Common Registration Assessment, Part 1

Fludrocortisone microgram tablets and daily doses for the GPhC assessment

Three original practice questions, with the working shown. Read the stated prescription or plan before calculating.

Published 9 November 2026. Independent revision material, not GPhC questions, not for patient care.

A glass of water and a pill organiser on a white marble surface
Photo from Pexels, used under the Pexels licence. It is a stock image and does not show the exercise.

The manufacturer's UK product information for fludrocortisone acetate 0.1 mg tablets states that the adult daily dosage range is 0.05 to 0.3 mg orally.

The same information states that for the paediatric population the dose is half a tablet (0.05 mg) to one tablet (0.1 mg) daily, and that the tablets are for oral use.

The strengths here sit in both milligrams and micrograms: 0.05 mg is 50 micrograms, 0.1 mg is 100 micrograms and 0.3 mg is 300 micrograms. Converting between mg and micrograms is the core skill on this page.

Each question fixes the values needed for its arithmetic. Write the unit beside every step and never mix mg and micrograms in the same line. All prescriptions and patients here are fictional; these are revision materials, not for patient care.

The method

  1. Convert the stated dose into one unit: 1 mg = 1000 micrograms.
  2. Divide the dose by the 0.1 mg (100 micrograms) tablet strength for the daily tablet count.
  3. Multiply the daily tablet count by the stated days for a supply quantity.
  4. Keep mg, micrograms and tablet counts separate; convert only when the question asks.

Three practice questions

Work each one on paper first, then open the answer. All patients and prescriptions are fictional.

Question 1

A fictional adult takes fludrocortisone 0.2 mg daily, using 0.1 mg tablets. Convert the dose to micrograms and state the daily tablet count.

Show the answer

Answer: 200 micrograms; 2 tablets

Working: 0.2 mg x 1000 = 200 micrograms. 200 micrograms / 100 micrograms per tablet = 2 tablets daily.

Question 2

A fictional patient takes fludrocortisone 150 micrograms daily, using 0.1 mg tablets. How many tablets are taken each day?

Show the answer

Answer: One and a half tablets

Working: 0.1 mg = 100 micrograms per tablet. 150 micrograms / 100 micrograms = 1.5 tablets daily.

Question 3

A fictional adult takes one fludrocortisone 0.1 mg tablet daily. How many tablets are needed for 28 days, and what total dose in micrograms do they provide?

Show the answer

Answer: 28 tablets; 2800 micrograms

Working: 1 tablet x 28 days = 28 tablets. 28 x 100 micrograms = 2800 micrograms in total.

eMC SmPC: Fludrocortisone Acetate 0.1 mg Tablets

https://www.medicines.org.uk/emc/product/13324/smpc

Where marks are lost

  • Mixing mg and micrograms in the same line of working; 0.1 mg is 100 micrograms.
  • Reading 0.2 mg as 20 micrograms instead of 200 micrograms.
  • Reporting the tablet count when the question asks for the dose in micrograms.

Frequently asked questions

Are these official assessment questions?

No. They are original revision exercises, not official GPhC questions and not for patient care.

Does this calculation decide a real fludrocortisone dose?

No. Follow the stated prescription in the exercise. Real dosing is adjusted to response within the label range.

How should I check the answer?

Convert everything to micrograms before dividing by the 100 microgram tablet strength.

Sources

The questions above are original and use fictional patients and prescriptions. PreRegExamPrep is not affiliated with or endorsed by the General Pharmaceutical Council.

Practise until the method is automatic

Try 15 free questions with worked answers. No sign-up required.

More calculation topics

See also the formula sheet, the eight sample questions and the approved calculator page.