Layers of Medication Safety: From Prescribing to Dispensing

Medication errors are common — and preventable

Unsafe medication practices and medication errors are a leading cause of avoidable harm in health care. In 2017 the World Health Organization launched Medication Without Harm, a global challenge to reduce severe, avoidable medication-related harm by 50% ^[1].

The Swiss cheese model

Psychologist James Reason described safety defences as slices of Swiss cheese. Each slice has holes — weaknesses — but harm only reaches the patient when the holes in every slice line up ^[2]. The answer is not one perfect check, but several imperfect, independent ones.

Checks at each step

• Registration — record allergies and current medicines accurately from the start.
• Prescribing — screen for drug–drug, drug–food, and drug–lab interactions, allergies, and contraindications.
• Approval — the prescribing doctor reviews and signs off.
• Pharmacist validation — an independent professional checks dose, interactions, and allergies again.
• Patient counselling — clear instructions help patients take medicines correctly at home.

Why independence matters

A second check is only valuable if it is truly independent. If the pharmacist simply trusts the prescriber's check, the two slices share the same holes. That is why MediFlow AI keeps doctor approval and pharmacist validation as separate steps, each recorded on its own.