Drug Calculation Cases

What's included?

100+ cases 💊

Improve your prescribing skills with our growing collection of drug calculation cases.

Key topics 🤔

Learn to accurately calculate drug doses, infusion rates and medication conversions across different units.

Realistic ✅

All questions are written by practising clinicians and educators to reflect realistic clinical scenarios.

Clear explanations ✍️

Each case includes detailed explanations to help you master complex calculations and understand common pitfalls.

CPD certificates 📄

Downloadable certificates with performance metrics for CPD evidence.

Notebook ✍️

Access to our Notebook with 350+ topic summaries.

Webinars 🎥

Access all previously recorded webinars with downloadable attendance certificates for CPD.

Example

Cases

Example

Infusion rate calculation

Q Case 1 of 100

A 78-year-old man with acute pyelonephritis is to be given gentamicin 5 mg/kg by intravenous infusion. He weighs 80 kg.

Gentamicin is available as 80 mg/2 mL solution. This should be diluted with 50 mL sodium chloride 0.9% and given over 1 hour. A standard infusion set administers 1 mL in 20 drops.

What drip rate (drops/min) is required to deliver the gentamicin infusion?

Example

Drug dose calculation

Q Case 2 of 100

A 45-year-old woman is admitted to the emergency department with severe cellulitis. The decision is made to start intravenous vancomycin.

The recommended loading dose of vancomycin is 25 mg/kg body weight, administered over 2 hours. Vancomycin is supplied in 500 mg vials. The patient weighs 85 kg.

How many vials of vancomycin are required to administer the loading dose?

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