Pharmacy Formulas

16 terms by RLester5 

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by Kim K--thanks!

C to F

F= (1.8xC)+32

F to C

C= (F-32) X 5/9 (fraction)

Young's Rule

A formula used to determine an appropriate pediatric dose by using the child's age in years and the normal adult dose; [age in years/(age in years + 12 years)] X adult dose= pediatric dose

Clark's Rule

A formula used to determine an appropriate pediatric dose by using the child's weight in pounds and the normal adult dose; weight in lb/150 lb X adult dose= the pediatric dose

Ratio

A numerical representation of the relationship between two parts of the whole or between one part and the whole

Proportion

An expression of equality between two ratios

Alligation

The concentration obtained when two or more solutions of different strengths are combined

IV Piggyback (IVPB)

A small volume of fluid and medication that is given intravenously in addition to a primary infusion over a short period of time

Weight in weight (w/w)

number of grams in the drug in 100 g of the final product
x g drug/100 g product

Weight in volume (w/v)

number of grams in the drug in 100 ml of the final product
x g drug/100 mL product

Volume in volume (v/v)

number of milliliters of the drug in 100 mL of the final product
x mL drug/100 mL product

Weight-in-weight problems involve mixing two solids, such as a dry powder and a cream

percentage strength of w/wsolution = g of active ingredient/100 g of final product x 100

Weight-in-volume problems involve adding a solid drug to a liquid, such as a powder dissolved in a syrup.

percentage strength of w/v solution = g of active ingredient/100 mL solution x 100

Volume-in volume problems involve mixing a pure liquid and another liquid, such as pure alcohol or water.

percentage strength of v/v solution = mL of active ingredient/100 mL solution x 100

IV flow rates

When calculating the duration of therapy, always round your answer down to the whole hour.

duration of therapy formula

duration of therapy = volume of fluid or amount of drug to be infused/flow rate

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