Substance Withdrawal Monitoring

Withdrawal monitoring is a safety problem, not simply a symptom checklist. In opioid use disorder, repeated full-agonist exposure changes mu-opioid receptor responsiveness and reward, stress, and executive-control circuitry. When opioid exposure falls, physical dependence produces autonomic, gastrointestinal, pain, and psychological symptoms. The nurse must first determine which physiology is present: withdrawal, opioid toxicity, or precipitated withdrawal after buprenorphine. The clinical focus here is opioid withdrawal and medications for opioid use disorder (MOUD). Do not transfer these medication rules to alcohol or sedative-hypnotic withdrawal, which require separate surveillance and treatment protocols. Opioid use disorder is diagnosed clinically using DSM-5-TR criteria: at least 2 of 11 problematic-use criteria within 12 months. Tolerance and withdrawal do not count toward the diagnosis when opioids are taken as prescribed under medical supervision, and a positive urine drug screen cannot establish OUD by itself. For an RPN, the bedside work is to obtain an accurate substance-and-dose timeline, trend respiratory and withdrawal findings, administer medications safely within orders and provincial scope, recognize deterioration, and escalate without delay. The goal is not merely to complete detoxification; withdrawal management...