Heroin is an example of a(n):

Heroin is an example of a(n):

• A. Hypnotic
• B. Opioid
• C. Cholinergic
• D. Sympathomimetic

Answer: (B)

This question tests drug classification by mechanism of action. Heroin is an opioid because it is a semi-synthetic compound derived from morphine that binds to μ-opioid receptors in the brain and spinal cord, acting as an agonist. This receptor activation produces analgesia, euphoria, and, importantly, respiratory depression. These effects define opioids and distinguish them from other classes: hypnotics are sleep-inducing drugs that typically affect GABA systems; cholinergic agents involve acetylcholine signaling; and sympathomimetics mimic the sympathetic nervous system. So, the best label for heroin is opioid.

This question tests drug classification by mechanism of action. Heroin is an opioid because it is a semi-synthetic compound derived from morphine that binds to μ-opioid receptors in the brain and spinal cord, acting as an agonist. This receptor activation produces analgesia, euphoria, and, importantly, respiratory depression. These effects define opioids and distinguish them from other classes: hypnotics are sleep-inducing drugs that typically affect GABA systems; cholinergic agents involve acetylcholine signaling; and sympathomimetics mimic the sympathetic nervous system. So, the best label for heroin is opioid.