Which of the following is often a symptom of opioid poisoning?

Opioid poisoning often leads to a significant decrease in a person's respiratory function, which can manifest as slowed or even halted breathing. Opioids act on the central nervous system, reducing the urgency to breathe and suppressing the respiratory drive. This can result in respiratory depression, which is life-threatening and requires immediate intervention. Recognizing this symptom is crucial for identifying an opioid overdose, as timely treatment can save lives. In contrast, the other options are typically not associated with opioid poisoning and reflect either heightened physiological responses or effects that are not characteristic of opioid use.