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You mix together 50 g of 0.5% w/w hydrocortisone cream and 25 g of 2% w/w sulphur cream (the creams are compatible). What is the final concentration of these two drugs?

In your pharmacy you have a stock solution of drug F with a concentration of 25% w/v. Drug F is used as a mouthwash at a concentration of 0.25% w/v. You are requested to supply 50 mL of a solution of intermediate strength, such that the patient will dilute this solution 1 in 20 to get the correct concentration immediately before use. Which of the following should be the concentration of the intermediate solution?

An 11-month old baby, who weighs 8.8kg, requires dalteparin sodium at a dose of 200 units/kg daily, given in two divided doses. Dalteparin sodium is available as a 10000 units/4mL solution for injection.

How much solution is required for each dose? Give your answer to two decimal places.

65-year old patient requires Vamin 9®, a total parenteral nutritional feed, to be administered over 3 hours. One 20mL vial of Addiphos® solution and one 10mL vial of Additrace® solution for infusion are added to 500mL of Vamin 9®. The administration set is calibrated to 20 drops per mL.

Calculate the number of drops per minute to be given if the patient is to receive all of the solution in the specified time. Give your answer to the nearest whole number.

A patient has been prescribed an injection solution containing azithromycin 50mg in 1mL. 500mg of azithromycin powder for reconstitution into an injection is available in a vial. The displacement value for the powder is 0.05mL per 100mg.

What volume of sterile diluent should be added to the azithromycin powder to produce the required concentration?