Example 1 Calculate the amount of each ingredient required for 1225mL of the formula listed below AT A GLANCE PHARMACY CALCULATIONS FORMULATIONS Ingredient Master formula Substance A 175g Substance B ID: 674096
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Slide1
Calculating the quantity of each ingredient required to produce a different quantity of a master formula.
Example 1
Calculate the amount of each ingredient required for 1225mL of the formula listed below.
AT A GLANCE/PHARMACY CALCULATIONSFORMULATIONS
Ingredient
Master formulaSubstance A175gSubstance B50gSubstance C12% v/vSubstance D75gSubstance E1 in 2000 w/vWater to:350mL
Method
Step 1: Divide the amount you wish to make by the amount the formula is for
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Acknowledgments
All materials checked by Dr Scott Wildman, Dr Cleopatra Branch, Jerome Durodie and Andrew Lea, Medway School of
Pharmacy, Anson Building, Central Avenue, Chatham Maritime, Chatham, Kent. ME4 4TB.This leaflet has been produced in conjunction with sigma Mathematics Support Centre Slide2
Step 2:
Use this factor to calculate the amount of all the volumetric ingredients
Step 3:
Calculate the amounts of the % and parts ingredients
Q1
Calculate the amount of each ingredient required for 765mL of the formula listed below
Ingredient
Master formula
Substance A
16gSubstance B25gSubstance C4% w/vSubstance D70mLSubstance E
0.05% w/v
Water to:
170mL
Q2
Calculate the amount of each ingredient required for 1.5L of the formula listed below
IngredientMaster formula
Substance A20mgSubstance B
10g
Substance C
2% v/v
Substance D
7.5mL
Substance E
0.02% w/v
Water to:
50mL
Q3
Calculate the amount of each ingredient required for 2400mL of the formula listed below
Ingredients
Master formula
Substance A
268g
Substance B
150g
Substance C
0.01% w/v
Substance D12mLSubstance E0.5% w/vWater to:500mL
Q4Calculate the amount of each ingredient required for 15mL of the formula listed below
IngredientMaster formulaSubstance A12mLSubstance B4mLSubstance C5mcL/mLSubstance D0.5mg/mLSubstance E8mLWater to:60mL
Q1Q2Q3Q4A72g600mg1286.4g3mLB112.5g300g720g1mLC30.6g30mL0.24g75mcLD315mL225mL57.6mL7.5mgE0.3825g0.3g12g2mL
Answers