Question

A cough medicine contains 0.15% (w/v) dextromethorphan, a cough suppressant, and 3.4% (w/v) guaifenisin, an expectorant. How many milligrams of each drug would you obtain from 2.0 tsp of cough syrup? (1 tsp = 4.93 mL) mg dextromethorphan mg guaifenisin

Answer 1

100 ml of the syrup contains 0.15 g of dextromethorphan

Therefore, 2 tablespoons of syrup (4.93*2 ml) contains 4.93*2 ml *0.15 g/ 100 ml= 0.0148 g= 14.8 mg of dextromethorphan.

Also, 100 ml of syrup contains 3.4 g of guaifenisin

Therefore, 4.93* 2 ml of syrup contains 3.4 g *4.93*2 ml/100 ml = 0.335 g = 335 mg of guaifenisin.

Thank You!