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Dosage Calculation Using Formula Method
 

Dosage Calculation Using Formula Method

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    Dosage Calculation Using Formula Method Dosage Calculation Using Formula Method Presentation Transcript

    • Calculate with Confidence 5 th edition Gray Morris Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
    • Dosage Calculation Using the Formula Method Unit Three: Chapter 15 Mosby items and derived items © 2010 by Mosby, Inc., an affiliate of Elsevier Inc.
    • 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
    • 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
    • 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
    • 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
    •  
    • “ 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
    •  
    • Convert to Same System First
      • Order: Phenobarbital gr i p.o. at bedtime
      • WRONG!
      • RIGHT
      • Conversion: gr i = 60 mg
      = x = x
    • 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