Question

A patient is administered 20 grams of a drug to be given as a 50% injection at a constant rate over a period of 5 hours. Which of the following is/are correct?

A-The patient will receive 50 ml of the drug 50% injection by the end of the 5 hours delivery period

B-After 2 hours, the patient will have received 15 grams of the drug

C-The amount of the drug in 30 ml of the injection is 15 grams

D-None of above

Answer 1

Answer is C

In option A -> 50 % w/v of drug So 100 mL of Volume will have 50 g of drug.

  This means, 20X100/50 = 40 mL will have 20 g of drug

In option B -> Since the drug is given at a constant rate which means 20 g of drug is given in 5 hours. So 4 g must be given every hour. (20 g/5 hr = 4 g/hr)

This means, 12 g will be delivered after 3 hours.

In option C -> The injection is 50% w/v. (50g/100mL)

50x30 = 100 = 15

So 30 ml of injection will have 15 g of drug.