How to Write a Prescription (UK): Step‑by‑Step Guide & Common Errors to Avoid

Writing a safe and accurate prescription is a core skill for medical students, foundation doctors, and non-medical prescribers (NMPs). Prescribing errors are common, especially in OSCEs and early clinical practice.

This guide explains:

• ✅ How to write a prescription step by step

• ❌ The most common prescribing errors

• 🎯 Practical tips to improve safety and avoid losing marks

✅ Step-by-Step: How to Write a Prescription

1. Confirm Patient Details

Always include:

• Full name

• Date of birth

✅ Use at least two patient identifiers

2. Write the Drug Name Clearly

• Use the generic (non-branded) name where appropriate

• Avoid abbreviations or unclear wording

Example:  Amlodipine

3. Specify the Dose

• Include the exact dose

• Use correct units (mg, micrograms)

⚠️ Take extra care with:

• Insulin

• Opioids

• Anticoagulants

4. State the Route

Clearly document how the drug is given:

• Oral

• IV

• IM

• Subcutaneous

5. State the Frequency

Examples:

• Once daily

• Twice daily

• Every 8 hours

✅ Avoid vague instructions like “as directed”

6. Specify Duration or Quantity.  Include:

• Number of days

OR

• Total quantity (e.g. 28 tablets)

7. Check Allergies

✅ Always check and confirm allergy status
❌ Never prescribe a known allergen

8. Sign and Date the Prescription

A prescription is not valid without:

• Prescriber signature

• Date

🚫 Common Prescribing Errors

Even when you know the steps, errors can still occur.

❌ Missing Patient Details

• Omitted or incorrect identifiers

👉 Always double-check before prescribing

❌ Incorrect Dose

• Wrong dose or wrong units

👉 Always check the BNF or local guidance

❌ Wrong Frequency or Route

• Incorrect timing or method

👉 Think clinically and review before finalising

❌ Failure to Check Allergies

• A serious and preventable error

👉 Always confirm allergy status

❌ Incomplete Prescription

• Missing dose, route, frequency, or signature

👉 Use a structured checklist

🎯 Tips for OSCEs

Prescribing errors in OSCEs are usually due to:

• Rushing

• Stress

• Missing key details

✅ Use a consistent structure every time
✅ Double-check before submitting

✅ Safe Prescribing Checklist

Before completing any prescription:

• ✅ Correct patient

• ✅ Correct drug

• ✅ Correct dose

• ✅ Correct route

• ✅ Correct frequency

• ✅ Allergies checked

• ✅ Signed and dated

💡 Final Thought

Safe prescribing relies on structure, attention to detail, and consistency. By following a step-by-step approach and being aware of common errors, you can prescribe confidently and safely.

If you're preparing for OSCEs or need support with prescription writing, I offer 1:1 pharmacology tutoring and prescribing support for pharmacy and medical students. 

This includes:

- Prescription writing guidance 

- OSCE preparation 

- Clinical scenario practice 

Visit: https://www.pharmascholar.co.uk