## Wednesday, December 30, 2015

### Dosage Calculation - Mass/Liquid For Liquid Questions - (2)

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Mass/Liquid For Liquid Questions
Given an amount of mass per liquid, how much liquid do you require?

Formula:

$\overline{)\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}}$

Question (3): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug D 60 mg P.O.
AVAILABLE: Drug D 15 mg per mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{60 mg}}}{{\mathbf{15 mg}}}x{\mathbf{1 mL}}=\overline{){\mathbf{4 mL}}}$
Alternatively, 15 mg = 1 mL
Therefore 60 mg = 1/15 x 60 = 4 mL

Question (4): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug E 0.6 g P.O.
AVAILABLE: Drug E 400 mg per 2 mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
Convert 0.1 g to mg.
mcg ← mg ← g ← kg    ( x by 1,000 )
0.6 g x 1,000 = 600 mg

$\frac{{\mathbf{600 mg}}}{{\mathbf{400 mg}}}x{\mathbf{2 mL}}=\overline{){\mathbf{3 mL}}}$
Alternatively, 400 mg = 2 mL
Therefore 600 mg = 2/400 x 600 = 3 mL

Question (5): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug F 45 mg I.M.
AVAILABLE: Drug F 50 mg in 2 mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{45 mg}}}{{\mathbf{50 mg}}}x{\mathbf{2 mL}}=\overline{){\mathbf{1.8 mL}}}$
Alternatively, 50 mg = 2 mL
Therefore 45 mg = 2/50 x 45 = 1.8 mL

Question (9): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug M 35 mg I.M.
AVAILABLE: Drug M 50 mg per mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{35 mg}}}{{\mathbf{50 mg}}}x{\mathbf{1 mL}}=\overline{){\mathbf{0.7 mL}}}$
Alternatively, 50 mg = 1 mL
Therefore 35 mg = 1/50 x 35 = 0.7 mL

Question (11): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
The doctor prescribed Tagamet 400 milligrams orally. The Tagamet label reads Tagamet liquid 200 milligrams in 5 milliliters. How many mls will be given?

$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{400 mg}}}{{\mathbf{200 mg}}}x{\mathbf{5 mL}}=\overline{){\mathbf{10 mL}}}$
Alternatively, 200 mg = 5 mL
Therefore 400 mg = 5/200 x 400 = 10 mL

Question (12): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug Q 300,000 units I.M.
AVAILABLE: Drug Q 5,000,000 units in 25 mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{300,000 units}}}{{\mathbf{5,000,000 units}}}x{\mathbf{25 mL}}=\overline{){\mathbf{1.5 mL}}}$
Alternatively, 5,000,000 units = 25 mL
Therefore 300,000 units = 25/5,000,000 x 300,000 = 1.5 mL

Question (14): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug T 50 mg P.O.
AVAILABLE: Drug T 25 mg per 4 mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
$\frac{{\mathbf{50 mg}}}{{\mathbf{25 mg}}}x{\mathbf{4 mL}}=\overline{){\mathbf{8 mL}}}$
Alternatively, 25 mg = 4 mL
Therefore 50 mg = 4/25 x 50 = 8 mL

Question (15): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug U 0.4 g I.M.
AVAILABLE: Drug U 500 mg in 2 mL

${\mathbf{\text{GIVE:}}}\overline{)\phantom{\rule{30pt}{12pt}}}{\mathbf{\text{mL}}}$
$\frac{{\mathbf{Ordered}}}{{\mathbf{Have}}}x{\mathbf{Volume Per Have}}={\mathbf{Y\left(Liquid required\right)}}$
Convert 0.1 g to mg.
mcg ← mg ← g ← kg    ( x by 1,000 )
0.1 g x 1,000 = 100 mg
0.4 g = 0.4 g x 1000 = 400 mg

$\frac{{\mathbf{400 mg}}}{{\mathbf{500 mg}}}x{\mathbf{2 mL}}=\overline{){\mathbf{1.6 mL}}}$
Alternatively, 500 mg = 2 mL
Therefore 400 mg = 2/500 x 400 = 1.6 mL

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