PRN is an abbreviation of the Latin term “pro re nata”, which translates to “when necessary” or “as needed”. In health and social care, PRN medication refers to medicines given to people only when they need them, rather than on a set schedule. This approach is common in many settings, including hospitals, care homes, supported living, and sometimes at home.
PRN medicines play an important role in treating symptoms that might not be present all the time. Staff work closely with people using services, and their families, to use PRN medication safely and sensitively.
How PRN Medication Differs From Regular Prescription Medication
Some medicines are given at set times each day, as directed by the prescriber. These are known as regular or scheduled medicines. Follow the person’s medication record and check the latest NHS medicines guidance.
PRN medication works differently:
- Only taken when a particular symptom or problem appears
- Given in response to a person’s needs on that day or at that moment
- Does not have to be taken if the symptom is not present
PRN medicines enable flexibility in care. Instead of forcing a set routine, they support staff and people using services to manage short-term or occasional issues.
Examples of PRN Medication
PRN medication covers many types of symptoms and conditions. Here are some common examples:
- Pain relief, for example for headache, back pain or toothache, using the medicine the prescriber has chosen for that person
- Anxiety or distress: a medicine only where the prescriber has directed it, with regular review
- Nausea or vomiting: an anti-sickness medicine, given only as the prescriber has directed
- Constipation: a laxative, where the prescriber has made it available as a PRN medicine
- Sleeping difficulties: a sleep medicine, only as prescribed and kept under review by the prescriber
Medicines should not be used simply to manage a person’s behaviour. Support for distress should start with the person’s care plan, and any PRN medicine for distress needs the prescriber’s direction and regular review. For people with a learning disability and autistic people, see NHS England STOMP and STAMP.
The prescriber, often a GP, nurse prescriber, or consultant, decides which medication should be available as PRN.
Reasons for Using PRN Medication
Not all symptoms need regular medication. Some may come and go, or be unpredictable. PRN medication gives the person and care staff flexibility without over-medicating or missing treatment.
Some situations where PRN might be used:
- Intermittent pain, such as headache or muscular pain
- Rare bouts of anxiety or panic
- Occasional disturbed sleep
- Sudden episodes of nausea
- Distress, where support from the person’s care plan comes first and any medicine is only as the prescriber has directed
For people living in residential or supported care, their needs may depend on what happens each day, so care staff observe, communicate, and make decisions quickly and compassionately.
The Role of the Care Team
The decision to give a PRN medicine relies on careful judgement. Staff need to know:
- Which symptoms indicate the PRN drug is needed
- The dose, the maximum amount in a day and the minimum time between doses, as set out in the person’s PRN protocol (see CQC guidance on when-required medicines)
- The person’s wishes, preferences, and known side effects
Professional staff support people to communicate discomfort or distress. For those who do not communicate verbally, signs such as body language, changes in mood, or non-verbal cues may indicate a need for PRN medication.
Good communication within the care team, and with the person themselves, is critical.
Recording and Safe Practice
PRN medication requires accurate record keeping. Record each dose when it is given, following your organisation’s medicines policy (see regulation 17 on good governance). Records usually cover:
- Date and time given
- Name and dose of medicine
- Reason for administration
- Name and signature of the staff member
- Outcome and whether the medicine was effective
Regularly reviewing records helps spot patterns, such as a person needing more PRN or having frequent side effects. This can lead to changes in care, or a review of the person’s health by a clinician.
Safe practice includes:
- Checking previous doses to avoid overdosing
- Not giving PRN for convenience or to mask other problems
- Reassessing if the person keeps needing the drug
Correct storage, proper labelling, and routine stock checks are part of safe management.
Involving the Person in Decisions
People who use health and social care services should be as involved as possible in choices about their PRN medication. Their voice is central, whenever possible, to safe and respectful care.
Person-centred care is more than a phrase. It means:
- Explaining what PRN is and why it has been prescribed
- Talking through possible side effects
- Asking about preferences for what helps before giving medicine, such as a warm drink or quiet space
- Respecting cultural, religious, or personal beliefs that may affect medication choices
Support each person to take part in decisions about their medicines in the way that suits them. Family, advocates or an attorney can be involved where the person wishes or the law allows; see GOV.UK on lasting power of attorney (England and Wales).
Non-Medical Alternatives First
Care staff often try non-medical strategies before reaching for PRN medication, especially for common symptoms like mild pain, anxiety, or distress.
Non-medical approaches might include:
- Offering a hot or cold pack for aches
- Distraction with music, television, or conversation
- Gentle exercise or massage
- Reassurance and calm speech for anxiety
- Encouraging fluid intake for headache
Non-medicine support can help, but it must not delay a medicine the person needs, for example when they are in pain. Follow the person’s PRN protocol, including when to offer the medicine; see CQC guidance on when-required medicines.
Risks and Challenges
Giving PRN medication is not without risk. These risks can include:
- Giving too much by mistake (overdose)
- Drug interactions if the person takes other medicines
- Side effects, such as drowsiness or allergic reactions
- Masking an underlying medical condition
There is also a risk of staff relying too quickly on PRN medicines instead of finding the real cause of discomfort or behaviour. For example, treating agitation with a sedative may miss out on pain, hunger, or loneliness as the real reason.
Monitoring by senior staff helps limit these problems.
Training and Guidance for Staff
Care workers receive training to safely give PRN medication. This covers:
- How to recognise symptoms needing a PRN dose
- Record keeping and reporting
- Doses and timings
- What to do in case of side effects or emergencies
Every worker must work within the boundaries of their competence and follow local policies.
Guidelines such as NICE (National Institute for Health and Care Excellence) and CQC (Care Quality Commission) standards help set best practice.
Legal and Professional Responsibilities
The same medicines law applies to PRN medicines as to other medicines; see the Human Medicines Regulations 2012. Each staff member has to act within the law and according to their professional code.
Legal responsibilities include:
- Giving a PRN medicine only as the prescriber has directed, in line with the person’s protocol and your organisation’s policy (see the Human Medicines Regulations 2012)
- Not sharing medicine between people
- Reporting errors and incidents without delay
Professional guidelines, like those from the Nursing and Midwifery Council (NMC) or General Pharmaceutical Council (GPhC), require putting safety and wellbeing first.
Tailoring PRN to Individual Needs
No two people experience pain or distress exactly the same way. A person’s individual plan gives clear direction on:
- What symptoms indicate the PRN is needed
- How to support with non-medical options
- Preferred communication methods
- Cultural or religious requirements
These plans are reviewed regularly, sometimes with input from pharmacists, speech and language therapists, psychologists, or other specialists.
Reviewing and Stopping PRN Medication
Ongoing review is a key part of safe PRN medicine use. Clinical reviews consider:
- How often a person has needed the medicine
- Whether the dose is still right
- Any unwanted effects or problems
- If there is a better treatment option now
Sometimes, regular use of a PRN can reveal a new ongoing health need. The healthcare team may decide to stop the PRN and introduce a routine prescription instead.
Stopping a PRN medicine should always be discussed with the prescriber and with the person using the service.
Working with Families and Advocates
Families and loved ones play a big role in the safe use of PRN. They often spot subtle changes or can describe what works for the person.
Workers involve families or advocates by:
- Explaining the care plan and symptoms to look for
- Seeking their views on non-drug strategies
- Describing possible side effects or concerns
- Agreeing when to review or stop the medicine
A person with a health and welfare lasting power of attorney can make some decisions, including about medical care, for someone who cannot make them for themselves (England and Wales). Advocates are a separate role. See GOV.UK lasting power of attorney.
Final Thoughts
PRN medication is flexible and person-focused. It needs trust, communication, and skill.
The main principles include:
- Only given when symptoms or problems appear
- Non-drug approaches tried first, when possible
- Detailed record-keeping and regular review
- Involvement of the person, their family, and advocates
Working together, the care team and those using services can use PRN medication to improve comfort, dignity, and choice. Conversation, observation, and respect for the individual are as important as the medication itself in health and social care.