[PDF] Drug Calculations Prepared by: Janet Tweedy and





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Drug Calculations

It's OK to use a calculator! 1. A patient requires 4 mg of Morphine IVI. Morphine is available as. 10mg/ml. How many mls will you draw up 



Drug Dosage & IV Rates Calculations

formula and simplify. x 1 = 2 tablets. Therefore the nurse should give 2 tablets. The same formula can be used for dosage calculations where the medication is.



Common Drug Calculations Common Drug Calculations

2 Feb 2023 Two dosage calculation techniques are presented below: traditional formulas and dimensional analysis. Nurses should select one formula and ...



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How many mLs should you draw up to give this dose? 6. A patient weighing 60 kg is prescribed intravenous dopamine 4 micrograms/kg/minute. Calculate 



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Drug calculations part 1: a critique of the formula used by nurses. Nursing paediatric-formulary-9th-edition.pdf. Your local hospital pharmacy department ...



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• Identify what type of drug calculation and as a first step use common sense to estimate a rough • After applying the formula (if relevant)



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The formula to calculate the concentrations of drug per ml. Amount of Drug (2005) 'Paediatric Nursing Calculation Skills'(online): http://hy.health.gov.il ...



LET - Maths Stats & Numeracy

2) A male patient weighs 90 kg and has been prescribed 1.5 mg/kg/dose of drug. X To calculate the time an infusion will run for



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This site has nursing calculation quizzes with answers that you can access Drug Calculations Practice 2 - Answers. 1) 0.27 mg. 2) 7600 mg. 3). 3 ml. 4). 0.8 ...



drug calculations for Registered Nurses

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:.



Drug Dosage & IV Rates Calculations

formula and simplify. x 1 = 2 tablets. Therefore the nurse should give 2 tablets. The same formula can be used for dosage calculations where the medication 



Drug Calculations

Prepared by: Janet Tweedy and Deb Mason Nurse Educators



drug-calculations-for-nurses-4th-ed-2016.pdf

In current nursing practice the need to calculate drug dosages is not uncommon. These calculations have to be performed competently and.



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Remember that for intravenous infusion sometimes you are asked to calculate volume



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Drug Calculations Workbook

Drug Calculations Workbook. Registered nurses & Operating department practitioners The formula to calculate the concentrations of drug per ml.



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13 May 2015 medication error. 3Conceptual difficulties and poor numeracy skills can cause nurses to calculate dosages wrongly. 4Drug calculation.

C:\Documents and Settings\neilh\Local Settings\Temporary Internet Files\Content.Outlook\BA80LT24\Clinical calcs REVIEW

SESSION.doc

Prepared by: Janet Tweedy and Deb Mason, Nurse Educators, Department of Nursing, Christchurch Hospital, May 2000.

Canterbury Health Ltd.

Last updated June 2000.

1

DRUG CALCULATIONS

When calculating how much of a drug is required, working with the formula helps the accuracy of the calculation.

Always remember this formula:

What you want X Quantity it comes in

What you have 1

to use a calculator!

1. A patient requires 4 mg of Morphine IVI. Morphine is available as

10mg/ml. How many mls will you draw up?

2. Gentamycin 360 mg is prescribed. Gentamycin is available as

80mg/2ml. How many mls will you draw up?

3. Haloperidol 3 mg IVI is charted. Haloperidol is available as 5mg/ml.

How many mls is required?

4. Frusemide 70mg IVI is charted. Stock dose is 20mg/ml. How many ml

would you give?

C:\Documents and Settings\neilh\Local Settings\Temporary Internet Files\Content.Outlook\BA80LT24\Clinical calcs REVIEW

SESSION.doc

Prepared by: Janet Tweedy and Deb Mason, Nurse Educators, Department of Nursing, Christchurch Hospital, May 2000.

Canterbury Health Ltd.

Last updated June 2000.

2

METRIC CONVERSIONS

Metric weights and measurements involve a step-by-step conversion from one unit to another. With weight we often convert to smaller (and more numerous units) thus:

Kg gm mg mcg

grams milligrams micrograms Each of these steps involves the heavier unit being multiplied by 1000 to bring up the number of the smaller units for the same weight. kg g 1kg x 1000 = 1000g g mg 1g x 1000 = 1000mg mg mcg 1mg x 1000 = 1000mcg the right

0.5g == ?? mg 0.5 x 1000 == 500mg

1 place = 5

2 places = 50

3 places = 500

If we are converting from a lighter unit to a heavier unit we move the decimal point three places to the left for each conversion. Another way of putting it is we divide by 1000. mcg mg 1000mcg

1000 = 1mg

mg gm 1000mg

1000 = 1gm

gm kg 1000gm

1000 = 1kg

500mg = ?? gm 500

1000 = 0.5mg

1 place = 50

2 places = 5

3 places = 0.5

C:\Documents and Settings\neilh\Local Settings\Temporary Internet Files\Content.Outlook\BA80LT24\Clinical calcs REVIEW

SESSION.doc

Prepared by: Janet Tweedy and Deb Mason, Nurse Educators, Department of Nursing, Christchurch Hospital, May 2000.

Canterbury Health Ltd.

Last updated June 2000.

3

Memory Tip:

Try these:

5. Atropine 0.6 mg = ?mcg

0.6 x 1000 = 600mcg

6. 0.01gm = ? mg

0.01 x 1000 = 10 mg

7. Gentamycin 360mg = ?gm

360

1000 = 0.36gm

8. Digoxin 125mcg = ? mg

125

1000 = 0.125mg

If we are moving across two conversions we repeat the process twice.

For example from grams to micrograms:

3gm converted to micrograms

Step one:

= 3 x 1000 = 3000mg

Step two:

3000mg x 1000 = 3,000,000mcg

9. Augmentin 1.2gm = ?mcg

1.2 x 1000 = 1200mg

1200 x 1000 = 1,200,000mcg

10. Digoxin 125mcg = ? gm

125

1000 = 0.125mg

0.125

1000 = 0.000125gm

C:\Documents and Settings\neilh\Local Settings\Temporary Internet Files\Content.Outlook\BA80LT24\Clinical calcs REVIEW

SESSION.doc

Prepared by: Janet Tweedy and Deb Mason, Nurse Educators, Department of Nursing, Christchurch Hospital, May 2000.

Canterbury Health Ltd.

Last updated June 2000.

4

Try these:

Convert

11. 1.2 mg to mcg

12. 1.3g to mg

13. 500mcg to mg

14. 0.04 mg to mcg

15. 20mcg to mg

16. 600mcg to g

17. 2g to mcg

When we are converting volumes the process is the same.

Litres

ml

1 Litre

1000ml

0.25L 250ml
375ml

0.375L

Try these:

Convert

18. 450ml to L

19. 64 ml to L

20. 4.3L to ml

C:\Documents and Settings\neilh\Local Settings\Temporary Internet Files\Content.Outlook\BA80LT24\Clinical calcs REVIEW

SESSION.doc

Prepared by: Janet Tweedy and Deb Mason, Nurse Educators, Department of Nursing, Christchurch Hospital, May 2000.

Canterbury Health Ltd.

Last updated June 2000.

5

MG/KG DOSE CONVERSION

Often we need to check the dose of a drug or solution that is based We multiply the prescribed mg dose by the kg weight of the patient

Prescribed dose - 25mg per kg

- 66kg

What is the dose required?

25mg x 66kg = 1650mg

= 1.65g

21. Prescribed dose 50 mg/kg

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