Opioid withdrawal is rarely life-threatening, but it is genuinely miserable, and pretending otherwise doesn’t help anyone. Symptoms typically start within 6 to 12 hours of the last dose for short-acting opioids (like heroin or oxycodone) and can take up to 30 hours to begin with longer-acting ones (like methadone). Most people hit peak discomfort within the first 72 hours.
Why Withdrawal Happens
Opioids attach to receptors in the brain that regulate pain and reward. Over time, the brain adjusts its own chemistry to compensate for the drug’s presence — which is why stopping suddenly throws that balance off. The body isn’t malfunctioning during withdrawal. It’s recalibrating to the absence of something it had adapted around.
Common Physical Symptoms
Muscle aches and cramping, nausea, vomiting, diarrhea, sweating, chills that alternate with hot flashes, runny nose, watery eyes, and insomnia. Physically, it can feel a lot like a severe flu that won’t quit.
Common Psychological Symptoms
Anxiety, irritability, restlessness, low mood, and intense cravings that can spike unpredictably even after the physical symptoms start easing. The psychological piece is often what drives relapse, not the physical discomfort — cravings can persist well past the point where the body has stabilized.
Opioid Withdrawal Timeline: Hour by Hour, Day by Day
The acute phase generally runs on this pattern: symptoms begin within 6-30 hours depending on the opioid, peak around 48-72 hours, and the worst of the physical symptoms typically ease within a week to ten days. But that’s not the full picture. A second, longer phase — post-acute withdrawal syndrome — can follow. Managing this timeline safely is where medically supervised detox makes a real difference, both in comfort and in reducing relapse risk during the roughest days.
Post-Acute Withdrawal Syndrome (PAWS): The Part Nobody Warns You About
After the acute phase fades, a lot of people are left with lingering mood swings, sleep disruption, fatigue, and cravings that can stretch on for weeks or months. PAWS isn’t talked about nearly enough, and it catches people off guard — they expect to feel “done” once the physical symptoms pass, and instead find themselves still struggling in ways that are harder to explain to people who haven’t been through it.
Why You Shouldn’t Try to White-Knuckle Opioid Withdrawal Alone
Unsupervised withdrawal isn’t just uncomfortable — it’s one of the highest-risk windows for relapse, partly because tolerance drops fast during withdrawal, which makes returning to a previous dose dangerous even for someone who’s used that amount before. Medical support doesn’t just ease the physical symptoms. It reduces the chances of that relapse-and-overdose cycle that so often follows a solo detox attempt.
If you’re in withdrawal right now, or you’re supporting someone who is, you don’t have to manage this without help. Reach out to our team — we can talk through what medical support would look like for your specific situation.