Opioid Withdrawal Timeline

General opioid withdrawal timing for short- and long-acting opioids, symptom peaks, and why MOUD beats white-knuckle schedules.

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Key takeaway

Opioid withdrawal often starts within hours for short-acting opioids and later for long-acting ones, with peak flu-like symptoms over several days. Timelines vary by drug, dose, and fentanyl exposure. Medications for opioid use disorder treat the disorder after acute withdrawal. Call or text (800) 653-9376 to plan MOUD.

Last updated: Wed Oct 07 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

You want a clock. Opioid withdrawal follows patterns, not guarantees. Fentanyl, heroin, oxycodone, and methadone do not share one identical curve.

Call 911 for overdose. Call or text 988 for a crisis.

Short-acting versus long-acting

Heroin and many IR pills can start withdrawal within hours. Methadone and some extended-release products start later and can last longer. Fentanyl complicates induction timing for buprenorphine.

Siblings: opioid withdrawal basics, fentanyl withdrawal symptoms, oxycodone withdrawal.

What peaks and what lingers

Aches, diarrhea, yawning, and anxiety often peak over several days. Insomnia and craving can outlast the acute flu phase. See PAWS timeline.

MOUD is the exit ramp

White-knuckle calendars do not block overdose after relapse. Methadone, buprenorphine, or extended-release naltrexone (when appropriate) belong in the plan.

Broker filter

Detox sold as a cure for opioid use disorder without MOUD access is unfinished care.

Next step

FindTreatment.gov or SAMHSA 1-800-662-HELP (4357). Call or text (800) 653-9376.

Call or text (800) 653-9376 when an opioid withdrawal timeline needs to connect to medication treatment.

Additional Resources

Sources cited on this page:

Common Questions

How long does opioid withdrawal last?

Acute symptoms often span several days. Sleep and craving can last longer. Methadone withdrawal can stretch longer than heroin or fentanyl patterns.

When do symptoms peak?

Many short-acting opioid withdrawals peak within two to three days. Individual curves differ, especially with fentanyl.

Is opioid withdrawal deadly?

Usually not by itself compared with alcohol withdrawal, but vomiting, dehydration, and relapse overdose are dangerous.

How does this relate to opioid withdrawal basics?

Basics cover symptom lists and coping. This page targets timeline search intent.

Should I use a printed day-by-day chart?

Charts are illustrative only. Clinical induction timing for buprenorphine depends on your last use and COWS scoring.