Substance guides

Opioid withdrawal symptoms: A complete timeline

Published February 23, 2026 · 9 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals. Editorial process.

Opioid withdrawal is one of the most physically miserable experiences a person can go through. While it is rarely life-threatening (unlike alcohol or benzodiazepine withdrawal), the intensity drives most people back to use before it resolves. Understanding the timeline — and knowing that medical detox can dramatically reduce the suffering — helps you make it through.

Hours 6-12: Early withdrawal

Symptoms begin 6-12 hours after the last dose of short-acting opioids (heroin, oxycodone) or 24-48 hours after long-acting opioids (methadone) or 24-72 hours after fentanyl (due to tissue accumulation). Early symptoms include anxiety and restlessness, muscle aches beginning, excessive yawning, runny nose and watery eyes, sweating, and difficulty sleeping.

Hours 12-36: Intensification

Symptoms ramp up significantly. Severe muscle and joint pain, abdominal cramping and diarrhea, nausea and vomiting, goosebumps and chills (the origin of "cold turkey"), dilated pupils, rapid heartbeat, and elevated blood pressure.

Hours 36-72: Peak symptoms

This is the worst period. All symptoms are at maximum intensity. Restless leg syndrome makes it impossible to find a comfortable position. Insomnia despite exhaustion. Dehydration from vomiting and diarrhea is the most significant medical risk. The subjective experience is often described as the worst flu of your life combined with severe anxiety and every nerve in your body screaming.

Days 4-7: Gradual improvement

Physical symptoms begin subsiding. Diarrhea and nausea decrease. Appetite slowly returns. Energy remains very low. Sleep is still disrupted. Psychological symptoms — anxiety, irritability, depression, and cravings — may intensify as physical symptoms fade.

Weeks 2-4+: Post-acute withdrawal

Most acute physical symptoms resolve, but PAWS (post-acute withdrawal syndrome) can persist for months. Symptoms include insomnia, anxiety, depression, difficulty concentrating, fatigue, and intermittent cravings. Read our complete PAWS guide.

How medical detox changes this

Buprenorphine (Suboxone) eliminates most withdrawal symptoms within 30-60 minutes of the first dose. Methadone provides similar relief. Comfort medications manage nausea, diarrhea, pain, and insomnia. Medical monitoring prevents dehydration complications. The difference between medicated and unmedicated opioid withdrawal is the difference between a managed medical process and a traumatic ordeal.

Find a location near you

Shelby County Treatment Center

Alabaster, AL

Call 205-216-0200

RMC Health System

Anniston, AL

Call 256-235-5745

Journey Detox and Recovery LLC

Ashland, AL

Call 256-354-1121

BHG Bessemer Treatment Center

Bessemer, AL

Call 205-425-1200

Browse all facilities →

Authoritative sources

This article references guidelines from: NIDA · SAMHSA · CDC · FDA · ASAM

Frequently asked questions

How long does opioid withdrawal last?

Acute physical symptoms last 5-7 days, peaking at 36-72 hours. Post-acute symptoms (PAWS) can persist for weeks to months. Medical detox significantly reduces the severity and duration.

Can opioid withdrawal kill you?

Opioid withdrawal is rarely directly fatal, but severe dehydration from vomiting and diarrhea can be dangerous, especially in people with underlying health conditions. The greater risk is relapse and overdose after lowered tolerance.

What is the best medication for opioid withdrawal?

Buprenorphine (Suboxone) is the most effective medication for managing opioid withdrawal, eliminating most symptoms within 30-60 minutes. Methadone and clonidine are alternatives.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.