Researchers were searching for drugs to treat schizophrenia when they came across imipramine,which alleviated the symptoms of depression,although it was not effective against schizophrenia.It became the first of a class of drugs,all sharing a similar molecular structure,called:

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Imipramine was the first of a class of drugs known as tricyclic antidepressants, which are characterized by their three-ring chemical structure and are used to treat depression.

Researchers Were Searching for Drugs to Treat Schizophrenia When They