Wrong Treatment Negligence Claims in Ireland

What counts as wrong treatment negligence in Ireland?

Wrong treatment negligence occurs when a healthcare professional in Ireland correctly identifies a patient's condition but then prescribes, administers, or manages a course of treatment that no reasonably competent practitioner of equal skill would have chosen while acting with ordinary care. The legal framework for this test comes from Dunne v National Maternity Hospital (1989) IR 91, as reaffirmed by the Supreme Court in Morrissey v HSE (2020) IESC 6, as analysed by Hayes Solicitors (2020) [3].

The defining feature is the "protocol gap." Your medical records show the correct condition. Yet the treatment you received was contraindicated for that condition, outdated compared to current HSE clinical guidelines, or simply inappropriate for your specific circumstances. We call this the Protocol Gap Test: comparing what the clinical guidelines recommended for your diagnosis against what you actually received. An important point: wrong treatment claims can succeed even when the treatment itself is widely used for other conditions. The question isn't whether the drug or therapy works in general, but whether it was right for your diagnosis and clinical profile.

Wrong treatment claims do not require proof that the doctor acted with bad intentions. They require proof that the decision to treat in a particular way fell below the accepted standard. That standard is measured against what a responsible body of medical practitioners would consider appropriate, as defined by the Dunne Principles.

How does wrong treatment differ from misdiagnosis and surgical error?

The main difference between wrong treatment and misdiagnosis is where the error occurs in the clinical pathway. Misdiagnosis is a failure of identification. Wrong treatment is a failure of clinical management after identification. Surgical error is a failure of technical execution during a procedure. Confusing these categories can weaken a claim or direct it to the wrong legal framework.

A poor outcome is not the same as a negligent treatment. A treatment can follow all the correct protocols and still produce a poor outcome. The key difference is whether the choice to use that treatment was one that a competent practitioner would defend with clinical evidence. If it was, no claim arises, regardless of the outcome.

Common types of wrong treatment in Irish healthcare

Wrong treatment claims in Ireland typically fall into five categories. Each involves a correct or obvious diagnosis followed by a management failure. These categories reflect patterns from Irish clinical claims data reported by the State Claims Agency [2] and the types of incidents now classified as notifiable under the Patient Safety Act 2023 [1].

1. Medication and prescription errors

The wrong drug, wrong dose, or a medication contraindicated by the patient's known allergies or existing prescriptions. The State Claims Agency's clinical risk data on medication incidents (SCA, 2024) [4] confirms that prescribing errors, dispensing errors, and administration errors each carry different liability pathways. A GP prescribing the wrong antibiotic is a different claim from a pharmacist dispensing the wrong drug or a nurse administering the wrong dose.

2. Failure to follow HSE clinical guidelines

Ireland's National Clinical Effectiveness Committee (NCEC) publishes clinical guidelines that represent the expected standard of care. Failure to deliver the Sepsis 6 bundle within one hour, or failure to administer thrombolysis within the stroke therapeutic window, are treatment protocol breaches. While Perez v Coombe (2024) IEHC confirmed that clinical guidelines "guide" rather than dictate, deviating without a documented clinical reason significantly weakens the defence, as confirmed in Mason Hayes & Curran's analysis (2025) [5].

3. Unnecessary procedures

A procedure performed with full technical skill but which should never have been carried out. Following the Gough v Neary (2003) IESC 39 principle, the negligence lies in the decision to treat, not the execution. If conservative management (physiotherapy, medication, monitoring) was the appropriate pathway and surgery was performed instead, that decision is a wrong treatment issue.

4. Inappropriate therapy selection

Choosing a more aggressive or invasive treatment when a less invasive alternative with comparable outcomes existed. This also covers treatments that are appropriate for other patients but wrong for a specific patient due to their age, comorbidities, or contraindications.

5. Wrong treatment timing or duration

The right treatment given too late, stopped too early, or continued too long. Cumulative harm from prolonged steroid use when the underlying condition resolved months earlier, or delayed escalation of cancer treatment despite clear progression, both fall in this category.

6. Multi-prescriber treatment conflicts

Wrong treatment does not always come from one doctor making one bad decision. When a GP prescribes Drug A and a hospital consultant independently prescribes Drug B, each prescription may be clinically sound in isolation. The wrong treatment arises from the drug interaction between them. Irish hospitals use medication reconciliation protocols to catch these conflicts at admission and discharge, but gaps in the system remain common. The HSE's own medication incident data (SCA, 2024) [4] identifies prescriber communication failures as a recurring factor in treatment-related claims.

The liability question in multi-prescriber cases is different from a single-doctor error. Each prescriber has a duty to check the patient's existing medications before adding a new one. Your GP has access to your prescription history. The hospital consultant has access to admission records. If neither checked for contraindications, both may share liability under the Civil Liability Act 1961, which allows proportionate fault allocation among multiple defendants in Ireland.

How is wrong treatment proven under Irish law?

Proving wrong treatment negligence in Ireland requires meeting the legal test established in Dunne v National Maternity Hospital (1989) IR 91 and confirmed as current law by Morrissey v HSE (2020) IESC 6. This test, known as the Dunne Principles, sets the standard of care for all clinical negligence claims in Ireland, including treatment selection decisions, as confirmed by Fieldfisher's Morrissey analysis (2020) [6].

The core question is whether the treatment decision was one that no medical practitioner of equal specialist or general status and skill would have made while acting with ordinary care. If your doctor followed a "general and approved practice," they are not negligent for doing so, even if other doctors would have chosen differently. To succeed, you must show one of two things:

Route A: No approved practice supports the choice. The treatment selected was not endorsed by any responsible body of medical opinion for your specific condition. Your independent medical expert must confirm this.

Route B: The practice itself has "inherent defects." Even if the treatment was widespread, it can still be negligent if it has obvious flaws that any practitioner giving the matter proper consideration should have recognised. The Dunne Principles are clear: repeated use of a defective practice does not make it acceptable.

The difference between assessment and acceptance in wrong treatment cases often comes down to the quality of the independent medical expert report. Your expert applies the Protocol Gap Test by comparing the treatment you received against the clinical guidelines and peer-reviewed evidence that applied at the time. The stronger the documented deviation from guidelines, the stronger the claim.

How the standard changes in emergency settings

Wrong treatment decisions made in an emergency department are assessed differently from those made in elective or outpatient settings. The Dunne Principles still apply, but the court considers the time pressure, resource constraints, and clinical urgency facing the treating doctor. A registrar in a busy A&E department at 3am has less time to weigh alternatives than a consultant in a scheduled outpatient clinic. Irish courts recognise this reality when assessing whether a treatment choice fell below the standard of care.

The emergency standard does not excuse negligence. It adjusts the benchmark. If the HSE Sepsis 6 protocol requires antibiotics within one hour of suspected sepsis, that deadline applies regardless of how busy the department is. An important distinction: treatment choices made under genuine time pressure (cardiac arrest, stroke, haemorrhage) are assessed differently from those made in A&E but without true clinical urgency (non-emergency prescribing, referral decisions). The second category is judged closer to the standard elective benchmark because the time pressure was not the reason for the treatment choice.

How do you prove the wrong treatment caused your harm?

Proving breach of duty (the Protocol Gap Test) is only half the legal challenge in wrong treatment claims in Ireland. The second element is causation: proving that the negligent treatment, and not your underlying condition, caused or materially contributed to your harm. Wrong treatment causation is harder to establish than in most personal injury claims because the patient was already ill. The defence will argue your deterioration was the natural disease course, not the treatment error.

Irish law applies the "but for" test. Your independent medical expert must demonstrate that, but for the negligent treatment, you would not have suffered the additional harm you experienced. In wrong treatment cases, the expert does this by comparing two clinical trajectories: your actual outcome under the wrong treatment versus the prognosis you would have had under the correct treatment. The gap between those two trajectories is the compensable harm.

Where the wrong treatment caused an entirely new condition that did not exist before, causation is usually straightforward. Drug toxicity that damages the kidneys, an allergic reaction to a contraindicated medication, or surgical complications from an unnecessary procedure are injuries that simply would not have occurred under correct treatment. Where the wrong treatment worsened or failed to halt the underlying condition, causation becomes contested. Your expert must disentangle the contribution of the disease from the contribution of the wrong treatment and quantify what proportion of the harm was avoidable.

Worked example. A patient correctly diagnosed with Type 2 diabetes is prescribed Drug A when the NCEC guideline recommended Drug B for their clinical profile. After eight months, kidney function declines. A second doctor switches to Drug B. Improvement follows. The Protocol Gap Test establishes breach (Drug A was not in line with the guideline for that patient). Causation is established by comparing the patient's kidney function trajectory against published Drug B outcomes data for similar patients. The gap in kidney function between expected and actual outcome represents the compensable damage. Compensation covers the kidney harm attributable to the delay in correct treatment, not the diabetes itself.

The "two schools of thought" defence (and how to defeat it)

The most common defence in wrong treatment claims is the "honest difference of opinion" or "two schools of thought" argument. The treating doctor argues that their choice was one of two legitimate clinical approaches, and the court cannot pick between them. This defence was reaffirmed in Perez v Coombe Women & Infants University Hospital (2024) IEHC, where the High Court held that choosing conservative management over surgical intervention was not negligent when supported by a responsible body of opinion, per Mason Hayes & Curran (2025) [5].

The "two schools" defence fails when the treatment choice was not a genuine alternative at all, but a deviation from evidence-based practice. HSE National Clinical Guidelines published by the NCEC (gov.ie) [7] provide the benchmarking tool. If the doctor deviated from a published guideline without documenting a valid clinical reason for that specific patient, the "two schools" defence weakens considerably.

There is a further point: the "two schools" defence assumes both approaches were considered. In practice, many wrong treatment claims involve situations where the treating doctor simply did not consider the alternative at all. Medical records that show no discussion of alternatives, no documented reasoning for the chosen path, and no informed consent conversation about other options can undermine the defence.

A failed treatment is not the same as a negligent treatment. The court's function is to decide whether the course followed complied with careful conduct, not whether a different choice would have produced a better result. That distinction protects doctors who make reasonable judgments that don't work out. It does not protect doctors who ignored published protocols or chose treatments that no competent colleague would support.

What are your rights under the Patient Safety Act 2023?

Since 26 September 2024, the Patient Safety (Notifiable Incidents and Open Disclosure) Act 2023 requires Irish hospitals and healthcare providers to disclose serious patient safety incidents to patients and their families. This applies to both public and private health services. The Act was commenced by the Minister for Health on that date, per the Gov.ie commencement notice (September 2024) [8].

Wrong treatment incidents that result in death, serious harm, or the need for further intervention may qualify as "notifiable incidents" under Schedule 1 of the Act. When an incident is notifiable, the hospital must hold an open disclosure meeting with the patient (or family), provide factual information about what happened, and make an apology where appropriate. These meetings must now be reported to HIQA [9] or the Mental Health Commission as appropriate.

One detail that surprises clients: while an apology given under the Act cannot be used as an admission of liability in court proceedings, the factual findings from the mandatory review process are discoverable. The treatment timeline, the clinical decisions made, and the conclusions about what went wrong can all be obtained through your solicitor during the claims process. Requesting the Notifiable Incident Review Report is a practical first step.

The wrong treatment claim process in Ireland (6 steps)

Wrong treatment claims in Ireland follow a structured process. Medical negligence cases typically take over four years to resolve, according to a 2024 analysis by the Medical Protection Society, as reported in the Irish Examiner (April 2025) [10]. Delays in obtaining medical records can add months before your solicitor even begins the legal analysis.

Step 1: Obtain your medical records. Request your full clinical file from the hospital or GP under the Data Protection Acts. You're entitled to these. Review them with your solicitor for treatment decisions, documented reasoning, and consent records.

Step 2: Commission an independent medical expert report. An expert of equal or higher specialisation reviews your records against the clinical guidelines and accepted practice at the time of treatment. This report determines whether the treatment fell below the Dunne standard. Expert report turnaround in Ireland typically takes three to six months, depending on the speciality.

Step 3: Issue court proceedings (medical negligence is exempt from the IRB). Unlike most personal injury claims, medical negligence claims are exempt from the Injuries Resolution Board (IRB, formerly PIAB) process under Section 3(d) of the Personal Injuries Assessment Board Act 2003. This means you do not need to apply to the IRB [11] before commencing court proceedings. Your solicitor issues a personal injuries summons directly in the relevant court (typically the High Court for wrong treatment claims, given the complexity and value involved).

Step 4: Issue pre-action correspondence. Your solicitor writes to the defendant (typically the HSE or private hospital) setting out the claim. For public hospitals, the State Claims Agency [2] manages the response.

Step 5: Negotiate or proceed to court. Many clinical claims resolve through mediation or settlement. The SCA reports that 43% of clinical claims concluded in 2024 where damages were paid involved mediation, up from 32% in 2022. Only about 2% of clinical claims resolved in 2024 went to a full court judgment.

Step 6: Assessment of damages. Compensation is assessed under the Judicial Council Personal Injuries Guidelines (2021) [12] for general damages (pain and suffering), plus special damages (financial losses, care costs, future treatment).

What evidence do you need for a wrong treatment claim in Ireland?

Wrong treatment claims require more specific records than a standard personal injury case. Requesting "my medical records" is not enough. Treatment negligence cases turn on what was prescribed, what alternatives existed, and whether anyone documented the reasoning behind the choice. Your solicitor needs targeted records beyond the standard clinical file.

Medication Administration Record (MAR). The MAR chart shows every drug administered, the dose, the time, and the name of the nurse or doctor who gave it. Hospital medical records often omit the MAR unless you request it separately. For medication error claims in Ireland, the MAR is the single most important document because it shows what you actually received, not just what was prescribed.

Prescription charts and pharmacy dispensing records. These show what was ordered versus what was dispensed. Discrepancies between the two can reveal dispensing errors or transcription mistakes that qualify as wrong treatment.

HSE clinical pathway compliance forms. Irish hospitals use standardised clinical pathways for conditions like sepsis, stroke, and hip fracture. Each pathway has a compliance checklist. Requesting the completed pathway form shows whether your treatment followed the required protocol steps or deviated from them. A blank or incomplete pathway form can be powerful evidence of a protocol breach.

Multidisciplinary team (MDT) meeting notes. For complex cases (cancer treatment, chronic disease management), treatment decisions are often made at MDT meetings. The notes record which options were discussed and why one was chosen over another. If no MDT discussion occurred for a treatment that warranted it, that absence itself is relevant evidence.

NCEC guideline version in effect at the time. Clinical guidelines are updated periodically. Your expert needs to compare the treatment against the guideline version that was current at the time of your care, not the current version. The NCEC archive (gov.ie) [7] maintains previous versions.

Compensation for wrong treatment claims in Ireland

Compensation for wrong treatment in Ireland is assessed under the Judicial Council Personal Injuries Guidelines (2021), which replaced the Book of Quantum. Wrong treatment compensation is often complex because the patient already had an underlying condition. The claim is for the additional harm caused by the negligent treatment, not the original illness itself, as set out in the Judicial Council Guidelines (2021) [12].

Special damages cover financial losses directly caused by the wrong treatment: loss of earnings during the extended recovery, additional medical expenses, future care costs, and travel to treatment. In catastrophic cases involving brain injury or permanent disability caused by wrong treatment, total settlements (general plus special damages) can reach millions of euro.

The SCA paid €210.5 million in clinical negligence damages during 2024, with the overall estimated outstanding liability for clinical claims reaching €5.35 billion at end-2024. Clinical claims accounted for 81% of total estimated liability despite being only 37% of active claims, reflecting the higher awards in these cases, per RTE's SCA analysis (July 2025) [13].

Time limits: the "date of knowledge" rule

The Statute of Limitations (Amendment) Act 1991 sets a two-year limit for medical negligence claims in Ireland, running from the "date of knowledge." For wrong treatment claims, this date is not when the wrong pill was taken or the incorrect procedure was performed. The clock starts when the patient knew, or ought reasonably to have known, three things: that they suffered an injury, that the injury was caused by the treatment, and that the treatment was potentially negligent, under the Statute of Limitations (Amendment) Act 1991 [14].

Wrong treatment cases regularly involve delayed discovery. A patient on an inappropriate long-term medication may not realise the treatment was wrong until a new doctor changes the prescription and improvement follows quickly. At that point, the "date of knowledge" likely begins. In practice, many patients spend months attributing worsening symptoms to their underlying condition rather than the treatment itself. If your condition worsened despite treatment and a second doctor flagged the original treatment as inappropriate, you may still be within time even if the treatment started years ago.

For children, the two-year period does not begin until they reach 18. For patients who lack mental capacity, the limitation period is suspended until capacity is restored.

When does the clock actually start? Common trigger events

Irish courts assess the "date of knowledge" based on specific clinical events, not on a patient's general sense that something went wrong. For wrong treatment claims, certain events have been treated as constructive knowledge triggers in Irish case law:

Change of consultant or referral to a different speciality. When a new specialist reviews your case and changes the treatment plan, that review may constitute the point at which you "ought reasonably to have known" the original treatment was questionable. The new consultant's records become critical evidence of when the issue was first flagged.

Medication change with rapid improvement. If a new doctor substitutes your medication and your condition improves quickly, that improvement is circumstantial evidence that the original prescription was inappropriate. Courts may treat the date of the medication change as the date of knowledge, particularly if the prescribing doctor explained why the change was needed.

Independent medical report. If you commissioned an independent expert opinion and the report concluded the treatment was below standard, the date you received that report is a clear knowledge trigger. For claimants who suspected something was wrong but lacked clinical confirmation, the expert report often crystallises the date of knowledge.

Open disclosure meeting under the Patient Safety Act 2023. If the hospital conducted a mandatory open disclosure meeting about a treatment error, the date of that meeting is strong evidence of knowledge. The factual information provided during disclosure, combined with any written summary, gives the patient the three elements required: awareness of injury, awareness of causation, and awareness that the treatment may have been negligent.

Do you have a wrong treatment claim?

Use this structured check to assess whether your experience may give rise to a wrong treatment negligence claim in Ireland. The Protocol Gap Test below is general guidance, not legal advice. Every case turns on its own facts.

What does a wrong treatment claim cost in Ireland?

Your solicitor must provide a written costs disclosure under Section 150 of the Legal Services Regulation Act 2015 before taking on your case. Wrong treatment claims in Ireland are typically run on a "no win, no fee" basis, meaning your solicitor's professional fees are only payable if the claim succeeds. If the claim fails, you do not pay solicitor fees, though you may remain liable for disbursements already incurred.

Disbursements are the out-of-pocket costs your solicitor pays on your behalf during the case. The largest is the independent medical expert report, which typically costs between €2,000 and €5,000 in Ireland depending on the speciality. Court filing fees, barrister brief fees, and any additional expert reports (for example, an actuarial report for future loss of earnings) are separate. Because medical negligence claims are exempt from the IRB, there is no IRB application fee. Your solicitor's Section 150 letter must itemise these potential costs before you commit.

If you win, the losing side is usually ordered to pay a significant portion of your legal costs under the normal costs rules. Your solicitor can explain the likely costs exposure for your specific claim during the initial consultation.

What should you do right now?

Irish wrong treatment data snapshot

Treatment-related clinical claims form a substantial portion of the State Claims Agency's caseload. These figures provide context for how common and costly wrong treatment errors are in Ireland's healthcare system.

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