<unk>  is a first-generation antihistamine (nonselective H1 antagonist) of the piperazine class. It is structurally and pharmacologically similar to buclizine, cyclizine, and hydroxyzine, but has a shorter half-life of six hours compared to cyclizine and hydroxyzine with about 20 hours (though half-life should not be confused with duration). It is used as an antivertigo/antiemetic agent, specifically in the prevention and treatment of nausea, vomiting, and dizziness associated with motion sickness.<unk>  is sometimes combined with opioids, especially ones of the open-chain class like methadone, dextropropoxyphene, and dipipanone. Similarly, Diconal is a combination drug containing dipipanone and cyclizine.
Meclizine
Cetirizine
Levocetirizine
Diphenhydramine
Chloropyramine
Ethacizine
Benadryl
Budesonide