Naloxone is used in emergencies for known or suspected opioid overdose. Symptoms of serious opioid overdose may include unusual sleepiness, difficulty waking up, or breathing problems. Other symptoms may include pinpoint pupils, slow heartbeat, or low blood pressure. If someone shows serious overdose symptoms, naloxone should be given right away, as slow/shallow breathing can cause permanent brain damage or death. Medical help should be sought immediately after giving the first dose, as symptoms may return after treatment. This medication is an opioid antagonist, which works by blocking the effects of opioids in the brain.
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