Common Registration Assessment, Part 1

Clonazepam tablet strengths and titration doses for the GPhC assessment

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

Published 3 November 2026. Independent revision material, not GPhC questions, not for patient care.

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Photo from Pexels, used under the Pexels licence. It is a stock image and does not show the exercise.

The NHS clonazepam page explains that the dose is usually increased gradually, and the manufacturer's UK product information for epilepsy states the initial adult dosage should not exceed 1 mg a day.

The same product information states the maintenance dosage for adults normally falls within 4 to 8 mg a day, given as a total daily dosage divided into 3 or 4 doses, with a maximum of 20 mg daily, and that the maintenance dose should be attained after 2 to 4 weeks of treatment.

For elderly patients the product information recommends the initial dose should not exceed 0.5 mg a day. Clonazepam tablets are available in 0.5 mg and 2 mg strengths.

Each question fixes the values needed for its arithmetic. Write the unit beside every step and distinguish a single dose from a daily total or a supply period. All prescriptions and patients here are fictional; these are revision materials, not for patient care.

The method

  1. Identify the exact strength and frequency stated in the question.
  2. Divide the stated daily dose by the tablet strength to count tablets per day.
  3. Divide the daily total by the stated number of divided doses to get the amount per dose.
  4. Multiply the daily tablet count by the stated number of days for a supply quantity.

Three practice questions

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

Question 1

A fictional adult patient starts clonazepam at 1 mg a day using 0.5 mg tablets. How many tablets is that each day?

Show the answer

Answer: 2 tablets

Working: 1 mg / 0.5 mg = 2 tablets a day.

Question 2

A fictional patient takes clonazepam 8 mg a day divided into 4 equal doses using 2 mg tablets. How many tablets per dose?

Show the answer

Answer: 1 tablet

Working: 8 mg / 4 doses = 2 mg per dose; 2 mg / 2 mg = 1 tablet per dose.

Question 3

A fictional prescription reads clonazepam 6 mg a day using 2 mg tablets. How many tablets are needed for 28 days?

Show the answer

Answer: 84 tablets

Working: 6 mg / 2 mg = 3 tablets a day; 3 tablets x 28 days = 84 tablets.

NHS: Clonazepam

https://www.nhs.uk/medicines/clonazepam/

Where marks are lost

  • Dividing by the wrong tablet strength when both 0.5 mg and 2 mg tablets appear.
  • Reporting the dose per administration instead of the daily total the question asks for.
  • Treating arithmetic as evidence that a real prescription is clinically suitable.

Frequently asked questions

Are these official assessment questions?

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

Can a dose-total calculation justify changing a real dose?

No. Follow the steps in the exercise. Real doses are increased gradually and need clinical checks.

How should I check the answer?

Check the requested unit, then work backwards from the quantity to the stated dose and duration.

Sources

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

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More calculation topics

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