This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia, Subject name: Pharmacology
Which of the following is a metabolite of carisoprodol? 
Select and explain. 
A. Doxylamine, B. Meprobromate, C. Dimethadione, D. Amphetamine
B: Meprobromate
Answer: B: Meprobromate 
Explanation: Ans. (B) Meprobamate(Ref: Goodman and Gilman 11th/e p422)Meprobamate was used as a CNS depressant drug but is rarely indicated now due to its addictive properties. It is a metabolite of carisoprodol, which is used as a centrally acting skeletal muscle relaxant.