# pharm math

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## pharm math

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1. 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

2. pharm math • IV drop device 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 x 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/min

3. pharm math • dose per unit time • 250mg drug A is diluted to 500ml with NS. drug order is 250mg at rate 50mg/hour. admin 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

4. 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

5. 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 show tic-tac-- book

6. Temp ranges------------------ Frozen= below 0 c Refrigerated= 0 to 5c Controlled= 15-25c Warm room= 30-35c Extreme heat=over 35c