72 Hours: When to Start Buprenorphine in Prescription Opioid Withdrawal

Most people stop feeling the worst prescription opioid withdrawal symptoms within 7 to 10 days. Short-acting opioids like oxycodone or hydrocodone typically start causing symptoms within 6 to 12 hours and peak around 48 to 72 hours, while long-acting formulations begin and peak later and can linger for weeks. Seek medical care if you’re vomiting repeatedly, mixing substances, or noticing signs of dehydration.

TL;DR:

• Withdrawal symptoms from short-acting opioids like oxycodone typically start within 6 to 12 hours and peak around days 2 to 3, resolving in about a week.
• Long-acting opioids such as methadone or fentanyl delay onset to up to 72 hours and can extend recovery symptoms into several weeks depending on usage history.
• Severe dehydration, confusion, chest pain, and simultaneous alcohol or benzodiazepine withdrawal require immediate medical evaluation to prevent life-threatening complications.
• Proper timing and supervision are essential for medications like buprenorphine to avoid precipitated withdrawal, with clinicians using the COWS scale to guide treatment.
• Medically supervised detox provides closer monitoring, symptom management, and transition planning, especially during the first 72 hours when withdrawal symptoms are hardest to manage.

Table of Contents

• How the withdrawal timeline unfolds hour by hour
• What symptoms show up at each stage
• When medications start and what each one does
• Staying safe while your body clears the opioid
• How clinicians track progress and what supervised detox adds
• What clinicians want you to understand about this process
• Getting through withdrawal with medical support
• Sources
• FAQ

How the withdrawal timeline unfolds hour by hour

The shape of your withdrawal depends heavily on what you were taking and for how long. Short-acting opioids such as oxycodone, hydrocodone, and immediate-release morphine tend to follow a faster, steeper curve than extended-release products or methadone.

For short-acting opioids, symptoms commonly begin 8 to 12 hours after the last dose, intensify quickly, and peak between 48 and 72 hours. Most people see substantial relief by the 7 to 10 day mark. Long-acting and extended-release opioids delay everything: onset often takes 24 to 72 hours, the peak arrives later (somewhere in days 3 through 8), and lingering symptoms can stretch into several weeks.

A general progression looks like this:

• Hours 6 to 12: Early anxiety, yawning, a runny nose, and restlessness begin for short-acting opioids.
• Hours 24 to 48: Symptoms broaden to sweating, muscle aches, and disrupted sleep; long-acting formulations may just be starting here.
• Days 1 to 3: Physical symptoms intensify sharply, often reaching or approaching peak severity.
• Days 4 to 7: Gastrointestinal symptoms and cravings usually remain strong but start easing for short-acting opioids.
• Weeks 2 to 4: Residual fatigue, low mood, and cravings can persist, especially after long-term or high-dose use.

Several factors stretch this timeline out. Methadone and other extended-release opioids clear the body slowly, which delays both onset and resolution. Fentanyl exposure, high doses, and years of continuous use also tend to produce a longer and rockier course, a pattern discussed further in Connected Recovery’s overview of fentanyl withdrawal. No two withdrawals look identical, but this framework gives you a realistic starting point.

What symptoms show up at each stage

Withdrawal tends to move through recognizable phases, and knowing what belongs where helps you judge whether what you’re experiencing is expected or a sign something more serious is happening.

Early symptoms resemble a bad flu: yawning, a runny nose, sweating, muscle aches, anxiety, and trouble sleeping. As withdrawal moves toward its peak, gastrointestinal symptoms take over: nausea, vomiting, diarrhea, abdominal cramping, tremor, and intense cravings. Cleveland Clinic’s overview of opioid withdrawal describes this same progression from flu-like onset to gastrointestinal peak, noting that withdrawal itself is usually not directly life-threatening, though its complications can be.

Withdrawal itself rarely kills, but dehydration and mixed-substance complications can turn a miserable week into a medical emergency, according to Cleveland Clinic. That distinction matters when you’re deciding whether to tough it out at home.

Once the acute phase passes, some people enter a post-acute period marked by sleep disturbance, low mood, irritability, and cravings that can persist for weeks. Watch for these signs that need urgent attention:

• Persistent vomiting or diarrhea that prevents you from keeping fluids down.
• Confusion, chest pain, or signs of severe dehydration such as dizziness or a rapid heartbeat.
• Any withdrawal occurring alongside alcohol or benzodiazepine use.

When medications start and what each one does

Medication timing is where withdrawal management gets technical, and getting it wrong can make things worse instead of better.

Buprenorphine is a partial opioid agonist used both to ease withdrawal and to treat opioid use disorder long term, but it has to be timed carefully. Starting it too early, before withdrawal has actually set in, can trigger precipitated withdrawal: a sudden, severe worsening of symptoms. SAMHSA’s TIP 63 guidance recommends waiting until early withdrawal is clearly present, commonly at least 6 to 12 hours after a short-acting opioid or 24 to 72 hours after a long-acting one, though clinicians judge readiness by observable symptoms rather than the clock alone.

Other medication options include:

• Methadone, used for withdrawal and maintenance, typically administered and titrated in specialized, regulated settings.
• Lofexidine, an FDA-indicated option to mitigate withdrawal symptoms during abrupt discontinuation, dosed for up to 14 days with blood pressure monitoring since it can cause hypotension, per its FDA prescribing information.
• Symptomatic medications such as antiemetics, antidiarrheals, and clonidine, which treat individual symptoms without addressing the underlying opioid dependence.

Trazodone sometimes comes up for withdrawal-related insomnia, but it is not an opioid withdrawal treatment. Its labeling warns of its own discontinuation symptoms, including anxiety and sleep disturbance, so it should never substitute for a structured withdrawal plan.

Pro Tip: Never start buprenorphine on your own timeline. Let a clinician confirm you’re in early withdrawal first to avoid precipitated symptoms.

Staying safe while your body clears the opioid

Withdrawal carries real physical risks beyond discomfort, and knowing them can prevent a bad week from becoming a dangerous one.

1. Watch for dehydration. Persistent vomiting or diarrhea can cause electrolyte problems severe enough to require IV fluids in an emergency department.
2. Treat mixed withdrawal as an emergency. Withdrawing from opioids alongside alcohol or benzodiazepines can be life-threatening and needs clinician evaluation, not a home remedy.
3. Respect your lowered tolerance. After days without opioids, your tolerance drops, which raises overdose risk if you return to a previous dose. Ask a provider about naloxone and a safe-discharge plan.
4. Get care immediately for confusion, chest pain, seizures, or an inability to keep fluids down.

How clinicians track progress and what supervised detox adds

Clinicians often use the Clinical Opiate Withdrawal Scale (COWS) to score symptoms and classify severity from mild to severe, which guides decisions like when to start buprenorphine or transfer someone to a higher level of care. A thorough assessment also covers your last dose, other substances used, pregnancy status, vital signs, and urine testing.

Medically supervised detox builds on this monitoring with:

• Round-the-clock observation and symptom-directed medications.
• Hydration support and a plan to transition into MAT or residential care.

Some treatment centers offer this kind of monitoring in small settings, pairing 24/7 medical supervision with individualized treatment plans rather than a one-size-fits-all protocol.

What clinicians want you to understand about this process

Severe discomfort during opioid withdrawal is expected, but the dangers that actually threaten your safety, dehydration, mixed-substance withdrawal, and post-abstinence overdose risk, are manageable with the right care in place. If you’re facing this alone, call a prescriber or addiction medicine provider before you stop taking anything abruptly. Families should ask about naloxone access and consider medically supervised options like Connected Recovery as a starting point.

— Jim

Getting through withdrawal with medical support

Medically supervised detox in small residential settings can provide closer monitoring and plans built around specific opioids, doses, and histories rather than generic timelines. That matters most in the first 72 hours, when symptoms are hardest to predict and medication timing decisions carry the most risk.

Services relevant to opioid withdrawal include:

• Medical Detox, with 24/7 supervision through the acute withdrawal window.
• Medication Assisted Treatment (MAT), for buprenorphine or methadone induction once early withdrawal is confirmed.
• Residential Treatment and aftercare planning for the weeks after acute symptoms resolve.

Call Connected Recovery to request an assessment and find out what a supervised detox plan would look like for you.

This article is general information, not a substitute for advice from a qualified doctor. Consult a qualified healthcare professional about your own circumstances before acting on anything here.

Sources

• ASAM National Practice Guideline (pocket guide)
• Opioid withdrawal — Cleveland Clinic
• Lofexidine tablets prescribing information — FDA

FAQ

How soon do opioid withdrawal symptoms typically start?

Short-acting opioids like oxycodone or hydrocodone usually produce symptoms within 6 to 12 hours of the last dose. Long-acting formulations delay onset to roughly 24 to 72 hours, so the timeline depends heavily on what you were taking.

Can trazodone help with opioid withdrawal symptoms?

Trazodone is not an evidence-based opioid withdrawal treatment; it is sometimes used off-label for withdrawal-related insomnia. Its own prescribing information warns of discontinuation symptoms, so it should not replace a supervised withdrawal plan.

What medications are used to treat opioid withdrawal?

Buprenorphine, methadone, and lofexidine are the main options, with buprenorphine and methadone also supporting longer-term treatment of opioid use disorder. Lofexidine treats symptoms only and requires blood pressure monitoring during its use.

What are the symptoms of hydrocodone withdrawal?

Hydrocodone withdrawal starts with flu-like symptoms such as yawning, sweating, and anxiety, then progresses to nausea, vomiting, diarrhea, and cravings at its peak, according to Cleveland Clinic. As a short-acting opioid, symptoms typically begin within 6 to 12 hours and follow the same peak and resolution pattern as other short-acting formulations.

How is opioid withdrawal severity measured?

Clinicians commonly use the Clinical Opiate Withdrawal Scale (COWS) to score symptoms and classify severity from mild to severe. The score helps guide decisions about medication timing and whether a higher level of care is needed.

Recommended

• Opioid Detox Timeline: What to Expect and When to Get Help
• Fentanyl Withdrawal Symptoms: Timeline, COWS, and Care