BOSTON— Boston’s drug cops turned an ordinary patrol into a fentanyl fiasco Thursday night — slapping cuffs on two alleged traffickers and yanking 81 grams of poison off the streets before it could ruin more lives.

Police say the takedown unfolded near Shawmut Avenue and North Hampton Street, where officers from the Roxbury Drug Control Unit spotted what looked like a street deal in progress. Instead of looking the other way, cops moved in — and it didn’t take long before the stash started spilling out.

First up, officers tailed one man and found him lugging around two plastic bags of fentanyl, weighing in at 15 grams. Not exactly pocket change. Then came the big score: backup patrol units stopped another suspect driving on Columbus Avenue and allegedly found several more bags — nearly 66 grams worth — plus $1,642 in cold hard cash. That’s not your average paycheck.

In total, Boston Police say 81 grams of the deadly synthetic opioid were seized. For perspective, that’s enough to send entire neighborhoods into the overdose ward — and it’s now sitting in an evidence locker instead of making its way into veins across the city.

The suspects, 30-year-old Angel Mejia-Torres of Dorchester and 28-year-old Michael Muriel-Marrero of Boston, weren’t exactly cooperative. Mejia-Torres faces trafficking and distribution charges. Muriel-Marrero is charged with trafficking and resisting arrest — because of course he didn’t go quietly.

Both men were hauled into Roxbury District Court, where they’re expected to be arraigned.

The bust is the latest skirmish in Boston’s ongoing street war with fentanyl — a fight residents say City Hall has done little to win. For now, at least, 81 grams of poison are off the streets and two accused dealers are behind bars.