Emergency Management of Antiretroviral Overdose
For a 30-year-old man who ingested 18 tablets of antiretroviral medication, provide supportive care with monitoring in a healthcare facility for at least 24 hours, as antiretroviral overdoses are generally not life-threatening and most patients recover without serious complications.
Immediate Assessment and Stabilization
Upon presentation, assess the patient's:
- Vital signs (heart rate, blood pressure, respiratory rate, temperature)
- Mental status (level of consciousness, orientation)
- Cardiac rhythm via continuous ECG monitoring
- Baseline laboratory tests: complete metabolic panel including liver enzymes (AST, ALT), serum creatinine, electrolytes, serum bicarbonate, and anion gap
The specific antiretroviral class matters for risk stratification. Protease inhibitors (PIs) can cause QT prolongation and ventricular arrhythmias 1, while nucleoside reverse transcriptase inhibitors (NRTIs) carry risk of lactic acidosis 2.
Clinical Monitoring Protocol
First 6-24 hours:
- Continuous cardiac monitoring for QT prolongation and arrhythmias
- Neurological assessments every 2-4 hours (drowsiness, lethargy, altered consciousness are common) 3, 4, 5
- Monitor for gastrointestinal symptoms: nausea, vomiting, abdominal pain, diarrhea 2, 5
- Serial vital signs every 2-4 hours
Laboratory monitoring:
- Repeat metabolic panel at 6 hours and 24 hours
- Check serum lactate if patient develops unexplained tachypnea, dyspnea, abdominal distention, or persistent GI symptoms 2
- Monitor serum creatinine at 24 hours and again at 5-7 days post-ingestion (tenofovir can cause delayed renal dysfunction) 3
Supportive Management
No specific antidote exists for antiretroviral overdose. Management is entirely supportive 6, 3, 4, 5:
- Intravenous hydration: Administer crystalloid fluids to maintain adequate urine output and prevent renal injury
- Antiemetics: For nausea/vomiting as needed
- Cardiac interventions: If QT prolongation or ventricular arrhythmias develop, administer magnesium sulfate IV 1
- Do NOT induce emesis or perform gastric lavage - these are not indicated and may cause harm
Critical Warning Signs
Monitor closely for these potentially serious complications:
Lactic acidosis (rare but high mortality 2):
- Unexplained persistent abdominal pain, distention, or vomiting
- Tachypnea or dyspnea
- Generalized weakness or ascending neuromuscular weakness
- Anion gap >16 mmol/L
- Serum lactate >5 mmol/dL indicates serious toxicity; >10 mmol/dL is life-threatening 2
Cardiac toxicity (primarily with protease inhibitors 1):
- QTc prolongation
- Ventricular arrhythmias (may require magnesium sulfate)
Hepatotoxicity 2:
- Transaminase elevation >3-5 times baseline
- Right upper quadrant pain, jaundice (rare but can progress rapidly)
Disposition and Follow-up
Most patients can be discharged after 24 hours of observation if:
- Vital signs remain stable
- No cardiac arrhythmias detected
- Laboratory values are normal or near-baseline
- Patient is asymptomatic or symptoms are resolving 3, 5
Mandatory psychiatric evaluation before discharge for intentional overdose 6, 3.
Follow-up at 5-7 days to recheck:
- Serum creatinine (delayed renal toxicity can occur) 3
- Liver enzymes if initially elevated
- Clinical reassessment
Evidence Quality Note
The available evidence on antiretroviral overdose consists primarily of case reports and small case series 6, 3, 4, 5, 1. The Texas Poison Center data showed that 88.7% of antiretroviral-only exposures were not serious, with most managed outside healthcare facilities 5. However, given the potential for serious complications like lactic acidosis (mortality rate high when it occurs 2) and cardiac arrhythmias 1, initial healthcare facility observation is the prudent approach, even though most patients will have benign courses.
The 18-tablet ingestion represents a significant overdose requiring medical evaluation, but prognosis is generally favorable with appropriate supportive care and monitoring.