SWAN RIVER, Man. - RCMP believe they have recovered most of a haul of prescription drugs, including potentially lethal fentanyl, that were stolen from a pharmacy in Swan River, Man.

The pharmaceuticals and some other items were taken sometime Wednesday night or early Thursday morning.

The theft prompted police to issue a warning about the missing fentanyl and its possible hazardous effects.

Mounties say a search of a home in the west-central community early Thursday evening led to a majority of the stolen drugs being recovered.

Charges are pending against two Swan River residents -- a 34-year-old man and a 32-year-old woman.

Fentanyl is a highly addictive synthetic pain reliever that's estimated to be up to 100 times more potent than morphine, but police say it effects are potentially lethal when mixed with other drugs.