PTCB

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Advanced Topics

Pharmacy Calculations and Dosages

Mastering Pharmacy Math

Accurate calculations are vital for preparing correct dosages, especially for pediatric and geriatric patients.

Common Calculation Types

  • Converting units (mg to g, mL to L)
  • Calculating doses based on weight
  • Preparing solutions with specific concentrations

Calculation Example

If a doctor prescribes 250 mg of medication, and the available tablets are 125 mg each, you will need 2 tablets per dose.


Formula: \[ \text{Dose needed} = \frac{\text{Prescribed amount}}{\text{Tablet strength}} \]

Examples

  • Calculating how many mL of a liquid medication to dispense for a week's supply.

  • Determining the correct dose of amoxicillin for a child based on weight.

In a Nutshell

Pharmacy calculations ensure patients receive the correct medication doses.

Pharmacy Calculations and Dosages - PTCB Content | Practice Hub