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Tricyclics are chemical compounds that contain three interconnected rings of atoms.

Many compounds have a tricyclic structure, but in pharmacology, the term has traditionally been reserved to describe heterocyclic drugs. Among these are antidepressants, antipsychotics, anticonvulsants, and antihistamines (as antiallergens, anti-motion sickness drugs, antipruritics, and hypnotics/sedatives) of the dibenzazepine, dibenzocycloheptene, dibenzothiazepine, dibenzothiepin, phenothiazine, and thioxanthene chemical classes, and others.

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  1. ^ Kay, G. G.; Harris, A. G. (1999). "Loratadine: a non-sedating antihistamine. Review of its effects on cognition, psychomotor performance, mood and sedation". Clinical and Experimental Allergy. 29 Suppl 3: 147–150. doi:10.1046/j.1365-2222.1999.0290s3147.x. PMID 10444229.