Drug having very narrow therapeutic range is-: (A) Lithium, (B) Seraline, (C) Roboxetine, (D) Dothiepin
Answer is A. Lithium may also be used to treat alcoholism, schizoaffective disorders, and cluster headaches . Thus, lithium is an indispensable pharmaceutical component of modern psychiatric therapy. Unfounately, lithium also has a narrow therapeutic index, with therapeutic levels between 0.6 and 1.5 mEq/L Ref Davidson 23rd edition pg 1200