The most frequently used drugs are tricyclic antidepressants, which received their name from the organization of their chemical structures, in particular the systems consisting of two benzene rings joined to a central 7-membered ring with a dialkylaminoalkyl…

Incidence and prevalence estimates vary slightly depending on the methodology, but commonly cited figures are that approximately one-third of Americans have symptoms of acute or intermittent insomnia, and that approximately 10% have chronic insomnia.…