Insight · Clinical standards
The four principles of medicines optimisation.
Principle 1 — Aim to understand the patient's experience.
Medicines optimisation begins with the patient, not the prescription. At PCN scale this means structured medication reviews that ask what the medicines are doing in the patient's life — adherence, side effects, quality of life, and the patient's own goals — before any deprescribing or switch is proposed. BCS pharmacists are trained to lead consultations around the patient's own priorities, not just a polypharmacy checklist, and to capture patient-reported outcomes alongside the clinical change.
Principle 2 — Evidence-based choice of medicines.
Every change in an SMR or repeat review should be defensible against current NICE, MHRA and local formulary guidance. In practice this means cohort selection driven by evidence — over-75s on ten or more medicines, anticholinergic burden, high-risk drug combinations — and individual reviews backed by current guidance rather than habit. BCS maintains a single internal clinical reference set so every pharmacist across every PCN is reviewing against the same evidence base, and changes are signed off against that standard.
Cohorts driven by evidence
Where evidence-based optimisation starts.
- Over-75s on 10 or more regular medicines
- Anticholinergic burden above target
- High-risk drug combinations (e.g. NSAID + ACE-I + diuretic)
- Recent unplanned admission with medicines change
- Frailty-coded patients
- Long-term opioids, gabapentinoids and benzodiazepines
Principle 3 — Ensure medicines use is as safe as possible.
Safety is the principle PCNs most often under-deliver on, because the work is invisible until it goes wrong. It covers high-risk drug monitoring (DMARDs, lithium, amiodarone, anticoagulants), medicines reconciliation after discharge, identification and resolution of high-risk combinations, and weekly clinical supervision of the pharmacist team. BCS builds these into the standard operating model of every placement — they are not optional add-ons, and they are what most distinguishes a managed pharmacist service from a locum hire.
Principle 4
Make medicines optimisation part of routine practice.
The fourth principle is the one that determines whether a PCN sustains the gains. Medicines optimisation has to be a weekly, repeatable operating rhythm — not a project that runs for six weeks and then quietly stops.
A BCS placement embeds the four principles into the PCN's operating week from day one: SMR caseload, monitoring catch-up, repeat review, discharge reconciliation and high-risk drug review all run on a fixed weekly schedule, with monthly reporting through the BCS Impact Dashboard.
- Weekly SMR caseload, by named cohort
- Weekly monitoring catch-up against the high-risk drug register
- Weekly repeat-prescribing review
- Daily discharge reconciliation
- Monthly impact report to the PCN
- Quarterly review against the four principles
Why this matters for Clinical Directors.
Aligning the PCN's pharmacy work to the four principles is not just a clinical-quality exercise — it is what makes the work auditable, commissionable and defensible at ICB level. A PCN that can show its medicines optimisation operating model maps directly to the national standard is in a much stronger position when ARRS funding, IIF metrics or CQC evidence is in question. BCS reports against the four principles as standard in every monthly Impact Report.
Related BCS work.
Medicines optimisation service
How BCS delivers medicines optimisation at PCN scale.
Structured medication reviews
SMRs for complex and high-risk patients.
Cost optimisation programme
Prescribing cost reduction across the PCN.
FAQs — Four principles of medicines optimisation.
What are the four principles of medicines optimisation?+
The Royal Pharmaceutical Society defines four principles: understand the patient's experience; evidence-based choice of medicines; ensure medicines use is as safe as possible; and make medicines optimisation part of routine practice.
How do the four principles apply at PCN scale?+
They translate into structured medication reviews built around patient experience, evidence-led cohort selection, embedded high-risk drug monitoring, and a weekly operating rhythm rather than an ad hoc project.
How do BCS pharmacists align to the four principles?+
Every BCS placement runs an operating model mapped directly to the four principles, with monthly reporting against each principle in the BCS Impact Dashboard.
Talk to BCS.
If you'd like to see how this operating model would map onto your PCN specifically, talk to our Service Development team. We'll cost a plan against your remaining ARRS allocation and have a written proposal back within a week.
Talk to our Service Development team
30-minute discovery call. We'll show you how BCS maps to your PCN's specific priorities.