Common Registration Assessment, Part 1
Losartan tablet strengths and daily doses for the GPhC assessment
Three original practice questions, with the working shown. Read the stated prescription or plan before calculating.
Published 18 October 2026. Independent revision material, not GPhC questions, not for patient care.
The NHS lists losartan tablets in four strengths: 12.5 mg, 25 mg, 50 mg and 100 mg.
For adults the usual dose is 50 mg to 100 mg once a day for high blood pressure or kidney protection, 12.5 mg to 150 mg once a day for heart failure, and 25 mg once a day for people over 75 who need kidney protection.
Each question fixes the values needed for its arithmetic. Write the unit beside every step and keep a single dose separate from a supply total. All prescriptions and patients here are fictional; these are revision materials, not for patient care.
The method
- Identify the exact strength, dose and frequency supplied in the question.
- Calculate one dose first; divide prescribed mg by mg per tablet.
- Scale to the stated duration only when a supply is requested.
- Keep the stated strength list in view; a dose may use more than one tablet.
- Check the arithmetic against the stated dose before reporting it.
Three practice questions
Work each one on paper first, then open the answer. All patients and prescriptions are fictional.
Question 1
A fictional prescription specifies losartan 50 mg once a day using 50 mg tablets. How many tablets are needed for 28 days?
Show the answer
Answer: 28 tablets
Working: 50 ÷ 50 = 1 tablet a day. 1 × 28 = 28 tablets.
Question 2
A fictional prescription specifies losartan 100 mg once a day, but only 50 mg tablets are supplied. How many tablets is one dose, and how many for 28 days?
Show the answer
Answer: 2 tablets per dose, 56 tablets for 28 days
Working: 100 ÷ 50 = 2 tablets a day. 2 × 28 = 56 tablets.
Question 3
A fictional plan starts heart failure treatment at losartan 12.5 mg once a day using 12.5 mg tablets. How many tablets are needed for 14 days?
Show the answer
Answer: 14 tablets
Working: 12.5 ÷ 12.5 = 1 tablet a day. 1 × 14 = 14 tablets.
Exam approach
When the supplied strength does not match the dose, divide first: prescribed mg divided by mg per tablet gives tablets per dose. Then multiply by days for the supply.
Where marks are lost
- Splitting a once-daily dose into morning and evening halves without being asked.
- Assuming only one tablet can ever be used per dose.
- Reporting a supply for the wrong number of days.
Frequently asked questions
Are these official assessment questions?
No. They are original revision exercises, not official GPhC questions and not for patient care.
Do I need to memorise the strengths?
The exercise supplies them. In the assessment, read any given product information exactly as written.
How should I check the answer?
Check the requested unit, then work backwards from the quantity to the stated dose and duration.
Sources
- NHS: How and when to take losartan
- GPhC, Common Registration Assessment specification and permitted items for 2026
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.
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See also the formula sheet, the eight sample questions and the approved calculator page.