This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General pharmacology, Subject name: Pharmacology
Drug having narrow therapeutic range is: 
Select and explain. 
A. Lithium, B. Seraline, C. Roboxetine, D. Dothiepin
A: Lithium
Answer: A: Lithium 
Explanation: Therapeutic range is bounded by the dose which produces a minimal therapeutic effect and the dose which produces maximal acceptable adverse effect Lithium is an unsafe drug with a narrow therapeutic range- 0.6 - 1.2 mmol/L. Ref: KD Tripathi Pharmacology 7th edition (page no;56 )