GPhC Pharmaceutical Calculations

Question 1

A prescription requires 150mL of a 1 in 10,000 solution of potassium permanganate. How many milligrams of potassium permanganate are needed?

Accepted Answer

15mg

Answer

0.015mg

Answer

1.5mg

Answer

150mg

Question 2

A child weighing 22kg requires amoxicillin at a dose of 25mg/kg/day in three divided doses. The suspension available is 250mg/5mL. What volume should be given per dose?

Accepted Answer

7.3mL

Answer

3.7mL

Answer

11mL

Answer

22mL

Question 3

How many millimoles of sodium are in 500mL of sodium chloride 0.9% infusion? (Molecular weight of NaCl = 58.5, Na = 23, Cl = 35.5)

Accepted Answer

77 mmol

Answer

38.5 mmol

Answer

154 mmol

Answer

308 mmol

Question 4

A pharmacist needs to dilute a 95% v/v ethanol solution to produce 500mL of 70% v/v ethanol. What volume of the 95% solution is required?

Accepted Answer

368mL

Answer

263mL

Answer

432mL

Answer

475mL

Question 5

A patient is prescribed an IV infusion of 1 litre of 5% glucose to run over 8 hours using a giving set that delivers 20 drops/mL. What is the required drip rate in drops per minute?

Accepted Answer

42 drops/min

Answer

21 drops/min

Answer

63 drops/min

Answer

84 drops/min

Question 6

A cream contains 0.025% w/w of betamethasone valerate. How many micrograms of betamethasone valerate are in 30g of the cream?

Accepted Answer

7,500 micrograms

Answer

750 micrograms

Answer

75,000 micrograms

Answer

750,000 micrograms