Sherpath - Methods of Calculating Dosages
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| What are the 3 main methods of medication dosages? | show 🗑
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| show | (D/H) x Q = X
D = desired dose (amount of meds ordered)
H = dosage supply on hand
Q = refers to the quantity to be administered
X = refers to the dose to be administered
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| show | H : V (known) = D : X (desired)
H = dosage or supply on hand
V = indicates the vehicle
D = reflects the desired dosage
X = denotes the amount to be given
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| Ratio and Proportion method continued (solid oral medication) | show 🗑
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| show | H= 4mg, V= 1mL, D= 2mg, X= amount to administer
4 : 1 :: 2 : x (multiply means and extremes)
4x :: 2
x :: 1/5
0.5 mL administered to patient
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| Ratio and Proportion method continued (Liquid Oral Medication) | show 🗑
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| Dimensional Analysis and Factor Labeling relies on 3 factors to calculate dosages: | show 🗑
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| show | X = V/H (drug label) x C(H)/C(D) (conversion factor) x D/1 (drug order)
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| Dimensional Analysis without using conversion factor | show 🗑
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| show | D= 0.5g, H= 250mg, V= 1 tab, C= 1000mg/1g
X(tabs) = 1cap/250mg x 1000mg/1g x 0.5g/1
X(tabs) = 0.004 x 1000 x 0.5
X = 2
2 tablets to be administered
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| Dimensional Analysis using a conversion factor (IV medication) | show 🗑
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| show | Answer 20.
H= 250mg, V= 5mL, D= 1g, C= 1000mg/1g
X= 5mL/250mg x 1000mg/1g
X= 0.02 x 1000
X= 20
20mL to be given to patient
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| show | x
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