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Pharmacy calculators are essential tools for pharmacists and pharmacy students to ensure accurate medication dosing, compounding, and conversions. Mastering these calculators through practice problems enhances accuracy and confidence in daily pharmacy practice. This article provides a series of practice problems covering the key types of pharmacy calculators.
Basic Dose Calculations
These problems focus on calculating doses based on patient weight, age, or body surface area (BSA).
Problem 1: Weight-Based Dose
A patient weighs 70 kg. The prescribed medication dosage is 5 mg/kg. What is the total dose in milligrams?
Problem 2: BSA-Based Dose
A patient has a BSA of 1.8 m2. The medication dose is 150 mg/m2. Calculate the total dose.
Concentration and Dilution Calculations
These problems involve calculating concentrations, dilutions, and final volumes for compounding or administration.
Problem 3: Preparing a Solution
How much drug is needed to prepare 250 mL of a 2 mg/mL solution?
Problem 4: Dilution Calculation
You have a stock solution of 10 mg/mL. How much of this stock is needed to prepare 100 mL of a 1 mg/mL solution?
Unit Conversions
Practice problems converting between different units commonly used in pharmacy practice.
Problem 5: Weight Conversion
Convert a weight of 150 pounds to kilograms. (Use 1 lb = 0.453592 kg)
Problem 6: Volume Conversion
Convert 500 mL to ounces. (Use 1 oz = 29.5735 mL)
Infusion Rate Calculations
These problems involve calculating infusion rates in mL/hr or drops per minute.
Problem 7: Infusion Rate in mL/hr
A medication is ordered to be infused over 4 hours with a total volume of 500 mL. What is the infusion rate in mL/hr?
Problem 8: Drops per Minute
An IV infusion of 1000 mL is to be administered over 8 hours using a drop factor of 20 drops/mL. What is the drops per minute rate?
Final Practice Problem
Combine multiple concepts: A patient weighing 80 kg requires a medication dose of 10 mg/kg. The medication is available as a 250 mg/5 mL solution. Calculate the volume to administer in milliliters.