Which of the following drugs was initially developed as an antitubercular drug but later found to have mood elevating propeies: (A) Isoniazid, (B) Selegeline, (C) Fluoxetine, (D) Lithium
Answer is A. Refer Goodman Gilman 12th/1558. Isoniazid caused euphoria as an adverse effect. This lead to development of structurally similar drugs as antidepressants