Health-care resource use among patients who use illicit opioids in England, 2010-20: A descriptive matched cohort study.

Patients who use illicit opioids in England appear to access health services more often than people of the same age and sex who do not use illicit opioids among a wide range of health-care settings. The difference is especially large for emergency care, which probably reflects both episodic illness and decompensation of long-term conditions.