Dosage Calculations

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Dosage Calculations

Dosage Conversions
  • 1 mg = 1,000 mcg
  • 1 L = 1,000 ml
  • 5 ml = 1 tsp
  • 15 ml = 1 tbsp
  • 1 kg = 1,000 g
  • 1 L = 1,000 ml
  • 1 g = 1,000 mg
  • 1 mL = 1 ice
  • 3 tsp = 1 tbsp
  • 30 ml = 1 oz
  • 8 oz = 1 cup
  • 1 kg = 2.205 lb

Dosage Calculation Formula

  • The formula to calculate dosage is:
    • D (desired dose)
    • H (amount on hand)
    • X (volume)
Example One
  • Order: 037 mg po (per os, or by mouth)
  • Available tablets labeled: 025 mg
  • Desired dose (D): 0.375 mg
  • Calculation:
    • X (v) tab = D / H
    • Substitute values:
    • D = 0.375 mg
    • H = 0.25 mg
    • Solve for X:
    • X=DH=0.3750.25=1.5X = \frac{D}{H} = \frac{0.375}{0.25} = 1.5 tablets

Conclusion: An order of 037 mg results in needing to administer 1.5 tablets, or 1 and 1/2 tablets.