<prompt> Answer this question truthfullyWhat type of histamine receptor antagonists may be used to treat vestibular nausea and motion sickness, and what are some examples of drugs in this class?  <response>: <reason> 1st generation H1 histamine receptor antagonists may be used to treat vestibular nausea and motion sickness. Examples of drugs in this class include diphenhydramine, dimenhydrinate, and cyclizine. 