Final answer:
A Narcan kit usually includes a single dose because it is designed for emergency use to quickly reverse the effects of an opioid overdose, aiding in restoring breathing and consciousness until further medical help arrives.
Step-by-step explanation:
The standard dose of naloxone, or Narcan, in a kit is typically a single dose because it is meant to quickly reverse the effects of an opioid overdose in an emergency situation. Opioids can dangerously slow or stop a person's breathing, which is often the cause of overdose fatalities.
A dose of Narcan helps to temporarily restore normal breathing and consciousness, allowing time for emergency medical services to arrive and provide further treatment. Overdose-reversal drugs like Narcan are a critical component of recovery services and are increasingly important in combatting the opioid epidemic through their widespread distribution and use.