Heroin Overdose Treatment
Administer naloxone immediately to reverse respiratory depression in suspected heroin overdose, with initial dosing of 0.04-0.4 mg IV (titrated) or 2 mg IM/intranasal, followed by mandatory observation in a healthcare setting until vital signs normalize and risk of recurrent toxicity is low 1.
Immediate Management Algorithm
Step 1: Recognition and Initial Response
The heroin overdose syndrome consists of three key features 2:
- Abnormal mental status
- Substantially decreased respiration (respiratory rate <12/min)
- Miotic (pinpoint) pupils
Critical pitfall: Do not wait to confirm the presence or absence of a pulse before acting. Even trained responders have difficulty rapidly determining pulselessness, and respiratory arrest precedes cardiac arrest in opioid overdoses 1.
Step 2: Airway and Breathing Support
- Provide ventilatory support immediately if respirations are inadequate
- Ensure airway patency and consider positive pressure ventilation
- Do not delay ventilation while preparing naloxone - ventilatory support alone can be lifesaving 1
Step 3: Naloxone Administration
Route and Dosing Options:
Intramuscular (IM): 1.6-2 mg IM is highly effective as a single large dose 3, 4. This route requires fewer repeat doses and naloxone infusions compared to IV titration (10% vs 39% requiring infusion) 3.
Intravenous (IV): Small titrated doses (0.04-0.4 mg) repeated every 2-3 minutes until adequate response 1. This allows more controlled reversal but requires more frequent redosing.
Intranasal (IN): 2 mg concentrated intranasal naloxone (2 mg/ml) is 72-82% effective within 10 minutes, with similar response times to IM administration 4. This route eliminates needlestick injury risk.
Key consideration: Patients who have co-ingested alcohol with heroin require higher naloxone doses - they are 2.25 times more likely to need greater than standard dosing 5.
Step 4: Post-Naloxone Monitoring
Mandatory observation period 1:
- Observe in a healthcare setting until risk of recurrent opioid toxicity is low
- Monitor until level of consciousness and vital signs have normalized
- For heroin/fentanyl/morphine: abbreviated observation may be adequate
- For long-acting or sustained-release opioids: extended observation required (duration of naloxone action is shorter than many opioids)
Management of recurrent toxicity 1:
- Administer repeated small doses of naloxone, OR
- Initiate naloxone infusion (particularly beneficial after initial IM dosing)
Important Clinical Considerations
Adverse Effects Management
Naloxone precipitates opioid withdrawal but serious complications are rare 1, 3:
- Acute behavioral disturbance requiring sedation occurs in only 3% of cases 3
- Sudden-onset pulmonary edema can occur but responds readily to positive pressure ventilation 1
- The benefits of reversing life-threatening respiratory depression far outweigh withdrawal risks
Hospital Admission Criteria
Approximately 3-7% of treated patients require admission for 2:
- Pneumonia
- Noncardiogenic pulmonary edema
- Other complications
Lay Responder Training
It is reasonable to train lay rescuers in opioid overdose response and naloxone administration 1. Most overdoses occur at home in the company of others, creating an opportunity for bystander intervention. Training that includes hands-on skills practice with naloxone administration is more effective than education alone 1.
Route Selection in Practice
IM administration offers practical advantages: Single large dose (1.6-2 mg) is effective in the majority of patients, requires fewer repeat interventions, and is suitable for both prehospital and lay responder use 3.
IV titration is preferred when: Fine control of reversal is needed to avoid precipitating severe withdrawal in opioid-dependent patients, though this comes at the cost of more frequent redosing requirements 3.
Intranasal is ideal for: Lay responders and situations where needlestick injury risk is a concern, with effectiveness comparable to IM administration 4.