Narcan (naloxone) is a nasal spray that serves an opioid antagonist and an anti-overdose solution. In the event of an overdose on opioids such as heroin or fentanyl, prompt administration of naloxone cancels the effects of the overdose by replacing opioids active on the receptors in the brain and prevents more opioids from binding.
Can You Overdose on Marijuana? – A marijuana overdose can occur when a person experiences severe health problems after ingesting too much of the drug. Symptoms of overdose may include hallucinations, elevated heart rate, and intense paranoia. Those that are experiencing these severe problems might require immediate medical attention.