calculations of oral meds correct answers solids and liquids
Dosage calculations correct answers D= desired dose or order
H= on hand or have (strength of drug)
S= supply or stock (unit form in which the drug comes)
A or X= answer or amount. how much supply to give
four methods of dosage ca...
Med Math Quiz 2 || with Accurate Answers 100%.
calculations of oral meds correct answers solids and liquids
Dosage calculations correct answers D= desired dose or order
H= on hand or have (strength of drug)
S= supply or stock (unit form in which the drug comes)
A or X= answer or amount. how much supply to give
four methods of dosage calculation correct answers proportion expressed as two fractions
proportion expressed as two ratios
formula method
dimensional analysis
proportion: expressed as two rations (ratio method) correct answers supply : have :: x : desired
how drug is supplied : what is on hand
unknown quantity : desired or ordered amount
solve for x
example of ratio method correct answers Order: Sumycin 500 mg PO q6h
Supply: capsules of 250 mg
What is the quantity to administer?
S:H :: X:D
1 capsule: 250 mg :: X : 500 mg
(Multiple the means and the extremes)
250mg X = 500 mg/capsule
X = 2 capules
proportion expressed as two fractions (proportion method) correct answers supple/have
=x/desired
First Fraction is the known equivalent
Supply form / what is on hand
Second Fraction is the unknown/ desired amount
Solve for X (cross multiply)
example of proportion method correct answers Order: Inderal 0.02 g PO q6h
Supply: scored tablets of 0.01 g
What is the quantity to administer?
i tablet/ 0.01 g = x/0.02 g
0.01 g X = 0.02g/tablet
X = 2 tablets
formula method correct answers desired/have (supply) = x
, example of formula method correct answers Order: Lanoxin 0.125 mg PO daily
Supply: scored tablets of 0.25 mg
What is the quantity to administer?
D/H (S) = x
0.125mg/0.25mg (1 tablet) = x
x= 1/2 tablet or 0.5 tablet
Before solving problems, check to be certain that the order and supply are in the same weight
measure correct answers If not in the same weight measure, you must convert one or the other to
its equivalent
example of converting equivalents (formula method) correct answers Order: Vasotec 500 mcg
PO daily
Supply: Scored tablets 1 mg
What is the quantity to administer?
Order 500 mcg
Supply 1 mg tablet
1 mg = 1000 mcg or 500 mcg = 0.5 mg
You may convert either way, whichever way you are more comfortable with
500mcg/ 1000mcg (1 tablet) =1/2 tablet or 0.5
example: Order: Dilantin extended release 60 mg for a patient who had a seizure. How much will
you administer? correct answers 60mg/30mg (1 tablet) = 2 tablets
example: Order: Levaquin 0.5 g po daily for a patient with an infection. How much will you
give? correct answers 0.5g =500mg
500mg/250mg (1 tablet) = 2 tablets
Special Types of Oral or Solid Orders correct answers Drugs with more than one active
ingredient are usually ordered by the number to be administered
No calculations necessary
Over the counter medications are often ordered in this manner
Aggrenox contains 25 mg of aspirin and 200 mg of dipyridamole
Order: give 1 capsule PO bid
Oral Liquids correct answers Use ratio, proportion or formula method
Supply and stock will be in a liquid amount
Measuring Oral Liquids correct answers Oral liquids are measure using a medication cup,
calibrated dropper or needleless syringe
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