A nurse is caring for a client who has been brought into an emergency department of a large hospital. The client's family state that the client "took some kind of drugs." The client is dizzy, has recently vomited, and is experiencing paranoia, yelling, "Stay away from me! You are going to kill me?" The client alternates yelling with mumbling and gesturing. Their eyes are darting back and forth as they are talking to the wall. The nurse should suspect the client has used which of the following substances?

A. Opioids (such as heroin, morphine, or oxycodone) typically produce sedation, respiratory depression, constricted pupils, and euphoria, rather than paranoia, hallucinations, or disorganized behavior. The client’s hyperactive, paranoid, and hallucinatory presentation is not consistent with opioid use. B. Anabolic steroids can cause mood changes, aggression (“roid rage”), or irritability, but they do not usually produce acute hallucinations, paranoia, or rapid eye movements associated with talking to unseen stimuli. C. Stimulants (such as cocaine or methamphetamine) can cause agitation, increased energy, tachycardia, and paranoia, but although stimulant intoxication may include hallucinations, the client’s pronounced visual hallucinations (talking to walls, darting eyes), disorganized speech, and mumbling alternating with yelling are more characteristic of hallucinogen use. D. Hallucinogens (such as LSD, psilocybin, or PCP) often cause visual and auditory hallucinations, paranoia, disorganized thought, and bizarre behavior. The client’s talking to the wall, mumbling, yelling, eye darting, and paranoid statements align with hallucinogen intoxication. Nausea and vomiting are also common early effects.