UK pharmacists use drug references dozens of times per day — checking doses, confirming interactions, verifying contraindications, clarifying formulation details. The three dominant tools are MedicinesComplete (the NICE-hosted comprehensive suite), the BNF app (the mobile-first formulary), and Stockley's Drug Interactions (the definitive interaction reference). Each excels at something different.
MedicinesComplete
MedicinesComplete is NICE's comprehensive medicines information platform, bundling the BNF, BNF for Children, Stockley's Drug Interactions, Martindale, and several other references into a single subscription. Typically accessed through NHS institutional login.
Strengths: The most comprehensive single platform for UK medicines information. BNF + Stockley's + Martindale in one search. Cross-referencing between resources is seamless. The gold standard for thorough drug information queries — formulation details, excipient information, pregnancy/breastfeeding data, and interaction severity grading that the BNF alone does not provide.
Limitations: Interface can be slow for quick lookups — designed for depth, not speed. Requires institutional subscription (not personally affordable for most pharmacists). The search can return overwhelming results for common drugs. Not optimised for mobile use in the dispensary.
Best for: Thorough drug information queries — interactions, pregnancy safety, excipient checks, formulation comparisons. The reference of choice when you need depth, not speed.
BNF App
The BNF app (available on iOS and Android) provides mobile access to the British National Formulary — dosing, indications, cautions, contraindications, side effects, and monitoring requirements for every drug in the formulary.
Strengths: Fast. Mobile-optimised. Free for UK health professionals via NICE. The interface is designed for the clinical moment — open the app, search the drug, get the dose. Updated in line with BNF publication cycle. The standard quick-reference for dosing queries during dispensing.
Limitations: Interaction checking is basic compared to Stockley's — the BNF flags interactions but does not provide the depth of clinical management advice that Stockley's offers. No SmPC-level detail (excipients, pharmacokinetic parameters, detailed ADR frequencies). Search is drug-name-based — you cannot search by clinical scenario or condition.
Best for: Quick dosing lookups, caution checks, and formulary verification during dispensing or clinical consultations. The everyday workhorse.
Stockley's Drug Interactions
Stockley's is the definitive drug interaction reference — providing detailed, evidence-graded interaction monographs with clinical significance ratings, mechanism explanations, and specific management recommendations.
Strengths: Unmatched depth on interactions. Every interaction monograph explains the mechanism, cites the evidence, grades the clinical significance, and provides a specific management recommendation (adjust dose, monitor, avoid, no action needed). Essential for complex polypharmacy patients where multiple interactions need prioritising.
Limitations: Interaction-only — does not cover dosing, indications, or general prescribing information. Accessed through MedicinesComplete (institutional subscription) or standalone subscription. Not a quick-reference tool — designed for detailed interaction assessment.
Best for: Complex interaction queries — patients on 10+ medications, high-risk combinations (DOACs + azole antifungals, lithium + ACE inhibitors), and clinical situations where the interaction management advice matters as much as knowing the interaction exists.
Where iatroX Fits
Ask iatroX is not a drug reference in the traditional sense — it is a clinical AI that answers clinical questions by searching NICE CKS, BNF, SIGN, and guideline databases and returning a cited answer in seconds.
For pharmacists, this means you can ask a clinical question in natural language — "What is the maximum dose of amoxicillin in a child weighing 18kg?" or "Is metformin safe in eGFR 28?" or "What does NICE say about switching from citalopram to sertraline?" — and receive a guideline-grounded answer with a citation, faster than navigating MedicinesComplete or the BNF app.
Ask iatroX does not replace MedicinesComplete for deep interaction assessment or Stockley's for complex polypharmacy. It is the fastest route to a clinical answer when the question is specific and the context is UK practice. And for GPhC CRA revision, it is the tool that verifies management decisions against the same sources the exam tests — available at iatrox.com/ask-iatrox.
The Recommended Stack
Daily dispensing: BNF app (quick dosing lookups) + Ask iatroX (clinical questions in natural language).
Complex queries: MedicinesComplete (depth) + Stockley's (interactions).
CRA revision: iatroX Q-Bank (adaptive questions) + Ask iatroX (guideline verification).