Dosage Calculation - Mass for Mass Questions - (2)

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Mass for Mass Questions
Given an amount of mass per tablet, how many tablets do you require?

Formula:

$$\boxed{\frac{\mathbf{Ordered}}{\mathbf{Have}}=\mathbf{Y(Tablets\; required)}}$$

Question (7): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
The doctor orders 40 mg of Feldene per day. Feldene comes in 10 mg capsules. The patients should take the medication before breakfast and dinner. How many capsules should the patient take before each meal?

2 meals = 40 mg
Therefore, 1 meal = 40/2 = 20 mg

$$\frac{\mathbf{Ordered}}{\mathbf{Have}}=\mathbf{Y(Capsules\; required)}$$

$$\frac{\mathbf{20\; mg}}{\mathbf{10\; mg}}=\boxed{\mathbf{2\; Capsules\; before\; each\; meal}}$$

Question (8): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
Drug A label reads 50 mg tablets. The doctor orders 75 mg tds. The nurse will administer __________ tablets/each time for 3 times a day.

3 times a day = 75 mg
Therefore each time = 75/3 = 25 mg

$$\frac{\mathbf{Ordered}}{\mathbf{Have}}=\mathbf{Y(Tablets\; required)}$$

$$\frac{\mathbf{25\; mg}}{\mathbf{50\; mg}}=\boxed{\frac{\mathbf{1}}{\mathbf{2}}\mathbf{tablets\; each\; time}}$$

Question (13): (From Ngee Ann Polytechnics Dosage Calculation Worksheet)
ORDER: Drug S 0.15 mg P.O.
AVAILABLE: Drug S 0.3 mg tablets

$$\mathbf{\text{GIVE:}}\underline{}\mathbf{\text{Tab(s)}}$$

$$\frac{\mathbf{Ordered}}{\mathbf{Have}}=\mathbf{Y(Tablets\; required)}$$

$$\frac{\mathbf{0.15\; mg}}{\mathbf{0.3\; mg}}=\boxed{\frac{\mathbf{1}}{\mathbf{2}}\mathbf{tablets}}$$

Alternatively, 0.3 mg = 1 tablet
Therefore 0.15 mg = 1/0.3 x 0.15 = 0.5 tablets

Continue (Go to Dosage By Weight Questions)



Reference

[1] Advanced Formatting, Ry’s MathML Tutorial, http://rypress.com/tutorials/mathml/advanced-formatting.
[2] MathML, Presentation MathML, https://en.wikipedia.org/wiki/MathML.
[3] MathJax in Blogger (II), Posted on Tuesday, 12 July 2011, http://irrep.blogspot.sg/2011/07/mathjax-in-blogger-ii.html
[4] MathJax, http://docs.mathjax.org/en/latest/start.html

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