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Tricyclics arecyclicchemical compounds that contain three fusedrings of atoms.

Many compounds have a tricyclic structure, but inpharmacology, the term has traditionally been reserved to describeheterocyclic drugs. They includeantidepressants,antipsychotics,anticonvulsants, andantihistamines (asantiallergens, anti-motion sickness drugs,antipruritics, andhypnotics/sedatives) of thedibenzazepine,dibenzocycloheptene,dibenzothiazepine,dibenzothiepin,phenothiazine, andthioxanthenechemical classes, and others.

• Promethazine and other first generation antihistamines with a tricyclic structure were discovered in the 1940s.
• Chlorpromazine, derived from promethazine originally as a sedative, was found to have neuroleptic properties in the early 1950s, and was the firsttypical antipsychotic.
• Imipramine, originally investigated as an antipsychotic, was discovered in the early 1950s, and was the firsttricyclic antidepressant.
• Carbamazepine was discovered in 1953, and was subsequently introduced as an anticonvulsant in 1965.
• Clozapine, a derivative of imipramine, was synthesized in 1958 and entered the European market in 1972 under the nameLeponex.
• Antidepressants with a tetracyclic structure such asmianserin andmaprotiline were first developed in the 1970s astetracyclic antidepressants.
• Loratadine was introduced as a non-sedating second generation antihistamine in the 1990s.^[1]

Antidepressants
Imipramine	Amitriptyline	Iprindole	Tianeptine	Doxepin
Antipsychotics
Chlorpromazine	Thioridazine	Chlorprothixene	Loxapine	Clozapine
Antihistamines
Promethazine	Cyproheptadine	Latrepirdine	Loratadine	Rupatadine
Others
Carbamazepine	Carvedilol		Cyclobenzaprine	Pizotifen

• Bisulepin
• Tetracyclic
• Tricyclic tropane analogs
• Heterocyclic

• Tricyclic compounds

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