Several Math Practice Questions
by Kristin
1. How many grams of salicylic acid powder are needed to prepare 60 grams of a 25% w/w ointment if you have 100 grams of a 1% w/w ointment available to you? 13. Use the following concentrations to solve the problem. Lidocaine 1% Heparin 10,000units/ml solution Folic acid 5mg/ml 300mg Lidocaine= _ml 14. An IV fluid containing NS is running at 125ml/h. how many 1L bags will be needed per day? 15. A drug order requires 50ml of a 2% neomycin solution. How much neomycin concentrate (1g/2ml) is needed to fill the order? 16. Humulin N 100units/ml 10ml vials are available. The patient has a prescription that reads “10units Q AM and 15units Q PM." How many days will the vial last? 17. Cleocin T 2% topical product used for acne. How many grams of clindamycin would be contained in a 2oz container? 18. A physician orders a 5% ophthalmic ointment. How much drug (in grams) would be needed to prepare a 3 gram tube of ointment? 19. A medication order is received for a child for dexamethasone 0.15mg/kg/day divided into two doses. The patient weighs 11kg. Dexamethasone solution injection is available as 4mg/ml concentration. You are asked to prepare 4ml of a pediatric dilution of dexamethasone (final concentration 100mcg/ml) from the commercially available solution. a. How much of the dexamethasone solution is needed to prepare the pediatric dilution? b. How much sterile water for injection is needed in ml to prepare the pediatric dilution? c. How many ml of the dexamethasone pediatric dilution are needed to prepare one dose of the dexamethasone for this patient? 20. An order is received for piperacillin/tazabactom 3.375g IV every 6 hours in 100ml of NS infused over 1 hour. A bulk vial contains 40.5g of piperacillin/tazabactom. a. How many ml/min will the patient receive during each infusion? b. How many ml are needed to prepare one dose? c. How many doses can be prepared from one bulk vial? 21. An order is received for amiodarone 150mg in 100ml of D5W infused over 10 minutes. A 3ml vial (50mg/ml) of amiodarone solution is available to prepare the infusion. If the administration set delivers 15 drops/ml. a. How many drops per minute will this patient receive? b. At what rate (ml/min) should the medication be infused?

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