Drug Calculations Conversion Chart
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5APPENDIX D
APPENDIX D
drug calculations
Read the following information carefully before attempting the examples and exercises.
TABLETS
Formula method
Required dose
= No. of tablets to be given
Stock dose
Ratio method
Required dose : Required tablet
Stock dose : Stock tablet
Required dose
Required tablet
=
Stock dose
Stock tablet
Note: Units for the required dose and stock dose must be the same. The stock dose is the mass
you have available to you. The required dose is the mass that needs to be given to the client.
E X A M P L E
A client is ordered 150 mg soluble aspirin. ‘Disprin’ tablets containing 300 mg aspirin are
available. How many tablets will you give?
Formula method
Ratio method
× tablet
150mg
150mg :
= No. of tablets to be given
300mg :
1 tablet
300mg
× tablet
150mg
= 0.5 tablet
=
300mg
1 tablet
= 0.5 tablet
DRIP RATES
Total volume
mL
=
Total hours
hr
Drops per minute (dpm)
Macro drip
Volume
Drop factor (20)
×
dpm
=
Time (hr)
60 min
Micro drip
Volume
Drop factor (60)
×
dpm
=
Time (hr)
60 min
Note: Drop factor for macro drip = 20 drops/mL; micro drip = 60 drops/mL.
APPENDIX D
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