Which drug is associated with symptoms like psychosis to coma, alongside specific nystagmus?

The drug associated with symptoms such as psychosis to coma, along with specific nystagmus, is phencyclidine (PCP). PCP is a dissociative anesthetic that can cause profound alterations in sensory perception and cognitive functioning. Users may experience hallucinations, agitation, and significant changes in behavior, which can progress to more severe states such as psychosis and even coma in cases of high doses or extreme intoxication.

Additionally, specific nystagmus—an involuntary eye movement—is a hallmark sign associated with PCP use. This can manifest as a characteristic side effect during intoxication, distinguishing it from other substances. While other drugs in the options can cause various mental health issues or intoxication symptoms, none share the specific combination of psychosis, coma, and distinctive nystagmus in the same way that PCP does. Thus, the characteristics associated with PCP empower healthcare providers to recognize and manage cases of PCP intoxication effectively.