Which of the following is a symptom of Phencyclidine Intoxication?

Phencyclidine (PCP) intoxication is characterized by specific symptoms that are distinct to its effects on the central nervous system. One of the hallmark signs of PCP intoxication is the presence of vertical or horizontal nystagmus, which refers to the involuntary eye movement in vertical or horizontal directions. This symptom occurs due to PCP's action as a dissociative anesthetic, impacting coordination and perceptual abilities, including oculomotor function.

Nystagmus is significant because it indicates a disruption in normal visual processing and can help in identifying PCP use. Other common symptoms of PCP intoxication may include altered perceptions, agitation, and confusion, but nystagmus serves as a particularly specific diagnostic indicator associated with this substance.

In contrast, low blood pressure, visual impairments, and severe anxiety or restlessness do not specifically indicate PCP intoxication. While they may occur in varying contexts of substance use or other medical conditions, they lack the specificity that nystagmus has for identifying PCP-related effects. Therefore, the presence of vertical or horizontal nystagmus is a clear and defined symptom indicating PCP intoxication.