TL;DR
Master medication dosage calculations including weight-based dosing, concentration conversions, and IV drip rates. Accurate calculations prevent medication errors and are a key exam competency.
Free Pharmacy Calculations Practice Questions
PTCB Pharmacy Technician Certification · Order Entry & Processing
This module covers Pharmacy Calculations as part of the Order Entry & Processing section, testing your understanding of core concepts and their practical application.
| Exam | PTCB Pharmacy Technician Certification |
| Pass Rate | 72% |
| Duration | 120 minutes |
| Module | Pharmacy Calculations |
Why Pharmacy Calculations matters
Pharmacy Calculations is one of the most tested areas because medication errors are among the most preventable causes of patient harm.
Sample Practice Questions (5)
1. A prescription reads: "Metformin 500 mg PO BID #180." What is the day supply?
- 90 days
- 60 days
- 180 days
- 30 days
2. A patient receives heparin 25,000 units in 500 mL D5W, infusing at 18 mL/hr. How many units of heparin is the patient receiving per hour?
- 900 units/hr
- 1,389 units/hr
- 500 units/hr
- 1,800 units/hr
3. Using alligation: How many parts of 70% alcohol and 40% alcohol are needed to prepare a 55% alcohol solution?
- 15 parts of 70% and 15 parts of 40% (equal parts, 1:1 ratio)
- 2 parts of 70% and 1 part of 40%
- 1 part of 70% and 2 parts of 40%
- 3 parts of 70% and 1 part of 40%
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Start practicing free →4. What is the percentage strength (w/v) of a solution containing 5 g of dextrose in 100 mL of solution?
- 5%
- 0.5%
- 50%
- 0.05%
5. A physician orders amoxicillin 25 mg/kg/day divided TID for a child weighing 20 kg. What is each individual dose?
- 167 mg
- 500 mg
- 250 mg
- 125 mg
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