Dosage Calculations "D" correct answers desired or order
Dosage Calculations "H" correct answers on hand or have (strength of drug)
Dosage Calculations "s" correct answers supply or stock (unit form in which the drug comes)
A or X correct answers answer or amount: how much supply to give
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Med Math Quiz 2 || with 100% Error-free Answers.
Dosage Calculations "D" correct answers desired or order
Dosage Calculations "H" correct answers on hand or have (strength of drug)
Dosage Calculations "s" correct answers supply or stock (unit form in which the drug comes)
A or X correct answers answer or amount: how much supply to give
Ratio method correct answers Supply: Have:: x: Desire; how drug supplied: what is on hand ::
unknown quantity : desired or ordered amount
Example of ratio method:
Order: sumycin 500 mg PO q6
Supply: capsules of 250 mg
What is quantity to administer correct answers S:H : : X:D
1 capsule: 250 mg :: x: 500 mg
250mg(x) = 500 mg/capsule
x = 2 capsules
Proportion method correct answers supply x
------- = -------
have desire
First fraction is known equivalent (supply form/what on hand), second is unknown/desired
amount, cross multiply and solve for X
Ex proportion method:
Order: Inderal 0.02 g PO q6
Supply: scored tablets of 0.01 g
What is quantity to give correct answers 1 tab X
---- = -----
0.01g 0.02g
0.01 g (X) = 0.02 g/tablet
X = two tablets
Formula method correct answers Desire/Have x Supply = Amount of Answer
Ex of formula method
Order: Lanoxin 0.125 mg PO daily
Supply: scored tablets of 0.25 mg
What is quantity to administer correct answers (0.125 mg)/(0.25 mg) X 1 tablet
A = 1/2 tablet
Measurements for formula method correct answers order and supply must be in same weight
measure
, 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 (Tylenol, Advil)
Example oral liquid med
Order: 5 mg PO
Supply: 10 mg per 4 mL correct answers 5mg/10mg X4mL =A
A = 2mL
The client is to receive acetaminophen 975 mg po every 6 hours prn for an earache. You have
325mg tablets available. How many tablets would the nurse administer?
A. 2 tablets
B. 3 tablets
C. 4 tablets
D. 5 tablets correct answers 975 mg/325 mg X 1 tablet = 3 tablets
The patient/client is to receive Mycostatin oral suspension 200,000 units po twice a day. The
available Mycostatin oral suspension is 100,000 units per milliliter. How many milliliters of
medication would the nurse administer?
A. 1 mL
B. 2 mL
C. 3 mL
D. 4 mL correct answers 200,000 units/100,000 units X mL = 2 mL
Liquid injection meds example
order: Cefaclor 2g PO in 2 doses
Available: Cefaclor suspension 375 mg/5mL
How much do you give per dose? correct answers 2 g = 2000 mg
2000 mg/375 mg X 5 mL
5.33 X 5 mL = 26.65 mL divided by 2 doses is 13.3 mL
3mL syringe injection problems correct answers carry out arithmetic to hundredths place and
then round off to the nearest tenth
1mL syringe injection problems correct answers Carry out arithmetic to thousandths place and
then round off to nearest hundredth
When stock is a ratio correct answers labels may state the strength of a drug as a ratio, example:
adrenalin 1:1000; interpret 1g of the drug in 1000 mL
When stock is a percent correct answers Labels may state the strength of the drug as a percent.
Example: Lidocaine 2%; interpret, 2g of the drug in 100 mL
Reconstitution of powders:
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