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Dosage Calculation Using Formula Method

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  • 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

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