Naloxone
Naloxone, sold under the brand name Narcan among others, is a medication used to block the effects of opioids. It is commonly used for decreased breathing in opioid overdose. Naloxone may also be combined with an opioid (in the same pill) to decrease the risk of opioid misuse. When given intravenously, naloxone works within two minutes, and when injected into a muscle, it works within five minutes; it may also be sprayed into the nose. The effects of naloxone last about half an hour to an hour. Multiple doses may be required, as the duration of action of most opioids is greater than that of naloxone.
Naloxone-1