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# Dosage Calculation Using Formula Method

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### Transcript

• 1. Calculate with Confidence 5 th edition Gray Morris Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
• 2. Dosage Calculation Using the Formula Method Unit Three: Chapter 15 Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
• 3. Dosage Calculation Using the Formula Method: Objectives
• After reviewing this chapter, you should be
• able to:
• Identify the information from a calculation problem to place into the formula given
• Calculate dosages using
• Calculate the number of tablets or capsules to administer
• Calculate the volume to administer for medications in solution
• 4. Formula for Calculating Dosages
• Nurse must use formula consistently and in its entirety to avoid errors
• Units of measure must be in same system before solving with the formula
• Memorize the formula
• 5. Terms in the Formula
• D = Desired dose
• Ordered in unit of measure desired – mg, units, mEq
• H = Strength available
• Have on hand in unit of measure available – mg, g, units
• Q = Quantity
• Unit of measure that carries what is on hand cited in
• “ H” - tabs, mL, caps
• x = Unknown
• Number of “Q”s needed to give the prescribed dose
• 6. Steps to Use Formula
• Memorize or verify formula from resource
• Place info in formula and label terms
• Make sure everything is in same system
• Apply logic test for reasonable answer
• Calculate
• Label answer with correct unit of measure
• Note: Convert apothecary and household to metric equivalents when possible – metric is the principal system used for medications
• 7.
• 8. “ Q” Key Points
• When “Q” is 1 in value, it can be omitted in the equation, but should be included
• CAUTION: “Q” value must be used when it is greater than 1
• “ Q” and the unknown “ x ” will always have the same unit of measure
• 9.
• 10. Convert to Same System First
• Order: Phenobarbital gr i p.o. at bedtime
• WRONG!
• RIGHT
• Conversion: gr i = 60 mg
= x = x
• 11. Convert Toward No Decimals
• Order: Augmentin 0.25 g p.o. q8hr
• WRONG!
• RIGHT
• Conversion Factor: 1 g = 1,000 mg
• Therefore, 0.25 g = 250 mg
• X = ½ tab
= x = x