Fentanyl has become a popular additive among heroin dealers in the U.S. It produces a more intense high. It also kills more people because it is 80-100 times more potent than heroin Paramedics started to respond to emergency calls at around 3:30 p.m. “We used up almost the whole supply of Narcan in the city,” assistant Fire Chief Matt Marcarelli told to the media, referring to the use of Naloxone, also known as Narcan, which is administered to someone who is overdosing on heroin to reverse its effects. The fire department was working on obtaining more Narcan from Yale-New Haven Hospital and AMR ambulance service in Hartford. City officials activated the Everbridge emergency phone-notification system. The federal Drug Enforcement Administration with the U.S. Attorney’s Office has established a task force to deal with the heroin/fentanyl epidemic.