Medicines reconciliation: how to do it right, every time

Medicines reconciliation is the process of building the most accurate possible list of what a patient is actually taking, comparing it with what has been prescribed at admission, transfer or discharge, and resolving every discrepancy before it becomes an error. Done well, it is one of the single most impactful patient-safety activities in UK hospital pharmacy. Done badly, it is the cause of many of the medication errors that end up on incident reports.

What is medicines reconciliation?

Medicines reconciliation (often called med rec) is a structured, verifiable process. You take at least two independent sources, you compare them line by line, and you document what has changed and why. It sits at the heart of medicines safety in every UK hospital, and NICE guidance (NG5) sets the expectation that it is completed within 24 hours of adult admission. In practice, the earlier the better. A missed dose of a NOAC or a duplicated antihypertensive on the first drug round can undo everything the clinical team has planned.

The role is now largely carried by pharmacy technicians in most UK trusts. Pharmacy technicians take the history, cross-check the sources, spot the discrepancies, and hand a clean, evidenced list to the pharmacist for clinical decisions. Medicines reconciliation is one of the roles that has grown fastest for pharmacy technicians over the last decade, and it is where technical judgement, communication skill and documentation all come together.

Where medicines reconciliation happens

There are three settings where medicines reconciliation is critical. Each has different pressures, different sources, and different failure modes.

The sources you compare

Medicines reconciliation is only as good as the sources behind it. NICE and Royal Pharmaceutical Society guidance is clear: use at least two independent sources. Rely on one and you will miss things. The strongest combinations pair a patient-based source with a system-based source.

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Free medicines reconciliation checklist (PDF) Two-page step-through for admission, transfer and discharge. Print, laminate, keep on the ward.

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Why medicines reconciliation matters

Errors caused by incomplete or inaccurate medication histories are among the most common preventable causes of harm in UK hospitals. National reporting data suggests medicines reconciliation errors are behind a significant share of adverse drug events at admission, and account for many of the incidents flagged by ward pharmacists in daily prescription review.

The clinical consequences run from the mundane to the catastrophic. A missed dose of a beta-blocker can cause hypertensive rebound. An anticoagulant continued when it should have been paused can cause a bleed. An antidepressant stopped without tapering can trigger a discontinuation syndrome. A previously discontinued statin that is quietly re-prescribed can go on for years unnoticed.

Medicines reconciliation is also where much of your GPhC inspection evidence is built. Every reconciled list, every documented rationale for change, and every intervention logged is proof of the pharmacy team’s contribution to patient safety. A trust that can show consistent, well-documented reconciliation is a trust that can defend itself when an incident is investigated.

A worked example: 78-year-old admitted with a fall

To see what medicines reconciliation actually looks like, follow this admission through. Same patient, same paperwork, two different levels of rigour.

The difference between the two is not knowledge. It is process, time protected for the interview, and the discipline to check every source. Every trust has both scenarios happening on the same ward on the same day.

Common medicines reconciliation mistakes

1. Relying on a single source

The most common cause of missed medicines. A GP list on its own catches nothing bought over the counter, nothing herbal, and nothing recently changed. A patient interview on its own misses what the patient has forgotten to mention. Always compare at least two.

2. Skipping the OTC and herbal question

Patients rarely volunteer “I take some ibuprofen from the supermarket every day for my knee” unless you ask. Herbal supplements can be significant, especially St John’s wort with SSRIs, warfarin with a long list of teas, or valerian with sedatives. Ask specifically. Ask by category.

3. Not documenting the rationale for a change

Every medicine that has been added, stopped or changed since the last outpatient list needs a documented reason. “Discontinued” on its own is a red flag for the next clinician. Was it a side effect? An adverse event? Patient choice? Did it not work? Without the reason, the next team may restart the same medicine and the same error follows the patient.

4. Ignoring the community pharmacy record

Compliance data lives in dispensing records. If a monthly medicine has not been collected in three months, treat that as a signal, not a fact. Ask the patient why. Explore whether there was a side effect, a cost issue, a memory problem, or a simple change the GP had not been told about.

5. Reconciling once and not repeating at transfer or discharge

Admission reconciliation catches the errors coming in. Transfer reconciliation catches medicines that were started acutely and should have been stopped. Discharge reconciliation is the last chance to make sure the patient will actually take at home what the team intended them to take. Skip any of the three and errors slip through.

How PPets will train medicines reconciliation

Medicines reconciliation is one of the hardest skills to teach in a classroom. It is a judgement task, done at the bedside, under time pressure, with incomplete information. Traditional training relies on shadowing a senior colleague on the wards and reviewing anonymised historical cases. Both work, but neither scales. A new pharmacy technician needs dozens of reconciliations before the process becomes second nature.

PPets is building the Medicines Reconciliation Trainer, an AI-powered simulator for pharmacy technicians and pharmacists to practise real admission, transfer and discharge cases. Each scenario presents the paperwork you would have on the ward. GP summary, dispensing record, patient interview, medicines brought in. You work through the reconciliation the way you would in real practice, flag the discrepancies you spot, and the system scores you on what you caught, what you missed, and the quality of your documentation. Every session produces a PDF suitable for CPD and inspection evidence.

The trainer is in active development and will launch through the same PPets login as the Pharmacy Counter and POM Counselling Trainer apps. If you would like to be told when it opens, add your name to the interest list below and we will email you first.

Explore PPets

Medicines reconciliation is one of many pharmacy skills PPets covers. Every learner uses one PPets login, so progress carries across every course and app.

Not sure where to start? Book a free chat with Daniel and we’ll work out the right route for you.

Medicines reconciliation FAQ

What is medicines reconciliation?

Medicines reconciliation is the structured process of building the most accurate possible list of every medicine a patient is taking, comparing it with what has been prescribed at admission, transfer or discharge, and resolving every discrepancy. It sits at the heart of UK hospital medicines safety and is a core role for pharmacy technicians.

Who does medicines reconciliation in a UK hospital?

Most UK hospital medicines reconciliation is carried out by pharmacy technicians, supported by pharmacists for clinical decisions. Some trusts train nursing or medical staff to do initial reconciliation, but the depth and consistency of pharmacy-technician-led reconciliation is why the role has grown so significantly over the last decade.

When should medicines reconciliation happen?

NICE guidance (NG5) recommends completion within 24 hours of adult admission. It should also happen at transfer between wards or care settings, and again at discharge before any prescription is issued. Earlier is always better. Errors caught in the first few hours prevent doses being missed or wrong doses being given.

How many sources should you compare?

At least two independent sources. The strongest combinations pair a patient-based source (interview, medicines brought in) with a system-based source (GP summary, community pharmacy dispensing record). Relying on a single source is the most common cause of missed medicines and out-of-date lists.

What counts as a discrepancy?

Any difference between what the patient is actually taking and what is recorded. Common examples include an omitted regular medicine, a duplicated therapy, a dose or frequency that has changed since the last GP letter, an OTC or herbal medicine the prescriber did not know about, an allergy not documented, and a medicine the patient has stopped but which still appears on the record.

How can pharmacy teams train medicines reconciliation?

Traditional training relies on ward-based shadowing and anonymised case reviews. PPets is building the Medicines Reconciliation Trainer, an AI-powered simulator that lets pharmacy technicians and pharmacists practise real cases repeatedly, score their process, and see where they missed a discrepancy. Register your interest below to be notified when it launches.

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