致谵妄药，致幻剂的一种，会使人进入谵妄状态。此概念是David F. Duncan 和 Robert S. Gold 为了与LSD等迷幻药物有所分别而引入。麻木、完全混乱、虚谈等状态较为常见。较著名的致谵妄药为阿托品。

Deliriants are a class of hallucinogen. The term was introduced by David F. Duncan and Robert S. Gold to distinguish these drugs from psychedelics and dissociatives, such as LSD and ketamine respectively, due to their primary effect of causing delirium, as opposed to the more lucid states produced by other hallucinogens (psychedelics and dissociatives). The term is generally used to refer to anticholinergic drugs.