What symptom is characteristic of opioid intoxication?

Pupillary constriction is a hallmark symptom of opioid intoxication, often referred to as "miosis." Opioids tend to stimulate the parasympathetic nervous system, leading to a decrease in pupil size. This is a distinguishing feature that sets opioid intoxication apart from other types of drug intoxications, which may present with different pupil responses. For example, stimulants typically cause pupillary dilation (mydriasis), while other substances may have varied effects.

Recognizing pupillary constriction is important in a clinical setting, as it aids healthcare providers in diagnosing opioid overdoses quickly, allowing for prompt intervention. In cases of acute opioid exposure, patients might also show other signs like respiratory depression and altered mental status, but the specific sign of pupillary constriction is integral to the diagnosis.