Opioid Withdrawal: Symptoms, Timeline & Safety

Opioid withdrawal has a fearsome reputation, and I want to give you the honest picture. The good news: unlike alcohol withdrawal, coming off opioids is rarely directly fatal. The harder truth: it's genuinely tough, and it carries a hidden danger that catches people out and kills them. So this isn't something to grit your teeth through alone — it's a medical process, and it should be managed with a doctor.

What opioid withdrawal feels like

Take opioids regularly and your body comes to rely on them. Take them away and your system has to readjust — that readjustment is withdrawal. Most people describe it as a severe dose of flu crossed with deep restlessness and anxiety. Common symptoms include:

• Early: agitation and anxiety, aching muscles, watering eyes, runny nose, sweating, yawning, trouble sleeping.
• Peak: stomach cramps, nausea, vomiting and diarrhoea, goosebumps, racing heart, dilated pupils, powerful cravings.
• Throughout: a flat, low mood and the bone-deep restlessness that makes it so hard to sit still.

It's miserable, and I won't pretend otherwise. But it's survivable, temporary, and far more bearable with medical support to take the edge off.

A rough timeline

Timing depends on the opioid — shorter-acting drugs like heroin or immediate-release codeine come on fast and pass sooner; longer-acting ones start later and drag out. As a general shape:

• 8–24 hours: first symptoms appear for shorter-acting opioids — anxiety, aches, sweating, cravings, runny nose.
• 24–72 hours: the peak — cramps, nausea, sickness and restlessness at their worst. It feels relentless, but this is the summit.
• 3–7 days: the acute physical symptoms ease for most, though sleep, energy and mood take longer.
• Weeks to months: a longer tail of low mood, poor sleep, low motivation and on-and-off cravings — often called post-acute withdrawal. This is where the real relapse risk lives, and where ongoing support matters most.

The danger nobody warns you about: overdose after a break

This is the most important section on the page. The biggest risk isn't the withdrawal itself — it's relapse afterwards. Once you've been through withdrawal, your tolerance drops sharply. The dose you took comfortably before is now far more than your body can handle. People come through a few days clean, have a wobble, go back to their old amount — and that old "normal" dose stops their breathing.

I cannot say this plainly enough: returning to your previous dose after any break can kill you. That's how a huge number of overdose deaths happen — not in lifelong users, but in people who'd stopped for a bit. If you relapse, start much lower and never use alone. The risk is higher still when opioids are mixed with alcohol or benzodiazepines. It's the very same tolerance-drop trap that kills people coming back to other drugs, which I explain in my guide to cocaine overdose.

Why you shouldn't do this alone

Because opioid withdrawal is rarely directly fatal, people assume they should white-knuckle it. I'd push back hard. A GP-supervised taper — reducing the dose gradually rather than stopping dead — makes it far gentler and more likely to stick. Your doctor can also use medication to ease symptoms, or a substitute for stronger dependence. It's the safe way, and it dramatically lowers the relapse-and-overdose risk of crashing off cold.

If heroin or other strong opioids are involved, or the doses are high, go straight to specialist drug services — the helplines above can connect you. They do this every day, it's confidential, and it works.

Getting through withdrawal safely is the gateway. Staying off is the longer work — understanding what the opioids were doing for you, not just clearing them out.

After the worst is over

Surviving the acute phase is a real achievement — but the weeks after are where many slip, because the low mood and cravings linger and the reasons for using remain. That's the psychological side, where I work one to one. Understanding your triggers and treating whatever the opioids were managing turns a hard week of detox into lasting recovery. My guides on how to come off painkillers and opioid and painkiller addiction pick up from here.

I came through my own addiction, so I'm not speaking from a textbook. Withdrawal is hard, but it ends — and on the other side there's a life worth the discomfort of getting there. You don't have to face it alone.

Gary Clinton

Ireland's addiction specialist — CBT-qualified therapist, bestselling author of Never Give Up, and an ex-addict himself. Private one-to-one help for professionals, online and worldwide.