APC Pharmaceutical Calculations 3

Question 1

Using the alligation method, what volume of 70% alcohol is needed to prepare 500 mL of 50% alcohol using 70% and 30% alcohol?

Accepted Answer

250 mL

Answer

125 mL

Answer

375 mL

Answer

500 mL

Question 2

A morphine infusion is prepared as 50 mg in 50 mL of normal saline running at 3 mL/hour. How many mg/hour is the patient receiving?

Accepted Answer

3 mg/hr

Answer

1 mg/hr

Answer

5 mg/hr

Answer

10 mg/hr

Question 3

A patient's creatinine clearance is 30 mL/min. Normal gentamicin dosing is every 24 hours (based on normal CrCl of 120 mL/min). If the interval is extended proportionally, what is the new interval?

Accepted Answer

96 hours

Answer

48 hours

Answer

72 hours

Answer

120 hours

Question 4

A prescription requires a 1:200 w/v solution. How many milligrams of solute are contained in 400 mL of this solution?

Accepted Answer

2000 mg

Answer

500 mg

Answer

1000 mg

Answer

4000 mg

Question 5

A powder for injection contains 1.5 g. After reconstitution, the final volume is 60 mL. What is the final concentration in mg/mL?

Accepted Answer

25 mg/mL

Answer

15 mg/mL

Answer

40 mg/mL

Answer

50 mg/mL

Question 6

A pharmacist dispenses a 14-day supply of a medication prescribed as 2 tablets twice daily. How many tablets are dispensed in total?

Accepted Answer

56 tablets

Answer

28 tablets

Answer

42 tablets

Answer

70 tablets

Question 7

A heparin infusion contains 25,000 units in 250 mL of normal saline. The prescribed dose is 1,000 units/hour. At what rate should the pump be set in mL/hour?

Accepted Answer

10 mL/hr

Answer

5 mL/hr

Answer

15 mL/hr

Answer

20 mL/hr