Medical Dosage Calculation Practice MEMORIZE these conversions: • • • • • • 1 oz= 30ml 1 tsp= 5ml 1 tbsp= 15ml 1 Cup=8 oz 2.2 lb = 1 kg Metric conversions: 1gm=1000mg, mcg to gm, etc. • After fundamentals course- will need to know how to calculate IV drip rates Basic Directions • Read each question carefully • Often there is more than one step to figure out the answer • Questions may have more info than you need to get the answer • Show your work • Determine what your goal is, especially to what unit the answer is supposed to be in- i.e. -is it asking for the per dose amount or daily amount, for number of mg or number tablets, etc. in the answer? • Look at the answer and see if it makes sense-i.e.-rarely will you be giving someone 80 pills. Resources • Read Potter & Perry, Fundamentals of Nursing, 8th edition, pages 574 to 577. • Purchase a dosage calculation book or program for nurses. • Go on line, search “medication dosage calculations” for resources on line. • Use basic algebra solving equations Practice Questions Answers at end… Good luck! #1 A client has an order for 125mcg of digoxin PO daily. How many milligrams will you administer to the client? #2 A patient’s order for heparin is 50units/kg and the patient weighs 198 pounds. How many units of Heparin will the patient receive? #3 The doctor has just order IV fluids of 1,000ml D5W with 20mEq Potassium to be infused over an 8 hour period. At what rate would you set the IV pump? #4 The order reads Isoniazid 300mg daily. The pharmacy supplies Isoniazid syrup 50mg/5ml. The nurse should administer _______ml per dose. #5 The patient is to receive Celestone 900 micrograms. You have a bottle of Celestone labeled 0.6mg/tablet. The patient will receive how many tablet(s) per dose? #6 How many milliliters of cough syrup should a child receive if the dose is 3 ounces and the child’s weight is 27kg? #7 Your patient’s order reads 7,500units of Heparin subcutaneously. Heparin comes in a 2ml vial of 5,000units/ml. How many milliliters of Heparin do you give the patient? #8 Order: Ancef 1g/50ml IVPB Q4H, infuse over 30 minutes. IV tubing is labeled 20 drops/ml. Calculate the flow rate in drops per minute for this antibiotic. #9 The MD orders Haldol 2mg by IM injection. You have a vial of Haldol labeled 5mg per 1ml. How many ml(s) would you administer? #10 The patient is to receive Gantrisin 50mg/kg daily in 4 divided doses. The patient weighs 44 pounds. How many mg(s) would the patient receive for a single dose? Answers 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 0.125mg 4,500 units 125ml/hr 30ml per dose. 1.5 tablets 90mls 1.5mls 33.3 gtt/min. 0.4ml 250mg/dose.