# Pharmacy Formulas

### 16 terms by RLester5

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by Kim K--thanks!

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

Example: