Heroin is an example of which drug category?

• A. Stimulant
• B. Opioid
• C. Hallucinogen
• D. Benzodiazepine

Answer: (B)

Heroin is an opioid, a class of drugs derived from morphine that binds to opioid receptors in the brain and spinal cord. This action produces pain relief and a sense of euphoria, but it can dangerously depress respiration, especially in overdose. That respiratory suppression is a hallmark reason heroin is classified as an opioid. Other categories—stimulants (which increase alertness and heart rate), hallucinogens (which alter perception), and benzodiazepines (sedatives used for anxiety and sleep)—operate through different mechanisms and have different clinical features. In an EMS context, an opioid overdose is suggested by slowed or shallow breathing, pinpoint pupils, and reduced consciousness, and the critical treatment is airway support plus naloxone if indicated, with continuous monitoring and rapid transport.