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Alligation /Alternate

Alligation /Alternate. Purpose: An easy method to make a new strength from two existing strengths. Triamcinolone cream is available in strengths of 0.1% and 0.5%. What quantity of 0.1% and 0.5% cream is needed to make 100 grams of 0.2% triamcinolone cream?. Sample Problem.

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Alligation /Alternate

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  1. Alligation/Alternate Purpose: An easy method to make a new strength from two existing strengths

  2. Triamcinolone cream is available in strengths of 0.1% and 0.5%. What quantity of 0.1% and 0.5% cream is needed to make 100 grams of 0.2% triamcinolone cream? Sample Problem

  3. % strength starting material #2 minus % strength desired (absolute value) % strength starting Material #1 0.1 0.3 % strength desired (final product) 0.2 % strength starting material #1 minus % strength desired (absolute value) % strength starting Material #2 Basic Set Up 0.1 0.5

  4. % strength starting material #2 minus % strength desired (absolute value) Value is the # of parts needed of starting material #1 0.3 0.3 Value is the # of parts needed of starting material #2 % strength starting material #1 minus % strength desired (absolute value) 0.1 0.1 Total # of parts needed 0.4

  5. 0.3 0.4 0.75 Value is the # of parts needed of starting material #1 Total # of parts needed Ratio needed for starting material #1 0.1 0.4 0.25 Value is the # of parts needed of starting material #2 Total # of parts needed Ratio needed for starting material #2

  6. 75 grams 0.1% cream 0.75 100 grams Ratio needed for starting material #1 Final amount of product desired Amount needed of starting material #1 25 grams 0.5% cream 0.25 100 grams Ratio needed for starting material #2 Final amount of product desired Amount needed of starting material #2

  7. 75 grams 0.1% cream 25 grams 0.5% cream 100 grams 0.2% cream Answer

  8. How much of a 20% hydrocortisone (HC) cream and how much of a 5% HC cream would be needed to make 50 grams of a 9% HC cream? Example Problem

  9. 20% 4 parts 9% 5% 11 parts Basic Set Up

  10. 4 parts 4 parts 11 parts 11 parts 15 parts

  11. 4 parts 15 parts 0.267 11 parts 15 parts 0.733

  12. 0.267 50 grams 13.3 grams 0.733 50 grams 36.7 grams

  13. 13.3 grams of 20% HC cream 36.7 grams of 5% HC cream 50 grams of 9% HC cream

  14. Created by: Jeff Sundell & Doug White

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