One label of co-use can conceal different exposure histories.
The Taiwan cohort compared opioid-only users with continuing, past and newly recorded benzodiazepine-use patterns. Each comparison group had higher adjusted odds of emergency visits and hospitalization, but the sizes of the associations differed.
The database recorded prescription duration rather than confirmed consumption or dose adherence. Healthcare utilization includes many causes, and underlying illness can influence both prescribing and visits. Past-use classification does not prove active simultaneous exposure at an event.
Identify the exposure definition rather than treating every group as concurrently intoxicated. These associations cannot establish the drug cause of a particular emergency visit. An individual opinion requires timing, actual ingestion, diagnoses, co-medications and clinical findings, not a category name alone.
Source: PMC12386390, supplied full-text paper. Findings are paraphrased; forensic implications are an interpretation.
Related: Bronchiolitis Withdrawal Model Found an Opioid Association but No Clear Benzodiazepine Association.