What Is Narcan and Why it Matters? Narcan, also known as naloxone, is a medication that can temporarily reverse an opioid overdose. It works by blocking the effects of opioids on the brain, particularly the part that slows or stops breathing. When given in time, Narcan can save a person’s life and allow them to breathe again until emergency help arrives. Where Can I Get Narcan? In Canada, naloxone kits are widely available for free through pharmacies, public health units, and