context: A medication called naloxone can reverse the effects of an overdose of heroin or some types of painkillers. Paramedics and emergency room doctors have used it for years to save lives. In some states, if you, a family member, or a friend is addicted to heroin or narcotic painkillers known as opioids, you can carry naloxone. A pocket-size device that contains an injectable form of naloxone is available for use. A nasal spray version has also been approved for use and requires no special training to administer. Naloxone blocks the effects of drugs made from opium, or opioids. These include: heroin morphine oxycodone methadone fentanyl hydrocodone codeine hydromorphone buprenorphine Opioids slow your breathing. If you take too much of one, your breathing may stop and you could die. If given soon enough, naloxone can counter the overdose effects, usually within minutes. Deaths from overdoses of narcotic prescription painkillers more than tripled in the U. S. from 2000 to 2014. These drugs now kill more people than heroin and cocaine combined. Heroin use is also growing in the U. S. The 2012 National Survey on Drug Use and Health reported that 669,000 Americans use the illegal substance -- nearly twice as many as in 2007. Deaths from heroin overdoses quadrupled between 2002 and 2013. The rise in heroin use is believed to be linked to prescription drug abuse. Many people who abuse painkillers switch to heroin for two reasons: It is cheaper and often easier to get. Because of naloxone's effectiveness, the White House drug policy office now urges first responders, such as police and firefighters, to carry it. Naloxone is given by shot or nasal spray. A person who has overdosed may: be breathing very slow or not breathing have blue or purplish lips or fingernails be limp be vomiting or gurgling not wake up or respond if you try to rouse him If a person shows signs of an overdose: Call 911 right away. Begin rescue breathing, if the person isn't taking in air. Give the person naloxone. As an injectable medication, the naloxone kit, called Evzio, comes with two auto-injectors and a trainer device, so you can learn how to use it ahead of time. Naloxone wears off in about an hour. A person who has overdosed may stop breathing then and need another shot. It's important to call 911 and stay with the person until help arrives. He may need more doses of naloxone or other emergency care. The nasal spray form of naloxone should be given to the person when he/she is lying down. A second dose may be administered, if necessary. Get medical help as quickly as possible after treating someone with the nasal spray. Naloxone can save lives, but it can also cause: chest pain seizures symptoms of an allergic reaction, such as: hivestrouble breathingface, lip, and tongue swelling These require emergency help. Naloxone puts a person into withdrawal. He may: throw up shake fiercely sweat He may also have pain and burning on the skin where he got the shot, or in his hands and feet. Critics have opposed public access to naloxone, saying it would encourage abuse of heroin and other opioids, but no studies support that. The medical community widely supports making naloxone more easily available, because it saves lives. In more than half the U. S. and the District of Columbia, Good Samaritan laws protect a person who helps someone during an overdose.