Medication and Prescription Errors: When Can You Claim Against a Hospital or Pharmacy?

You can bring a clinical negligence claim for a medication or prescription error if the mistake fell below the standard of care you were entitled to expect and caused you avoidable harm. Errors can arise at any point in the medication process, from a GP prescribing the wrong drug or dosage, to a pharmacist dispensing the wrong medication, to a failure to monitor how a patient is responding to treatment, and the legal framework treats each of these as a potential basis for a claim.

This guide explains the different types of medication error that can give rise to a claim, who may be liable depending on where the error occurred, and what the process of investigating and pursuing a claim involves.

What Is a Medication Error?

A medication error is any mistake made during the prescribing, dispensing, administering, or monitoring of medication, or in the advice given to a patient about how to take it. These errors can occur in a wide range of healthcare settings, including:

• NHS hospitals and NHS trust pharmacies
• GP surgeries and out-of-hours services
• Community pharmacies and chemists
• Care homes and community nursing services
• Private hospitals and private prescribing services

Not every medication error amounts to clinical negligence. Errors that cause no harm, or where the potential harm was so minimal as to be clinically insignificant, are unlikely to support a successful claim. What matters legally is whether the error fell below the standard expected of a reasonably competent healthcare professional in that role and whether it caused you harm that would not otherwise have occurred.

Common Types of Medication Error That Can Lead to a Claim

Prescribing Errors

A prescribing error occurs when a doctor, GP, or other authorised prescriber makes a mistake in the prescription itself. This includes:

• Prescribing the wrong medication for the patient’s condition
• Prescribing an incorrect dose, whether too high or too low
• Failing to check for known drug interactions before prescribing
• Prescribing a medication the patient is known to be allergic to
• Continuing a repeat prescription for too long without clinical review, leading to toxicity or complications
• Failing to prescribe medication that was clearly indicated, leading to a condition worsening

Dispensing Errors

A dispensing error occurs when a pharmacist or pharmacy technician makes a mistake in preparing or handing over medication. Common examples include:

• Dispensing the wrong medication altogether, sometimes due to similar drug names or packaging
• Dispensing the correct medication but at the wrong strength or dosage
• Providing incorrect or unclear instructions for how to take a medication
• Dispensing a medication that interacts dangerously with another medication the patient is already taking, where this information was available

Administration Errors

In hospital and care home settings, administration errors occur when medication is given to a patient incorrectly, including the wrong patient receiving another patient’s medication, the right medication being given at the wrong time or in the wrong form, or the correct dose being administered by the wrong route.

Monitoring Failures

Some medications require regular monitoring to ensure they remain safe and effective, such as anticoagulants like warfarin, certain cardiac medications, and immunosuppressants. A failure to arrange appropriate monitoring, act on concerning test results, or adjust dosage in response to changes in a patient’s condition can itself give rise to a claim where harm results.

Who Is Liable for a Medication Error?

Liability depends on where in the medication pathway the error occurred and who was responsible at that point. In practice, more than one party can share responsibility.

The prescribing doctor or GP will generally bear responsibility where the error originated in the prescription itself, such as prescribing the wrong drug or failing to identify a dangerous interaction.

The pharmacist or dispensing staff may be liable where the prescription was correct but the error occurred in the dispensing process. The Responsible Pharmacist on duty carries regulatory accountability for the safe running of the pharmacy and the actions of staff under their supervision.

The pharmacy owner or operator can bear liability, particularly where the error resulted from systemic issues within the pharmacy business, such as inadequate staffing, poor systems, or failure to implement appropriate safety checks.

The NHS trust or hospital will generally be vicariously liable for the negligent acts of its employees, including doctors, nurses, pharmacists and pharmacy technicians, where those acts occurred in the course of their employment.

Where a private pharmacy is involved rather than an NHS setting, the claim would be brought against the pharmacy or its insurer directly. Your solicitor will identify the correct defendant, or defendants, as part of the early stages of investigating your case.

What Do You Need to Prove?

As with all clinical negligence claims, a medication error claim requires you to establish three things.

Duty of care. The healthcare professional responsible for your treatment owed you a duty of care. This is not generally in dispute in any treating relationship.

Breach of duty. The care you received fell below the standard expected of a reasonably competent practitioner in that role, assessed using the Bolam test. Where an expert body of clinical opinion would have acted differently, and where that opinion is capable of withstanding logical scrutiny under the Bolitho principle, a breach of duty can be established.

Causation. The breach caused or materially contributed to the harm you suffered. In medication error claims, causation can sometimes be complex. For example, where a patient has an underlying condition and a medication error causes an adverse event, independent medical expert evidence will be needed to establish what proportion of the harm was caused by the error itself, rather than by the pre-existing condition or the natural progression of the illness.

What Evidence Is Needed?

A medication error claim will typically rely on the following categories of evidence:

• Your full medical records, including prescribing history, pharmacy dispensing records and any hospital notes
• The original prescription, where this can be obtained
• Your own account of the events, including what you were told about your medication and how
• Any receipts, packaging or medication you retained at the time
• Independent expert evidence from a suitably qualified clinician or pharmacist, setting out the applicable standard of care and whether it was met

Your solicitor will obtain the relevant records and instruct the appropriate experts as part of the investigation, so you do not need to source expert opinion yourself.

How Serious Does the Harm Need to Be?

There is no legal threshold of severity below which a claim cannot be brought, but in practice the value of any compensation will reflect the actual harm caused by the error. A medication error that led to a short hospital admission, significant pain, or a temporary setback to health may still support a claim, while errors that result in permanent disability, chronic illness, or death will give rise to much more substantial compensation.

Compensation in these cases follows the same general and special damages framework as other clinical negligence claims, covering pain and suffering, lost earnings, care costs and other financial losses that flow from the harm. For a detailed explanation of how compensation is calculated in clinical negligence cases, see our guide to medical negligence compensation.

Time Limits

The standard three-year limitation period under the Limitation Act 1980 applies, running from the date of the error or from your date of knowledge that the harm may have been caused by a medication mistake. The clock does not necessarily start on the day the error occurred: where the harm only became apparent later, or where you were not aware until obtaining further medical information that an error had taken place, the date of knowledge rule may give you longer. For a full explanation of how time limits work, see our guide to medical negligence time limits.

What to Do Next: Starting a Claim

If you believe you have been harmed by a medication or prescription error, the practical first steps are:

1. Seek medical attention if you have not already done so. Your health takes priority, and medical records documenting your symptoms and treatment create important contemporaneous evidence.
2. Retain anything you can. Keep hold of any medication, packaging, prescription slips or pharmacy receipts connected to the error.
3. Request your medical records. A solicitor can assist with this, including obtaining prescribing histories and pharmacy dispensing records.
4. Arrange an initial consultation. A specialist clinical negligence solicitor will assess whether the circumstances suggest a breach of the standard of care and whether there are reasonable grounds to investigate further.
5. Independent expert evidence is obtained. Experts in prescribing or pharmacy practice will assess whether the error fell below an acceptable standard and whether it caused your harm.
6. A letter of claim is sent. Once the evidence supports a claim, a formal letter is sent to the responsible party under the relevant pre-action protocol, setting out the basis of the allegations and the compensation sought.

Talk to Satchell Moran Solicitors

Medication and prescription errors can have consequences that go well beyond the immediate physical harm, affecting your ability to work, your long-term health, and your confidence in the healthcare system. At Satchell Moran Solicitors, our specialist clinical negligence team handles these cases with the technical rigour they require, and we act on a no win, no fee basis so there is no financial barrier to finding out whether you have grounds for a claim. As a dual Lexcel accredited firm, we are committed to giving every client honest, expert guidance from the very first conversation.

If you have been harmed by a medication or prescription error, contact us today for an initial, confidential consultation.