Acute opioid withdrawal typically lasts 5 to 10 days, though the exact timeline depends on which opioid you were taking, how long you used it, and the dose. Short-acting opioids like heroin and hydrocodone produce a faster, more intense withdrawal that peaks around days two and three. Long-acting opioids like methadone cause a slower, more drawn-out process. Beyond the acute phase, some people experience lingering psychological symptoms for months.
Short-Acting vs. Long-Acting Opioid Timelines
The single biggest factor in your withdrawal timeline is the half-life of the opioid you were using. Short-acting opioids (heroin, oxycodone, hydrocodone, morphine) leave your system quickly, which means withdrawal hits sooner but also resolves sooner. Symptoms usually start within 6 to 12 hours of your last dose and run their course in 5 to 10 days.
Long-acting opioids like methadone and extended-release formulations behave differently. Because the drug clears your body more slowly, withdrawal may not begin until 72 to 96 hours after your last dose. The tradeoff is that symptoms tend to be less intense at their peak, but the whole process stretches out longer, sometimes two weeks or more. Buprenorphine follows a similar pattern: slower onset, lower peak severity, longer tail.
What Each Phase Feels Like
Early Phase (First 24 Hours)
The earliest symptoms are easy to mistake for a mild cold or a bad night’s sleep. You may notice a runny nose, watery eyes, frequent yawning, and trouble falling asleep. Anxiety builds during this stage, along with an intense desire to use again just to feel normal. Light sensitivity is common. These symptoms start mild but worsen steadily over the first day.
Peak Phase (Days 2 to 3)
This is the hardest stretch. The physical symptoms ramp up significantly: diarrhea, vomiting, sweating, rapid heart rate, and rising blood pressure. Many people describe it as feeling like a severe flu, alternating between chills and overheating. Sleep becomes extremely difficult. On the psychological side, drug cravings hit their strongest point, often accompanied by depression, hopelessness, and a powerful conviction that you need the drug to function. For short-acting opioids, days two and three are generally the worst. For methadone, this peak arrives later and may be less sharp but more prolonged.
Late Phase (Days 4 to 10)
Physical symptoms gradually wind down during this window. For most people, the worst physical discomfort disappears within a week of their last dose. Cravings don’t vanish, but their intensity drops considerably. Energy levels slowly return, sleep improves, and appetite comes back. By day 10, the acute withdrawal is typically over, though you may still feel slightly off for another week or so, with residual fatigue, mild mood swings, or occasional poor sleep.
Why the Brain Takes Longer to Recover
Opioids work by binding to specific receptors in the brain that regulate pain, mood, and reward. With repeated use, these receptors adapt. They become less responsive to normal stimulation, which is why tolerance develops and why you need higher doses over time to get the same effect. When you stop taking the drug, those adapted receptors can’t immediately return to their original sensitivity. Research published in the Journal of Neuroscience found that chronic morphine exposure significantly impairs how quickly these receptors recover their normal function, meaning the brain’s reward and mood systems stay disrupted well beyond the point when the drug has left your body.
This is why withdrawal isn’t just about the drug clearing your system. The acute physical symptoms resolve once the drug is gone, but the underlying neurological recalibration takes much longer. It explains both the lingering low mood many people report in the weeks after quitting and the extended vulnerability to cravings.
Post-Acute Withdrawal Syndrome
Some people experience a second, longer phase of withdrawal known as post-acute withdrawal syndrome, or PAWS. Unlike acute withdrawal, PAWS is primarily psychological and mood-related rather than physical. Common symptoms include anxiety, irritability, trouble concentrating, emotional flatness, sleep disturbances, and waves of intense cravings that seem to come out of nowhere.
PAWS can last months to years after the acute phase ends. Symptoms tend to fluctuate rather than follow a steady decline. You might feel fine for a week, then hit a rough patch for several days before leveling out again. This unpredictability catches many people off guard, especially those who expected withdrawal to be a one-and-done experience. The good news is that each wave tends to be less severe and shorter than the last, and the gaps between episodes grow longer over time.
Factors That Affect Your Timeline
No two people experience withdrawal on exactly the same schedule. Several variables push the timeline shorter or longer:
- Which opioid you used. Short-acting drugs like heroin produce a compressed, intense withdrawal of 5 to 10 days. Methadone and other long-acting opioids create a more gradual process that can stretch past two weeks.
- How long you used. Someone who took opioids for a few weeks will generally have a milder, shorter withdrawal than someone who used daily for years. Longer use gives the brain more time to adapt, which means more time to readapt once you stop.
- Your dose. Higher doses create deeper neurological adaptation. Tapering down before stopping can reduce the severity and sometimes shorten the acute phase.
- Your metabolism. People who metabolize drugs quickly may enter withdrawal sooner but also move through it faster. Age, liver function, and overall health all play a role here.
- Whether you quit abruptly or tapered. Stopping cold turkey produces the most intense withdrawal. A gradual taper, especially under medical supervision, spreads the adjustment over a longer period with lower peak severity.
What to Realistically Expect
If you’re coming off short-acting opioids, plan for about a week of significant discomfort, with the worst concentrated in days two and three. If you’re coming off methadone or another long-acting opioid, expect a slower buildup and a longer tail, potentially two to three weeks of noticeable symptoms. In both cases, the physical symptoms are finite. They end.
The psychological recovery takes longer and is harder to put a firm number on. Most people notice meaningful improvement in mood and cravings within the first one to three months. For some, particularly those with years of heavy use, subtler symptoms like sleep difficulties, low motivation, or emotional sensitivity can linger for six months or more. These aren’t signs that something is wrong. They’re signs that your brain is still recalibrating, and each month tends to bring measurable improvement even when the day-to-day changes feel slow.