Calculating Tablets
How much tablets should I give?
Formula: Dose to be given
---------------------------- = Number of tablets
Stock strength / Stock dose
- Dose to be given = amount of tablets you need …e.g. doctor prescribed 1g of the tablet to be administered.
- Stock strength / Stock dose = strength of one tablet …e.g. each tablet contains 500mg of the drug.
- Convert to same unit of weight… 1g = 1000mg
- Calculate ! 1000mg ÷ 500mg = 2 tablets
Calculating Mixtures, Solutions, Fluid for injection
How much medication should I give?
Formula:
Dose to be given Stock Volume
---------------------------- X --------------- = Amount of solution to be given
Stock strength / Stock dose 1
- Dose to be given = amount of medication you need …e.g. doctor prescribed 2g to be administered.
- Check the “strength per volume” of the medication …e.g. 500mg/10mls
- Stock strength / Stock dose = strength of the medication …500mg
- Stock volume = the amount of medication containing that strength …10mls
- Convert to same unit of weight… 2g = 2000mg
- Calculate! (2000mg ÷ 500mg) X (10mls)
- = 4 X 10
- = 40mls
Calculating IV rates: mls per hours (& minute)
How many mls per hour do I set?
Formula for hours: Total volume to be given (mls)
--------------------------------- = mls per hour
Time (hours)
E.g. 1200mls ÷ 10hrs = 120mls/hr
Formula for minutes: Total volume to be given (mls)
--------------------------------- = mls per minute
Time (hours) X 60
E.g. 1200mls ÷ (10hrs X 60)
=1200mls ÷ 600
=2mls/min
Calculating IV rates: drops per minute (dpm)
How many drops of medication are given per minute?
Formula:
Total volume to be given (mls) Drop factor
------------------------------- X ------------ = mls per hour
Time (mins) 1
Calculating IV rates: time remaining
How much time is remaining in this infusion?
Formula:
Volume remaining in the bag (mls) Drop factor
---------------------------------- X ------------ = mls per hour
Drops per minute (mls/hr) 1*See administration set, usually 15, 20, 60 drops/ml
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