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Pharmacy tech. Formulas
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Gravity
Terms in this set (26)
D/H × V= X
Dosage formula for oral liquids
High conc #....... [low con. -desired]
------Desired conc
Low conc #........[ high conc. - desired]
Alligation set up
High conc.= # parts/ total # parts × desired ounces
Low conc.= # parts/ total parts desired × desired ounces
Alligation calculation
Units:ml::units:ml
Heparin and insulin dosage formula
Total amounts ordered/total # of hours
Flow rate formula for pump
V (total volume to be infused in ml) /T (total time in min) × C (drip factor in gtt/ml) = R (rate of flow in gtt/min)
Formula for flow rate, no pump, definitions
V/T × C = R
Formula for flow rate no pump, no definitions
D (desired dosage) / H (dosage in stock) × V (volume of drug) = X
Dosing for oral liquids definitions
Weight of child (lbs)/150 × average adult dose = child's dose
Clark's rule
Age of child (yrs) / age of child (yrs) + 12 × average adult dose = childs dose
Young's rule
Childs age (months)/150 × average adult dose = child's dose
Frieds rule
C° × 1.8 +32 = F°
Temperature conversion formula
example: the physician orders 100 mg of drug with dosage strength of 125mg/5 ml what would be he dose?
100mg/125mg x 5ml= 4 ml
example: physician orders 100 mg of drug, the pharmacy has 250 mg/ 5 ml what would be the dose?
100mg/250 mg x 5 ml =2ml
example: the physician orders to prepare 5 oz of 15% solution using 30% solution and 10% solution, how much of each solution should be used
high conc 30%................[10-15]=5 parts
desired conc 5oz of 15 %
low conc 10%.................[30-15]=15 parts
High con= 5/20* 5=1.25 oz
low conc=15/20*5=3.75 oz
example: physician orders given for 60 mg IM the pharmacy only has a dosage of 80mg/2ml in a vial. how much drug should be given from the vial?
60mg/80mg * 2ml=1.5 ml
(d/h*v=x)
example: physician orders .2mg SC stat, the pharmacy only has 400mcg/ml. how much should be given
(400mcg)(1mg/1000mcg)= .4mg/ml
.2mg/.4mg * 1 ml= .5 ml
example: a patient is given instructions to take 40 units of insulin using 100 unit insulin and a tuberculin syringe, how many ml will be taken
40/100*1ml=.4 ml
example: a physician orders 7500 units SC, heparin is available in 10000 units/ml. how many ml will be taken
7500/10000* 1ml=.75
example: a vial of powdered penicillin contains 1,000,000units. the amount diluent to be added to obtain a solution containing 100,000u/ ml?
1,000,000 u:x::100,000 u:1ml
100,000u x=1,000,000u/ml
x=10ml
example: physician orders 500ml of antibiotic to be infused over 2 hr, what will be the flow rate. if you have a pump present?
500ml/ 2hr= 250 ml/hr
example: calculate the flow rate for a 500mg of IV in a 100 ml bag to be infused over 30 min
(30min)(1hr/ 60 min)= .5
100ml/ (.5)= 200
example: physician orders 200cc of a drug to be infused over 2 hrs, how many drops/min are needed so that all 200cc is infused, drip factor is 20 gtts/min
1cc=1ml
200cc=200ml
(2hr)(60min/ 1hr)=120 min
200ml/120 min *20 gtts/min=33.3 gtt/ min
example: find dose of cortisone for 30 lb infant, adult dose is 100 mg
30 lb/ 150 * 100mg =20 mg
example: the dose of acetaminophen for 4 yr old, adult dose is 1000 mg
4 yrs/ 4+12 * 1000 mg= 250 mg
example: amoxil 25 mg/ kg /day given every 12 hours to 24 lb infant. amoxil is available in 250 mg/ 5ml dose. what is the infant dose
(24 lb)(1kg/2.2 lb)=11 kg
11kg * 25mg/kg/day=275 mg/ 24 hr
(12 hr)(275 mg/24 hr)=137.5 mg. dose
137.5 mg/ 250 mg * 5 ml= 2.75 ml
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