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[ Home ](https://mdster.com) 2. [ Blog ](https://mdster.com/blog) 3. [ Medical Education ](https://mdster.com/blog?category=medical-education) 4. Opioid Intoxication and Withdrawal: Naloxone, MOUD, and Linkage [ Medical Education ](https://mdster.com/blog?category=medical-education) Opioid Intoxication and Withdrawal: Naloxone, MOUD, and Linkage ================================================================= A high-yield Internal Medicine guide to bedside recognition, naloxone use, withdrawal management, and getting patients onto treatment before discharge. [ MDster Editorial Team ](https://mdster.com/about) · Mar 15, 2026 · 6 min read · 84 [ Reviewed by Dr. Ali Ragab, MBBCH, MSc, MCAI ](https://mdster.com/medical-reviewers/dr-ali-ragab) [Editorial Policy](https://mdster.com/editorial-policy) | [Corrections Policy](https://mdster.com/corrections) [ Board Review ](https://mdster.com/blog?tag=board-review) [ Internal Medicine ](https://mdster.com/blog?tag=internal-medicine) [ Toxicology ](https://mdster.com/blog?tag=toxicology) [ Addiction Medicine ](https://mdster.com/blog?tag=addiction-medicine) [ Opioid Use Disorder ](https://mdster.com/blog?tag=opioid-use-disorder) Share this article Share this post The dangerous miss is not just failing to recognize opioid use disorder. It is reversing an overdose, watching the patient wake up, and sending them back out untreated. In Internal Medicine, **opioid intoxication kills through respiratory depression**, while withdrawal creates the exact moment when patients may finally accept help. Treat both syndromes as one continuum, and every encounter becomes overdose prevention. [\[1\]](#cite-1 "Reference [1]") Recognize the Syndrome Fast --------------------------- At the bedside, start with one question: is this a **breathing problem** or a **misery problem**? Use this board-style split. [\[2\]](#cite-2 "Reference [2]") SyndromeHigh-yield cluesImmediate move**Opioid intoxication**Somnolence, reduced respiratory rate or shallow breathing, constricted pupils, possible bradycardia or hypotensionSupport airway and breathing, give naloxone, monitor for recurrent toxicity**Opioid withdrawal**Anxiety, yawning, rhinorrhea, mydriasis, sweating, piloerection, abdominal cramps, diarrhea, insomnia, tachycardiaAssess severity, start **MOUD** when appropriate, add symptomatic medications That contrast is classic board material: intoxication depresses breathing; withdrawal activates the autonomic and GI systems. In practice, if the patient is obtunded and breathing slowly, treat presumed opioid overdose even when the story is messy or polysubstance use is likely. [\[2\]](#cite-2 "Reference [2]") Naloxone: Treat the Ventilation Problem --------------------------------------- Naloxone is a rescue drug for suspected **opioid-induced respiratory depression**, not a diagnostic purity test. Give it promptly, activate emergency response, and support breathing with oxygen and rescue breaths if needed. If there is no response, repeat after **2 to 3 minutes**. Naloxone is safe even if you are wrong about opioids, but lack of response should widen the differential and push you toward a broader tox and medical evaluation while ventilation remains the priority. [\[3\]](#cite-3 "Reference [3]") > **Clinical Pearl:** In opioid overdose, the naloxone endpoint is **adequate spontaneous breathing**, not full wakefulness. Do not keep escalating doses just to make the patient sit up and talk. [\[1\]](#cite-1 "Reference [1]") After reversal, do not declare victory too early. Naloxone wears off before many opioids; monitor for recurrent toxicity for **at least 4 hours after the last dose**, and longer when methadone or other long-acting opioids are involved. Expect naloxone-precipitated withdrawal in opioid-dependent patients. It is miserable, but usually not life-threatening, and it should trigger a treatment conversation rather than discharge inertia. [\[3\]](#cite-3 "Reference [3]") Withdrawal Management: Relief Is Not the Same as Treatment ---------------------------------------------------------- Opioid withdrawal is the opposite toxidrome: dilated pupils, yawning, sweating, piloerection, abdominal cramps, diarrhea, vomiting, restlessness, and insomnia. The exam pearl is simple: withdrawal looks dramatic but usually does **not** kill, unlike opioid intoxication, unless complications such as severe dehydration or another medical illness are driving the instability. [\[2\]](#cite-2 "Reference [2]") Do not mistake withdrawal management for treatment of OUD. **TIP 63** is clear that short-term medically supervised withdrawal alone is rarely effective and should not stand alone because return to opioid use is common after tolerance falls. Use symptomatic medications—**clonidine** for autonomic symptoms, **ondansetron** for nausea, **loperamide** for diarrhea, **NSAIDs** for pain, and sleep support—as adjuncts while you move the patient toward medication treatment. [\[4\]](#cite-4 "Reference [4]") Medication-Assisted Treatment Linkage: Own the Handoff ------------------------------------------------------ This is where medication-assisted treatment linkage actually matters. **Buprenorphine** should be started when there is objective withdrawal. SAMHSA’s Quick Start Guide advises waiting until the patient is in withdrawal, often about **12 hours after short-acting opioids** and **48 to 72 hours after methadone**; fentanyl exposure may require a longer wait, a higher **COWS** threshold, and a lower initial dose to reduce precipitated withdrawal risk. Since **December 2022**, the federal X-waiver has been eliminated; as of **March 2026**, any clinician with DEA Schedule III authority may prescribe buprenorphine for OUD where state law allows. [\[5\]](#cite-5 "Reference [5]") Buprenorphine is not the only evidence-based option. **Methadone** remains highly effective, but for OUD it is dispensed through a **SAMHSA-certified opioid treatment program**. That makes discharge planning operational, not aspirational: leave the hospital or ED with naloxone, a named follow-up clinician or OTP, and a warm handoff. TIP 63 also warns against forcing hospitalized patients to withdraw from opioid agonist treatment and emphasizes postdischarge coordination with outpatient providers. [\[6\]](#cite-6 "Reference [6]") Clinical Correlations --------------------- In real IM practice, opioid syndromes rarely come alone. Look for coexisting trauma, psychiatric illness, liver disease, cardiovascular disease, and complications of injection drug use such as **hepatitis B or C, HIV, TB, infective endocarditis, septic arthritis, osteomyelitis, abscesses, and cellulitis**. The board trap is treating the toxidrome and forgetting the disease; the winning move is overdose reversal plus **MOUD** plus follow-up the patient can actually reach. [\[2\]](#cite-2 "Reference [2]") Key Takeaways ------------- - In **opioid intoxication**, respiratory depression is the emergency; pupil size is secondary. Support breathing and give naloxone early. [\[1\]](#cite-1 "Reference [1]") - The naloxone endpoint is **adequate spontaneous breathing**, not full arousal. Repeat doses every 2 to 3 minutes if needed and monitor for recurrent toxicity. [\[1\]](#cite-1 "Reference [1]") - **Opioid withdrawal** causes autonomic and GI distress and usually is not fatal, but detox alone is poor care. [\[2\]](#cite-2 "Reference [2]") - Start or arrange **MOUD** from the hospital or ED when possible. Buprenorphine requires objective withdrawal; methadone linkage requires an OTP. [\[5\]](#cite-5 "Reference [5]") - Send patients home with **naloxone and a real follow-up plan**, not just discharge instructions. [\[4\]](#cite-4 "Reference [4]") Conclusion ---------- If you remember one thing, remember this: opioid withdrawal is not a nuisance problem after the real emergency. It is the doorway to preventing the next intoxication. Reverse the overdose, treat the withdrawal, start medication, and own the handoff. [\[1\]](#cite-1 "Reference [1]") References (13) ------------------- 1. 1. [ library.samhsa.gov/sites/default/files/information-for-prescribers.pdf ](https://library.samhsa.gov/sites/default/files/information-for-prescribers.pdf) [↩](#cite-ref-1-1 "Back to text") 2. 2. [ downloads.asam.org/sitefinity-production-blobs/docs/default-source/guidelines/npg-jam-supplement.pdf ](https://downloads.asam.org/sitefinity-production-blobs/docs/default-source/guidelines/npg-jam-supplement.pdf) [↩](#cite-ref-2-1 "Back to text") 3. 3. [ www.cdc.gov/overdose-prevention/media/pdfs/2024/04/SAMHSA-overdose-prevention-response-toolkit.pdf ](https://www.cdc.gov/overdose-prevention/media/pdfs/2024/04/SAMHSA-overdose-prevention-response-toolkit.pdf) [↩](#cite-ref-3-1 "Back to text") 4. 4. [ library.samhsa.gov/sites/default/files/pep21-02-01-002.pdf ](https://library.samhsa.gov/sites/default/files/pep21-02-01-002.pdf) [↩](#cite-ref-4-1 "Back to text") 5. 5. [ www.samhsa.gov/sites/default/files/quick-start-guide.pdf ](https://www.samhsa.gov/sites/default/files/quick-start-guide.pdf) [↩](#cite-ref-5-1 "Back to text") 6. 6. [ www.samhsa.gov/substance-use/treatment/options/methadone ](https://www.samhsa.gov/substance-use/treatment/options/methadone) [↩](#cite-ref-6-1 "Back to text") 7. 7. Substance Abuse and Mental Health Services Administration. TIP 63: Medications for Opioid Use Disorder. 2021 update. https://library.samhsa.gov/sites/default/files/pep21-02-01-002.pdf 8. 8. Substance Abuse and Mental Health Services Administration. Buprenorphine Quick Start Guide. https://www.samhsa.gov/sites/default/files/quick-start-guide.pdf 9. 9. Substance Abuse and Mental Health Services Administration. Information for Prescribers. https://library.samhsa.gov/sites/default/files/information-for-prescribers.pdf 10. 10. American Society of Addiction Medicine. The ASAM National Practice Guideline for the Treatment of Opioid Use Disorder. https://downloads.asam.org/sitefinity-production-blobs/docs/default-source/guidelines/npg-jam-supplement.pdf 11. 11. Centers for Disease Control and Prevention. 5 Things to Know About Naloxone. https://www.cdc.gov/overdose-prevention/reversing-overdose/about-naloxone.html 12. 12. Substance Abuse and Mental Health Services Administration. Methadone. https://www.samhsa.gov/substance-use/treatment/options/methadone 13. 13. Substance Abuse and Mental Health Services Administration. Pharmacist Verification of Buprenorphine Providers. https://www.samhsa.gov/substance-use/treatment/find-treatment/pharmacist-verification Next Turn reading into Internal Medicine performance ------------------------------------------------- - System‑based, exam‑style questions + explanations - Smarter review to reinforce weak topics - Build confidence with measurable progress [ Start practicing ](https://mdster.com/user/dashboard) [ Internal Medicine ](https://mdster.com/speciality/internal-medicine) [ View pricing ](https://mdster.com/pricing) [ Explore features ](https://mdster.com/features) No credit card required. Full access to all features. No commitment. Cancel anytime. 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