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pharm math
•IV flow rate---speed at which IV solution is
delivered, volume per time , in mL
•flow rate= volume/time
•1L of IV solution over 3 hours. what is flow rate?
•1000ml/3hrs=333ml/hr
•also this means---time=vol / flow rate
•how many hours should 1L of D5W last if run
125ml/hr?----time= 1000ml/125ml=8hrs
•also means---vol=flowrate x time----ml needed
for IV fluid 60ml/hr for 12hr?
•60mlx12hr=720ml
alligations
what?? mixing 2 drugs to get what dr wants.
dr wants 30g of 15% hydrocortisone cream. we only have 20%
and 2% hc cream. what to do ?? alligation
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pharm math
• IV drop devise is manual or electronic. manual
control has IV administration setting drops per
min. the turn restricting knob.
• pt needs D5W at rate 125ml/hr. The admin set
does 10ggt/ml. how many gtt.min should we
use?
• 125ml/60min= 10drops every ml=1250drops in
60min=21drops/min
• 300ml of D5W given at 75ml/hr. admin set does
10gtt/ml. setting for gtt/min?
• 75ml/60minx10drops/ml=750drop/60min=13gtt/m
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pharm math
• dose per unit time
• 250mg drug A is diluted to 500ml with NS. drug
order is 250mg at rate 50mg/hour. amdin set is
15gtt/ml. calculate rate in ml/min and gtt/min.
• 500ml/250mg=xml/50mg=x=25000/250=100ml
• 100ml/hour=1.67ml/min
• 1.67ml/minx 15gtt/ml=25gtt/min
rx is 60ml morphine sulfate. pharm has 20mg per 5ml.
how many mg morphine in the 60ml bottle?
20mg/5ml= x mg/60ml
1200/5=x mg
x=240mg morphine sulfate in bottle
560g is how many kg?
1000g/1kg= 560g/x kg
1000x=560g
x=560/1000
x=.56kg
how many ml in 4 fl oz?
30ml/1 fl oz= x ml/4 fl oz
x= 120ml
Temp ranges-----------------Frozen= below 0 c
Refrigerated= 0 to 5c
Controlled= 15-25c
Warm room= 30-35c
Extreme heat=over 35c