Drug having very narrow therapeutic range is-
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
Lithium
Seraline
Roboxetine
Dothiepin
Miscellaneous