What are common symptoms of opioid use?

The correct choice highlights symptoms that are commonly associated with opioid use, which include pupillary constriction, euphoria, and CNS (central nervous system) depression.

Pupillary constriction, also known as miosis, is a classic sign of opioid use, as opioids act on receptors in the brain that control pupil size. Euphoria, or a sense of intense happiness or pleasure, is another hallmark of opioid action, particularly associated with their effect on the brain's reward pathways. CNS depression refers to a slowing down of brain activity, which can manifest in decreased respiration rates, sedation, and impaired cognitive function, all of which are well-documented effects of opioid use.

The other options present symptoms that may be related to different substances or medical conditions. For instance, while nausea and vomiting can occur with opioid use, the combination of respiratory depression and hallucinations is more characteristic of overdoses or mixed substance use, rather than typical opioid effects. Impulsive behavior, aggression, and psychosis are more commonly seen with stimulant drug abuse or certain psychiatric disorders. Additionally, increased energy, anxiety, and insomnia are associated with stimulants or withdrawal from depressants rather than the depressant effects of opioids.

Overall, option A accurately reflects the core