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Pharmaceutical Calculations

This document contains 12 pharmaceutical calculations questions regarding: 1) Calculating the mass of drug in a child's dose of cough syrup 2) Calculating the final concentration after dilution of a stock solution 3) Calculating quantities needed to prepare 100g of a compound

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Von Valentine Mhute
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636 views2 pages

Pharmaceutical Calculations

This document contains 12 pharmaceutical calculations questions regarding: 1) Calculating the mass of drug in a child's dose of cough syrup 2) Calculating the final concentration after dilution of a stock solution 3) Calculating quantities needed to prepare 100g of a compound

Uploaded by

Von Valentine Mhute
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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MINISTRY OF HIGHER AND TERTIARY EDUCATION, SCIENCE

AND TECHNOLOGY DEVELOPMENT


NATIONAL CERTIFICATE IN PHARMACEUTICAL TECHNOLOGY
PHARMACEUTICAL CALCULATIONS ASSIGNMENT 1
FEBRUARY 2020
1. If 240 mL of a cough syrup contains 480 mg of dextromethorphan hydrobromide, then what
mass of drug is contained in a child's dose, 1 teaspoonful (5 mL) of syrup?
2. If 120 mL of a 10% stock solution is diluted to 240 mL, what is the final concentration? Using
inverse proportion
3. What quantities should be used to prepare 100 g of camphorated parachlorophenol?

Rx parachlorophenol 7 parts

camphor 13 parts

7 parts + 13 parts = 20 parts total

4. What mass of each ingredient is required to provide 1 pound (AV) of cream?

Rx white wax 12.5 g

mineral oil 60.0 g

lanolin 2.5 g

sodium borate 1.0 g

rose water 24.0 g

1 lb = 454 g

5. Express 0.1% w/v as a ratio strength


6. Express 1:2500 as a percentage strength
7. How many milliliters of a 1:50 stock solution of ephedrine sulfate should be used in
compounding the following prescription?

Rx ephedrine sulphate 0.25%

rose water ad 30 mL

8. How many chloramphenicol capsules, each containing 250 mg, are needed to provide 25 mg
per kg per day for 7 days for a person weighing 200 lb?
9. From the following formula, calculate the amount of white wax required to make 1 lb of cold
cream. Determine the mass in grams.

Cetyl esters wax 12.5 parts

White wax 12.0 parts

Mineral oil 56.0 parts

Sodium borate 0.5 parts

Purified water 19.0 parts

10. The atropine sulfate is available only in the form of 1/150 gr tablets. How many atropine
sulfate tablets would you use to compound the following prescription? (p40)

Atropine sulfate 1/200 gr

Codeine phosphate 1/4 gr

Aspirin 5 gr

d.t.d. #24 capsules

Sig: 1 capsule p.r.n.

11. The formula for Ringer's solution follows. How much sodium chloride is needed to make 120
mL? (42)

Rx sodium chloride 8.60 g

potassium chloride 0.30 g

calcium chloride 0.33 g

water for injection, qs ad 1000 mL

12. How many milliliters of a 1:1500 solution can be made by dissolving 4.8 g of cetylpyridinium
chloride in water?

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