What symptom is a sign of fentanyl poisoning?

Fentanyl poisoning is associated with significant impairment of motor functions and coordination. Difficulty speaking or walking can arise due to the drug's depressant effects on the central nervous system. Fentanyl, an opioid, can cause profound sedation and muscle relaxation, leading to challenges in maintaining physical control and clear communication. Opioid toxicity can also result in respiratory depression, which further exacerbates these symptoms. This makes difficulty in both speech and movement prominent indicators of fentanyl exposure or poisoning.

In contrast, increased energy or alertness would typically not manifest with opioid poisoning, as these substances generally lead to drowsiness or decreased responsiveness rather than enhanced physical or cognitive performance. Rapid heartbeat can occur in various situations but is not a definitive indicator of fentanyl poisoning, where bradycardia (slowed heart rate) may actually be more indicative due to the depressant effects of the drug.