This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Addition of which of the following agent can help in elimination of 15-20 tablets of 10 mg dextroamphetamine - 
Select and explain. 
A. Acetazolamide, B. NH4 CI, C. Penicillamine, D. Na HCO3
B: NH4 CI
Answer: B: NH4 CI 
Explanation: Ans. is 'b' i.e., NH4CI Acidification of urine o Basic drugs are more ionized at acidic pH. So, acidification of urine should be done in poisoning of these drugs. o Examples of such basic drugs are morphine, amphetamine, dexfenfluramine. o Acidification of urine is done by iv infusion of arginine hydrochloride followed by ammonium chloride (NH4CI) by mouth.