alcohol is one of the substances where withdrawal can become genuinely dangerous, which surprises many people, because alcohol is legal and everywhere. Mild symptoms can start within hours of the last drink: anxiety, shakiness, sweating, trouble sleeping, nausea. For someone with a long history of heavy drinking, symptoms can escalate over the next day or two into seizures and delirium tremens (DTs): confusion, hallucinations, a racing heart, and dangerously high blood pressure.

DTs are a medical emergency and can be fatal without treatment. This is exactly why alcohol detox shouldn’t be attempted alone at home if you’ve been drinking heavily. In a medically supervised detox, clinicians monitor your vital signs and use medications (often benzodiazepines such as lorazepam or chlordiazepoxide) to prevent the dangerous end of that spectrum and keep you comfortable through the rest.

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Opioid Withdrawal

Heroin, fentanyl, and prescription painkillers

Opioid withdrawal is rarely life-threatening on its own, but anyone who’s been through it will tell you it’s brutal. It often feels like a severe flu turned all the way up: deep muscle and bone aches, alternating sweating and chills, runny nose, stomach cramps, nausea, vomiting, diarrhea, and a restlessness that’s hard to put into words. Cravings in this window are intense.

The most serious danger with opioids comes after the worst of withdrawal passes. Once your tolerance drops, going back to a dose that used to feel normal can cause a fatal overdose, a risk dramatically heightened by fentanyl in today’s drug supply. Medication-assisted treatment (MAT), using medications like buprenorphine or methadone to ease withdrawal and stabilize the brain (along with comfort medications like clonidine), has transformed what this process can look like.

Benzodiazepine Withdrawal

Benzodiazepines (Xanax, Ativan, Klonopin, Valium) act on the same calming GABA system in the brain that alcohol does, and they carry the same hidden danger. Stopping suddenly can trigger rebound anxiety, insomnia, tremors, and, in serious cases, seizures. Because some benzodiazepines clear the body slowly, symptoms can show up days after the last dose and linger longer than people expect.

This is not a withdrawal to attempt cold turkey. The safe approach is a gradual, doctor-supervised taper that steps the dose down over time. If you’re trying to understand the medication itself, our article on the side effects of lorazepam explains how one widely prescribed benzodiazepine affects the body, and our benzodiazepine addiction program can help you stop safely.

Stimulant, Nicotine, and Cannabis Withdrawal

Stimulant withdrawal, from cocaine, methamphetamine, or Adderall, looks different from the others. The physical symptoms are usually milder, but the psychological “crash” can be heavy: profound exhaustion, sleeping for long stretches, a surge in appetite, vivid or unpleasant dreams, and a flat, joyless mood that can last days. The most important risk here is emotional. Depression and suicidal thoughts can surface during this period, and they deserve to be taken seriously and supported, not waited out alone.

Nicotine

Nicotine withdrawal isn’t dangerous, but it’s a big part of why quitting feels so hard. Within hours of the last cigarette or vape, people often notice irritability, anxiety, restlessness, trouble concentrating, increased appetite, and strong cravings. Symptoms usually peak in the first few days and ease over a couple of weeks.

Cannabis

Cannabis withdrawal is milder than many people expect, but it’s real, especially after heavy, regular use. It can include irritability, anxiety, sleep trouble and vivid dreams, reduced appetite, and restlessness, typically beginning a day or two after stopping and fading within one to two weeks.

If a low mood during withdrawal is part of the picture, our depression and anxiety treatment can help. For substance-specific detail, see our pieces on cocaine withdrawal symptoms and Adderall withdrawal symptoms.

When Withdrawal Is an Emergency, and Why Some Symptoms Linger

Know the red flags, and what to expect after the acute phase

Call 911 right away if you or someone with you has a seizure, severe confusion or hallucinations, chest pain, a very high fever, or thoughts of self-harm. These are most associated with alcohol and benzodiazepine withdrawal, and they are reasons to get help immediately, not to wait it out.

Most acute withdrawal eases within days to a couple of weeks. But many people notice a longer tail: weeks or months of on-and-off sleep problems, mood swings, low motivation, or fog. This is called post-acute withdrawal syndrome (PAWS), and it’s a normal part of the brain healing and rebalancing. Knowing PAWS is coming, and that it fades, helps people ride it out instead of mistaking it for failure.

When to Get Help - Who's Most at Risk, and Why Supervision Matters

Please don’t talk yourself into “it’s probably fine.” Some people are at higher risk of severe, dangerous withdrawal and should not detox alone. You’re more likely to need medical supervision if you:

Have been drinking heavily, or using benzodiazepines, regularly (seizure and DT risk)
Have a history of withdrawal seizures or delirium tremens
Use more than one substance at a time
Have a heart condition, liver problems, are older, or are pregnant
Have tried to stop before and the symptoms drove you back
Are having any thoughts of harming yourself

Medically supervised detox isn’t about weakness or needing something you “should” be able to handle alone. It’s about safety and dignity. Depending on the substance, the team may use benzodiazepines for alcohol, buprenorphine or methadone for opioids, a gradual taper for benzodiazepines, and comfort medications to manage symptoms along the way. With clinical monitoring, withdrawal becomes something you move through, not something that defeats you or risks your life.

Frequently Asked Questions

What are the most common withdrawal symptoms?
Across substances, the most common are anxiety, trouble sleeping, nausea, sweating, irritability, and cravings. The specific mix, and the danger level, depends on what you’ve been using.

Which withdrawals are dangerous?
Alcohol and benzodiazepine withdrawal can be life-threatening because they can cause seizures. These should always be done under medical supervision rather than alone.

Is withdrawal the same as detox?
Not quite. Withdrawal is what your body goes through when it loses a substance. Detox is the supervised process of managing that withdrawal safely. You can withdraw without detox, but for alcohol and benzodiazepines especially, medical detox is far safer.

Can I quit cold turkey?
For some substances, quitting abruptly is uncomfortable but survivable. For alcohol and benzodiazepines, cold turkey can be dangerous because of the seizure risk. When in doubt, talk to a clinician before stopping.

Can I detox at home?
For some substances and mild cases it may be possible, but it’s risky to judge that on your own. A brief call with a clinical team can tell you whether home detox is safe for your situation, or whether supervised care is the wiser path.

How long do withdrawal symptoms last?
Acute symptoms usually ease within several days to two weeks, though some people experience lingering effects (PAWS) for longer. Timelines vary by substance and personal history.

You Don't Have to Do This Alone

If you’re worried about someone you love

If you’re watching someone disappear into addiction, you already know how exhausting hope can feel. You can’t force another person through withdrawal, but you can make the next step easier: learn the warning signs that need emergency care (above), gently discourage them from quitting alcohol or benzodiazepines cold turkey, and have a plan ready for the moment they’re willing to accept help. Our team is glad to talk you through the options too. The free, confidential SAMHSA National Helpline (1-800-662-4357) is also available 24/7.

And if it’s you

Withdrawal is real, and it’s hard, but it’s also temporary, and it’s the doorway, not the destination. Thousands of people have walked into detox feeling exactly the fear you might be feeling right now, and walked out the other side with their footing back. If you’re in Massachusetts and trying to decide what to do next, our team can talk you through what detox would look like for your situation, with no pressure and no judgment. Verify your insurance in a few minutes, or call us at 855 732 4842 and simply ask your questions.

This page is for educational purposes and isn’t a substitute for medical advice. In a medical emergency call 911; for mental-health crisis support, call or text 988.

Contact Rockland Recovery Treatment Centers

At Rockland Recovery, we’re committed to providing compassionate and effective addiction treatment services. We understand that reaching out for help is a significant step, and our team is here to guide you through every stage of your journey toward recovery.