# DRUG CALCULATIONS FOR REGISTERED NURSES ADULT SERVICES

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1 Serving the people of north east Essex DRUG CALCULATIONS FOR REGISTERED NURSES ADULT SERVICES A Programmed Approach - It is essential you read this pack & practice the questions prior to your drug calculation test - This pack provides you with all the information & formulae needed to answers questions in the test - The test comprises of 10 questions, which cover a variety of drug calculations - You will be given 30 minutes in which to complete the test - Calculators can be used - You must achieve 100% to pass the test Colchester Hospital University NHS Foundation Trust Page 1 of 12

3 Now try these examples: 1. Digoxin mg How many micrograms? 2. Digoxin 125mcg How many milligrams? 3. Paracetamol 0.5g How many milligrams? 4. Thyroxine 0.05mg How many micrograms? B) Drug dosage For some drugs the dosage required is calculated on a body weight basis. Body weight is measured in kilograms (kg) and so this dose is usually quoted as mg per kg. Other drugs (particularly cytotoxins) are prescribed in terms of the patient s body surface area, which is obtained from nomograms. Surface area is measured in square metres and so dosage is quoted as mg per square metre (m²). Therefore, for an individual patient, dosage required is obtained by MULTIPLYING the number of milligrams by that patient s weight or surface area. Now try these examples: 70kg man is to have gentamicin 2mg per kg. Dose required: 70 x 2 = 140mg 5. An 85kg patient requires Lorazepam 25mcg/kg. How many mcg? 6. 45kg woman requires gentamicin 2mg/kg. How many mg? 5. 85x25= 2125mcg (2.125mg) 7. A patient weighing 48kg, 160cm tall has a surface area of 0.92m² (from nomogram). What dose of Cisplatin 50mg / m² 6. 45x2= 90mg 7. 50x0.92= 46mg Colchester Hospital University NHS Foundation Trust Page 3 of 12

4 C) Calculating drip rates A standard IV giving set administers 20 drops per ml. Blood giving sets administer 15 drops per ml of blood. The formula to work out drop per minute is: - ml per hour Minutes per hour (60) x drops per ml = drops per minute We have 1 litre of 5% Glucose which is prescribed over 8 hours Work out the number of ml per hour = I litre i.e ml divided by 8= 125 ml per hour x 20 = 42 drops per minute Or 300 ml of blood is to be given over 3 hours. I.e. 300 divided by 3 = x 15 = 25 drops per minute Now try these examples: 8. 1 litre bag of Compound Hartman s Solution is to be infused over 12hours. How many drops per minute is this? mls of blood is to be infused over 2 hours. How many drops per minutes is this? mls of 5% dextrose is to be infused over 4 hours. How many drops per minute is this? X 20 = 28 drops per minute X 15 = 38 drops per minute X 20 = 42 drops per minute Colchester Hospital University NHS Foundation Trust Page 4 of 12

5 D) Drug Concentration i) mg per ml There are various ways of quoting the strength of drugs in liquid solutions for oral or parenteral administration. The most usual way is by the number of mg of drug per ml of liquid, i.e. mg/ml. The formula for making such calculations is thus: We want to give 30mg of a syrup containing 25mg in 5ml: To cancel a fraction, choose a number, which divides exactly into the top and the bottom. In this case, the number is 5: And 5 again: So, to give a patient 30mg, we must give 6ml. Concentration for some drugs will be quoted in millimoles per ml (mmol/ml) e.g. Potassium Chloride Injection contains 2 mmol Potassium per ml. Other drug concentrations will be measured in units per ml e.g. heparin, insulin. Calculations for these drugs are carried out in the same way as for mg per ml. Just make sure all units in the same equation match! Now try these examples: 11. Amitriptyline syrup 25mg in 5ml. Patient prescribed 20mg, How many ml? Colchester Hospital University NHS Foundation Trust Page 5 of 12

6 12. Pethidine injection 100mg in 2ml. Patient prescribed 75mg. How many ml? Gentamicin injection is 80mg in 2ml. Patient prescribed 20mg. How many ml? (ii) Percentage concentration Drug concentration may also be measured as percentage % (w/v). Percentage means the number of grams of drug dissolved in 100ml solution, i.e. g per 100ml. This is irrespective of the size of the vial or bottle of fluid: e.g. Dextrose 5% infusions means that there are 5 grams of Dextrose dissolved in each 100ml of fluid, and this will remain the same if we have a 500ml infusion bag or a 1 litre infusion bag. Thus, if we had to give a patient 25g of Dextrose, we would use the same formula as before: Therefore, we would have to give 500ml of fluid. Now try these examples: 14. Calcium Chloride 10% injection in a 10ml ampoule. How much is needed for a patient prescribed Colchester Hospital University NHS Foundation Trust Page 6 of 12

7 2g? Dextrose 50% injection in a 25ml vial. Patient prescribed 20g. How many ml? 15. (iii) One in.. concentration This final type of concentration method is used only occasionally, e.g. tuberculin, adrenaline. 1 is stated as 1 in 100, 1 in 10,000, etc, and means grams in ml. Thus: 1 in 100 means 1g in 100ml 1 in 1000 means 1g in 1000ml 1 in 10,000 means 1g in 10,000ml Therefore, it can be seen that 1 in 1000 is a WEAKER strength that 1 in 100, and 1 in 10,000 is WEAKER than 1 in We want to give 1mg tuberculin using 1 in 1000 strength solution. Now try these examples: 16. Give 1mg of epinephrine using the 1 in 10,000 solution. Colchester Hospital University NHS Foundation Trust Page 7 of 12

8 Give 5mg tuberculin using 1 in 100 solution. 17. E) Calculating the rate of infusion pumps An infusion my be prescribed as a total volume of fluid to run over a specified time in hours e.g. 1000ml Sodium Chloride 0.9% to be infused over 10 hours. Most infusion pumps are set in ml / hour, so you will need to establish what rate per hour is required. Total volume of fluid required Number of hours to be infused over = ml per hour required The prescription reads 1000ml of 5% Dextrose to be infused over 8 hours. At what rate should you set the pump? 1000 ml 8 hours = 125 ml/hr An infusion may also be prescribed as a dose in a given amount of fluid to run at x mg / hour e.g. 50mg Pethidine in 50mls of Sodium Chloride 0.9% to run at 4mg / hour. Most infusion pumps are set in ml / hour so you need to establish what rate is required. Dose of drug you want Dose of drug you ve got x Total volume of drug = ml per hour required The prescription reads 100mg of morphine in 50ml of water to run a 5mg / hour. At what rate should you set the pump? 5mg 100mg x 50mls = 2.5ml/hr Colchester Hospital University NHS Foundation Trust Page 8 of 12

9 Now try these examples: 18. The prescription reads 50 units of insulin in 50ml 0.9% sodium chloride to run at 2 units per hour. At what rate will you set the pump? 19. You have 50mg of GTN in 50ml total volume. You want to give 0.6mg/hr. At what rate will you set the pump? X 50 = 2ml / hour X 50 = 0.6ml / hour Ensure you translate both sides of the equation into the same units of measurement F) Calculations related to body weight A number of drugs such as Aminophylline are calculated according to patient s body weight. An infusion of Aminophylline is to run at 500mcg per kg per hour. The patient weighs 70kg. The drug is to be diluted in 1 litre of N/saline. The drug comes as 720mg. At what rate should the pump be set? Apply the formula: Dose of drug you want Dose of drug you ve got X Total volume of drug = ml per hour required Step 1 The dose we want is 500mcg/ kg / hour = 500 x 70 x 1 (Dose x weight x hour) Dose of drug you ve got = 35000mcg Step 2 The dose we have is 720mg or mcg Remember; translate both sides of the equation into the same units. Step mcg 1000ml X mcg (N/saline) So, to summaries your equation will look like this: = 48.6ml / hour Colchester Hospital University NHS Foundation Trust Page 9 of 12

10 500x70 x X 1000ml = 48.6ml / hour G) Further infusions rates, which are weight related A number of drugs such as inotropes, which may have a profound effect on the patient s cardiovascular status, are often prescribed in relation to body weight to prevent potential overdose. As a result, they are prescribed as: mcg per kg per minute (mcg / kg / min) An infusion of 200mg of dopamine in 50mls of 5% glucose is to run at 3mcg / kg / min. The patient weighs 80kg. At what rate should the pump be set? Apply the formula: Dose of drug you want Dose of drug you ve got X Total volume of drug = ml per hour required Step 1 The dose we want is 3mcg / kg / minute = 3 x 80 x 60 (Dose x weight x min) Dose of drug you have got = 14400mcg Step 2 The dose we have is 200mg or mcg Remember; translate both sides of the equation into the same units. Step mcg mcg X 50ml = 3.6ml / hour So, to summaries your equation will look like this: 3 x 80 x X 50 = 3.6ml / hour Now try these examples: Colchester Hospital University NHS Foundation Trust Page 10 of 12

11 Question 20. A 60kg patient is to have 10mcg / kg / min of Dobutamine. Dobutamine is prescribed as 250mg in 250ml. At what rate will you set the pump? 21. A 80kg man is prescribed 3mcg / kg / min of Dopamine. The Dopamine is to be made up as 800mg in 500ml. At what rate will you set the pump? x60x x80x Answer X 250 = 36ml / hour X 500 = 9ml / hour Remember: Ensure you translate both sides of the equation into the same units of measurement (I) The Drug Calculation Test Paper This consists of 10 questions, which you are required to answer within half an hour. Four questions have been listed below to help prepare you for the format of the test paper. These are just examples of questions you may come across in the test paper. 1. A patient is prescribed 250mcg of digoxin. The ampoule contains 500mcg in 2ml. What volume is needed to achieve the correct dose? 2. A patient is prescribed 24,000 units of heparin. The ampoule contains units in 10ml. How many ml do you need? 3. A patient is prescribed IV Dextrose Saline 1000ml over 12 hours. At what infusion rate in ml/hour should the infusion pump be set? 4. An 80kg patient is to have 5mcg/kg/min of dobutamine. The dobutamine is prescribed as 250mg in 250mls of 5% dextrose. At what infusion rate in ml/hour should the infusion pump be set? ml 2. 24ml ml/hr 5. 24ml/hr Colchester Hospital University NHS Foundation Trust Page 11 of 12

12 Colchester Hospital University NHS Foundation Trust Page 12 of 12

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