Acute intoxication vs Withdrawal syndromes
How to tell Acute intoxication and Withdrawal syndromes apart when a board question makes them look alike.
Intoxication is drug-on-board effect; withdrawal is rebound after stopping, often opposite the intoxication pattern.
Side by side
Acute intoxication is the direct effect of a substance: alcohol/benzodiazepines/opioids sedate; stimulants activate sympathetic tone; antimuscarinics dry and delirious.
Withdrawal is physiologic rebound after reduction or cessation: alcohol/benzodiazepine withdrawal is hyperexcitable; opioid withdrawal is flu-like GI/autonomic distress; stimulant withdrawal is crash, dysphoria, and hypersomnia.
Intoxication reflects receptor activation or blockade while the drug is present.
Withdrawal reflects adaptation to chronic exposure followed by abrupt absence, often producing opposite-direction symptoms.
Smell of alcohol, positive exposure history, miosis/respiratory depression, mydriasis/diaphoresis, or sedation shortly after use supports intoxication.
Last use hours to days ago, tremor, seizures, delirium, lacrimation, rhinorrhea, diarrhea, piloerection, mydriasis, dysphoria, or cravings support withdrawal.
The trap
Mydriasis can mean stimulant intoxication or opioid withdrawal, so route, timing, bowel symptoms, and sympathetic signs matter.
The repair move
For substance stems, ask whether symptoms began after use or after stopping, then match the receptor rebound pattern.
Try a free question
CoreA patient with opioid use stops heroin 24 hours ago and now has yawning, lacrimation, rhinorrhea, mydriasis, piloerection, abdominal cramps, and diarrhea. Which syndrome is most likely?
Show answer and explanation
Answer: A. Opioid withdrawal. After stopping opioids, lacrimation, rhinorrhea, mydriasis, piloerection, cramps, and diarrhea support opioid withdrawal.
Why the other choices are tempting
- B. Opioid intoxication causes miosis and respiratory depression.
- C. Cocaine intoxication causes sympathomimetic signs after stimulant use.
- D. Benzodiazepine intoxication causes sedation and ataxia.
- E. Alcohol intoxication causes disinhibition, ataxia, and CNS depression after use.
Flashcards
Tap a card to flip it.
What is the fastest separator between intoxication and withdrawal?
Symptoms soon after use support intoxication; symptoms after reduction or cessation support withdrawal.
What withdrawal can be life-threatening with seizures?
Alcohol and benzodiazepine withdrawal can cause seizures and delirium.
Quick answers
What is the fastest way to tell Acute intoxication from Withdrawal syndromes?
Intoxication is drug-on-board effect; withdrawal is rebound after stopping, often opposite the intoxication pattern.
What is the key clue for Acute intoxication?
Acute intoxication is the direct effect of a substance: alcohol/benzodiazepines/opioids sedate; stimulants activate sympathetic tone; antimuscarinics dry and delirious.
What is the key clue for Withdrawal syndromes?
Withdrawal is physiologic rebound after reduction or cessation: alcohol/benzodiazepine withdrawal is hyperexcitable; opioid withdrawal is flu-like GI/autonomic distress; stimulant withdrawal is crash, dysphoria, and hypersomnia.
What is the common trap with Acute intoxication vs Withdrawal syndromes?
Mydriasis can mean stimulant intoxication or opioid withdrawal, so route, timing, bowel symptoms, and sympathetic signs matter.