A 29-year-old man is brought to the emergency department for abnormal behavior. He is confused and unable to provide history. He was found outside yelling at the sky. His blood pressure is 150/90 mm Hg, pulse is 110 bpm, temperature is 100.5 °F, and respiratory rate is 22 breaths/min. On exam, he appears to be seeing things that others are not seeing and answers questions in a bizarre fashion. He is noted to have abnormal vertical movements of his eyes bilaterally. Urine toxicology is pending. The substance taken by this patients belongs in what category?