‘10 times more powerful than fentanyl’: SF issues public warning as fake opioid detected in first fatal overdose

April 24, 2026

SAN FRANCISCO (KRON) — One of two non-fentanyl synthetic opioids detected for the first time in a fatal overdose this month in San Francisco is considered to be 10 times stronger than fentanyl, according to a warning issued Friday by the city’s Department of Public Health..