Wrong medication prescribed: when a prescription error becomes a negligence claim

Published 30 April 2026

TL;DR

A wrong medication prescribed claim arises when a prescribing doctor or dispensing pharmacist makes an error that falls below the required standard of care and causes the patient harm
Types of prescription error include: wrong drug, wrong dose, wrong patient, dangerous drug interaction, contraindicated medication, and failure to monitor during treatment
Not every medication error is a negligence claim: a temporary side effect that resolves completely may not meet the harm threshold required; permanent injury or serious harm does
The Bolam test applies separately to the prescribing doctor and the dispensing pharmacist: both may be liable if both made separate errors
Compensation depends on the injury caused; the JCG brackets for the relevant injury type apply

Wrong medication prescribed covers a range of prescription and dispensing errors that occur across clinical settings: GP surgeries, hospital wards, and community pharmacies. When a patient is given the wrong drug, the wrong dose, or a medication that interacts dangerously with their existing treatment, the results can range from a temporary adverse reaction to permanent organ damage or death. Whether a prescription error gives rise to a legal claim depends on whether the error fell below the required standard of care and caused harm that would not otherwise have occurred.

What types of prescription error qualify for a claim?

Wrong drug: prescribing a medication the patient should not receive, whether because of a contraindication, an allergy documented in the records, or a straightforward identification error (prescribing the wrong drug from a drop-down list or misreading a drug name).

Wrong dose: prescribing a dose that falls outside the safe therapeutic range for the patient's weight, age, renal function, or indication. High-risk medications including warfarin, insulin, opioids, and methotrexate have well-established dosing protocols and monitoring requirements. Errors in these drugs are a significant source of claims.

Dangerous drug interaction: prescribing a medication without checking the patient's current medication list, and the new prescription causing a dangerous interaction with an existing drug. GPs and hospital prescribers have access to interaction checking tools and their use is standard practice. Failure to check or to act on a flagged interaction can constitute a breach.

Wrong patient: dispensing or administering medication intended for a different patient. In hospital settings, patient identification checks are a fundamental safety protocol. Failure to follow them is strong evidence of a breach.

Failure to monitor: prescribing a medication that requires regular clinical or laboratory monitoring (methotrexate, lithium, clozapine, amiodarone, and others) without arranging that monitoring, or failing to act on results showing toxicity or harm, is a recognised category of prescribing negligence.

Contraindicated medication: prescribing a drug that is specifically contraindicated for the patient's known condition: for example, prescribing a non-steroidal anti-inflammatory drug to a patient with a documented peptic ulcer without appropriate gastroprotection, or prescribing a beta-blocker to a patient with severe asthma.

Who can be liable for wrong medication prescribed?

Two separate parties may be liable in a wrong medication prescribed claim: the prescribing clinician and the dispensing pharmacist. Their duties are independent and both must meet the Bolam standard in their respective roles.

The prescribing clinician (GP, hospital doctor, nurse prescriber) is responsible for selecting the correct drug, dose, formulation, and route of administration, and for checking contraindications and interactions. A prescribing error that a responsible prescriber would not have made may give rise to a claim against the prescriber.

The dispensing pharmacist is independently responsible for checking the prescription before dispensing. A pharmacist who dispenses a clearly erroneous prescription, or who fails to identify an obvious contraindication or dangerous interaction, may be liable alongside or instead of the prescriber.

In practice, claims often involve both parties. The solicitor will assess the records of the prescription and the dispensing process separately and advise on which party or parties bear responsibility.

What harm is required for a wrong medication prescribed claim?

Not every medication error gives rise to a legal claim. The error must have caused harm that meets the threshold required for a viable claim. Temporary side effects that resolve completely, minor reactions requiring no significant treatment, and errors discovered and corrected before any harm is caused are unlikely to support a claim of sufficient value to justify legal proceedings.

The harm threshold that tends to make a claim viable includes: serious adverse drug reactions requiring hospitalisation; organ damage (renal failure, hepatic damage, cardiac arrhythmia) caused by a prescribed medication; permanent neurological or other injury from a drug interaction; and death caused by a medication error.

The Bolam test assesses the prescribing or dispensing conduct. The harm is assessed separately under the compensation framework. A clear Bolam breach that caused only minor and fully-resolved harm may not be economically viable as a standalone claim.

Compensation in wrong medication prescribed claims

Compensation in a wrong medication prescribed claim is assessed by reference to the injury caused. General damages are assessed under the Judicial College Guidelines (17th edition, April 2024) in the bracket relevant to the specific injury.

Kidney damage: moderate kidney damage requiring treatment but not dialysis is assessed in the £37,760 to £52,500 bracket. Severe kidney damage requiring long-term dialysis or transplant is higher.

Cardiac injury: the JCG cardiac section ranges from £14,900 for minor chest injury with full recovery to £169,940 for serious cardiac damage with permanent consequences.

Organ failure and death: where a prescription error causes fatal harm, the estate and dependants may have separate claims under the Law Reform (Miscellaneous Provisions) Act 1934 and the Fatal Accidents Act 1976 respectively.

Special damages cover financial losses including private treatment costs, lost earnings, and care costs.

For a full breakdown of compensation ranges, see the compensation guide. For the medication errors landing page, see medication errors.

Time limits and how to start a claim

The time limit is three years from the date of the prescription error or from the date of knowledge if the harm only became apparent later. Many prescription error harms are immediately apparent. Others, such as cumulative organ damage from long-term over-prescription, may only become apparent over time.

A solicitor will obtain the GP records, hospital records, and pharmacy dispensing records, and instruct an independent prescribing expert and, where relevant, a clinical pharmacologist. For the full claims process, see the how to claim guide. For time limits, see the time limits guide. For funding, see the funding guide.

This page provides legal information, not legal advice. If you believe a prescription error has caused you harm, speak to a qualified solicitor who specialises in clinical negligence.