Increasing Presence of a New Adulterant BTMPS in the Illicit Drug Supply

By:Natalie Butler

The Washington/Baltimore HIDTA Information Bulletin by Butler et al. highlights the emergence of Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (BTMPS), or Tinuvin 770, in Maryland’s illicit drug supply. BTMPS, an industrial UV stabilizer not approved for human use, was found in 0.7% of drug-positive samples (Jan–Mar 2025), often alongside fentanyl, heroin, and xylazine. It acts as a potent L-type calcium channel blocker and non-competitive antagonist at nicotinic receptors and does not respond to naloxone. First detected in 2024, BTMPS has since spread to at least 11 states. In New Mexico, it appeared in counterfeit M30 tablets with reports of severe withdrawal. Individuals who have used it describe BTMPS as smelling like bug spray or burning plastic.

Washington/Baltimore HIDTA Investigative Support Center , 2025. 3p.