Common Registration Assessment, Part 1

Mebeverine tablets three times daily and capsule doses for the GPhC assessment

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

Published 1 November 2026. Independent revision material, not GPhC questions, not for patient care.

Woman holding her stomach in discomfort
Photo from Pexels, used under the Pexels licence. It is a stock image and does not show the exercise.

The NHS describes mebeverine as a medicine that relieves muscle spasms, and advises taking it about 20 minutes before a meal.

The manufacturer's UK product information lists 135 mg tablets taken three times a day, and 200 mg modified-release capsules taken twice a day.

A three times daily schedule triples the single dose for the daily total, while the modified-release capsule schedule doubles its single dose.

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 course supply. All prescriptions and patients here are fictional; these are revision materials, not for patient care.

The method

  1. Identify the exact form, strength and frequency stated in the question.
  2. Multiply the single dose by the stated number of daily doses to get the daily total.
  3. Calculate one day first, then scale to the stated number of days or weeks.
  4. Count tablets and capsules separately; they are different forms.
  5. Keep milligrams and tablet or capsule counts separate; convert only if 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 patient takes mebeverine 135 mg three times a day, 20 minutes before meals. How many milligrams is that each day and each week?

Show the answer

Answer: 405 mg each day; 2,835 mg each week

Working: 135 mg x 3 doses = 405 mg a day; 405 mg x 7 days = 2,835 mg.

Question 2

A fictional prescription reads mebeverine 135 mg three times a day. How many tablets should be supplied for 28 days?

Show the answer

Answer: 84 tablets

Working: 3 tablets x 28 days = 84 tablets.

Question 3

A fictional patient is switched to mebeverine 200 mg modified-release capsules twice a day. How many milligrams is that each day, and how many capsules is a 14-day supply?

Show the answer

Answer: 400 mg each day; 28 capsules

Working: 200 mg x 2 doses = 400 mg a day; 2 capsules x 14 days = 28 capsules.

NHS: Mebeverine

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

Where marks are lost

  • Using the twice daily capsule schedule for the three times daily tablets.
  • Reporting milligrams when the question asks for a tablet or capsule count.
  • 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.

Does taking a dose before meals change the calculation?

No. Meal timing tells you when the doses happen; the count still comes from doses per day times days.

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