What should staff know about PRN (“as required”) medicines?

What Should Staff Know About PRN Medicines?

PRN medicines, sometimes called “as required” medicines, are only given when a clearly defined symptom occurs, such as pain, anxiety, constipation, or nausea. Staff must follow the person’s care plan and the prescriber’s instructions.

In care homes, NICE SC1: Managing medicines sets the standards for safe administration of PRN medicines, and in community or home care settings, NICE NG67: Medicines support in the community provides guidance. PRN medicines require careful monitoring and documentation to ensure safety, effectiveness, and regulatory compliance.

What Are PRN Protocols and Why Are They Important?

Every PRN medicine should have a clear protocol included in the MAR or care plan. The protocol must include:

• The indication for use (what symptom it treats)

• Dose and maximum allowable dose in 24 hours

• Minimum interval between doses

• When to offer and when not to offer

• Non-drug alternatives

• When to seek advice from a prescriber or pharmacist

• How to record and review administration

Having clear PRN protocols ensures consistent, safe care and helps staff demonstrate compliance during inspections.

When Should PRN Medicines Be Given and How Is Timing Managed?

Staff must not restrict PRN medicines to fixed medication rounds. They should be administered when the agreed symptom occurs, not on a schedule that ignores the person’s needs.

In home care, the care plan must explain how PRN medicines are managed between visits and who else may support the individual. Ensuring correct timing and availability is crucial for symptom relief and safety.

How Should Staff Administer and Record PRN Medicines?

Before giving a PRN medicine, staff must check:

• Right person

• Right medicine

• Correct dose and route

• Timing relative to previous doses

• That maximum daily limits are not exceeded

After administration, record immediately on the MAR (or linked PRN sheet) the dose, time, reason, and observed effect. If a dose is declined or not needed, record according to organisational policy. Accurate MAR recording of PRN medicines is a CQC requirement.

How Should Staff Monitor the Effect of PRN Medicines?

Observing and documenting the effectiveness of PRN medicines is vital. Staff should note:

• Whether the PRN dose worked

• Duration of effect

• Any side effects

Regular review with the person, family, and prescriber/pharmacist is recommended. Frequent PRN use may indicate underlying problems or the need to adjust regular medications.

What Safety Points Should Staff Follow With PRN Medicines?

• Use the lowest effective dose according to directions

• Do not crush, disperse, or alter formulations unless authorised by a prescriber/pharmacist and documented

• For PRN controlled drugs, follow storage and record-keeping rules

• Escalate promptly for uncontrolled symptoms (e.g., pain, breathlessness, agitation, or adverse effects)

Following these safety measures protects staff, patients, and the organisation, while supporting person-centred care.

What Do Inspectors Look for in PRN Medicines Administration?

Inspectors expect:

• Clear PRN protocols aligned with prescriptions

• MAR entries showing why a PRN medicine was given and its effect

• Evidence that PRN medicines are not used as a default in place of person-centred support

Good practice in PRN medicines administration demonstrates that staff are trained, competent, and responsive to individual needs.

Why Is Staff Training Critical for PRN Medicines?

Proper training ensures staff understand both the clinical and legal aspects of PRN medicines. Training covers:

• PRN protocols and documentation

• Administration, timing, and dosage limits

• Monitoring effectiveness and reporting adverse reactions

• Escalation procedures

Staff confident in PRN medicines administration reduce errors, improve symptom control, and provide higher-quality care.

Where Can Staff Find Guidance on PRN Medicines?

• NICE SC1: Managing medicines in care homes 

• NICE NG67: Medicines support in the community

• CQC Guidance: When required medicines in adult social care

• Controlled drugs guidance: Storage and record-keeping in care homes

How Can I Learn More About Medication Training? 

Our Medication Awareness in the Care Home eLearning course helps learners understand the essentials of medicine management, their responsibilities, and how to support safe and effective care.

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