San Francisco health officials have confirmed the city’s first fatal overdose involving MGM-15 synthetic opioid, a powerful semi-synthetic drug derived from kratom that has been circulating in retail stores. The San Francisco Department of Public Health and the Office of the Chief Medical Examiner issued a public safety alert following the late-September death of an adult resident.
According to investigators, the victim consumed tablets from a product sold under the brand name “Script Botanicals x Maui Labs.” Toxicology testing confirmed the presence of dihydro-7-hydroxymirtragynine—commonly known as MGM-15—in both the decedent’s system and the remaining product packaging. Health officials noted that the packaging did not list kratom or its derivatives among its ingredients.
Mislabeled Supplements and Hidden Dangers
The dangerous compound has frequently turned up in smoke shops and gas stations hidden inside products deceptively marketed as “uncaria tomentosa” or “cat’s claw.” While cat’s claw is a legitimate South American plant traditionally sold as an herbal remedy, illicit manufacturers have utilized these botanical names to mask the presence of potent, lab-created substances.
Experts estimate that MGM-15 is up to 50 times more potent than morphine. The U.S. Drug Enforcement Agency (DEA) has classified the substance as a Schedule 1 drug, meaning it carries no approved medical use and is illegal for sale. Health authorities emphasize that ingesting high doses of the compound can severely depress breathing, lead to fatal overdoses, and cause physical dependence or severe withdrawal symptoms with regular use.
Regional Warnings and Ongoing Investigation
The tragic incident in San Francisco mirrors similar public health concerns raised in other parts of the country. Investigations in Utah and Washington have previously linked MGM-15 and related semi-synthetic compounds, such as mitragynine pseudoindoxyl, to fatal overdoses and poison center warnings.
Public health agencies and poison control centers are urging healthcare providers and the public to remain vigilant about unregulated botanical supplements sold outside traditional pharmacies. Authorities continue to investigate how these mislabeled products are distributed and are warning consumers that items purchased at local gas stations and smoke shops may contain undisclosed, highly dangerous narcotics.
