CAMDEN -- A particularly lethal brand of heroin marked with a Batman stamp is responsible for at least 49 non-fatal overdoses in the last six days, according to New Jersey State Police.

Heroin packaging stamped with 'Batman.'

Police warned drug users that while all heroin is potentially lethal, the kind stamped with Batman is causing overdoses by the dozens and should be avoided.

Cooper University Health Care's ambulances treated at least 49 suspected overdoses in the county area between Tuesday and Saturday morning, police said.

When patients were revived after overdosing, the only kind of heroin that they reported using had the Batman stamp.

The Courier-Post reported that the Batman stamp was found on free samples of heroin believed to be coming from Camden over the past two weeks.

The newspaper reported that an alert from the New Jersey Regional Operations and Intelligence Center stated that the heroin is so lethal that emergency responders may have to use extra Narcan to stop the overdose.

The State Police shared the information about the Batman-stamped heroin on its Facebook page and asked others to do the same.

"We're asking you to share this because it may save a life," the post said. "Not all addicted are too far gone to recover."

Rebecca Everett may be reached at reverett@njadvancemedia.com. Follow her on Twitter @rebeccajeverett. Find NJ.com on Facebook.