Medication Errors in chemotherapy

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„It may be part of human nature to err, but it is also part of human nature to create solutions, find better alternatives and meet the challenges ahead.“

– Linda T. Kohn et al, Committee on Quality of Health Care in America, Institute of Medicine
Deaths per year

What are Medication Errors?

Medication error is defined as any preventable event that may cause or lead to inappropriate medication use or patient harm while the medication is under the control of the healthcare professional, patient, or consumer.Medication errors can be classified by considering the types of errors occurring, such as wrong patient, dose, infusion rate, delivery route or medication.

Medication errors may occur during any phase of the drug delivery process from prescription to drug administration and at anywhere medications are administered.3 Errors may occur with any medication; however, chemotherapy presents unique dangers due to narrow therapeutic indices, potential toxicity even at therapeutic dosages, complex regimens, and a vulnerable cancer patient population.6

Past studies have suggested that medication errors account for a significant percentage, if not a majority, of both total medical errors and medical misadventures resulting in mortality. Thus, medication errors are an important subgroup of medical errors due to their frequency, possibility of significant patient harm, and potential for prevention.6 A study revealed that antineoplastic agents were the second most common cause of fatal medication errors10 and antineoplastic drugs have been shown to be the drug-class which most commonly associated with medication error, only after anti-infective drugs.7

On a general level, of the chemotherapy medication errors reported, 39% involved over- and underdosing, 21% involved schedule and timing errors, 18% involved wrong drugs, and 14% involved chemotherapy given to the wrong patient. Less common errors included infusion-rate errors, omission of drugs or hydration, and improper preparation of drugs. Ten percent of these errors required medical intervention and prolonged hospital stays.8

Cheat Sheets

Description Document Link
Facts and Figures
pdf (1000.9 KB)
Common Medication Errors and Common Consequences
pdf (813.7 KB)

Risk: Wrong Dose

Generally speaking, wrong drug dosages can occur during all steps of the treatment process. During a 2-year period (2003-2004), Ford6 conducted a prospective study on the oncology ward of a large community hospital on medication errors. They identified 141 errors in total, thereof 38 were classified as “wrong dose”. Of these, one occurred during ordering / transcription, 20 during dispersion and 17 during application. Additional 18 errors were “medication not given”. 

Case Study

  • Wrong Dose

    In Adelaide (Australia) over a six-month period in 2014 and 2015, 10 cancer patients were given inadequate doses of the drug Cytarabine [10,11]

Prevention of wrong dose errors

Description Document Link
Chemotherapy Orders Chemotherapy error prevention recommendations for chemotherapy prescribing and preparation
pdf (33.2 KB)

Risk: Wrong infusion rate

Marked inaccuracies in IV fluid infusion rates are common, and do not seem to be perceived by staff as important. Metered pumps have been shown to improve accuracy. Rooker et al.13 studied the IV infusion rates in patients requiring continuous IV fluids during a four-week period. The periods over which iv crystalloid fluid bags were administered were compared with the time prescribed. 

Checklists for Healthcare Workers

Description Document Link
Checklist for Nurses and Pharmacists How to Avoid Medication Errors in Chemotherapy
pdf (929.5 KB)
Checklist for Physicians How to Avoid Medication Errors in Chemotherapy
pdf (925.9 KB)

Did you know?

Wrong infusion rate

Risk: Wrong delivery route

Most of the chemotherapy regimes are given intravenously, i.e. directly into the venous system. Peripheral venous access may be suitable, however, given the high toxicity of the drugs, mostly central venous access are preferred.

Case Study

  • Wrong Delivery Route

    A 6-year-old girl received intrathecal medication during her outpatient treatment. 3 days later she presented at the emergency room with pain in her neck and legs ...[14]

Some of the chemotherapy regimen require other patient access routes, such as intra-arterial access for isolated organ perfusion (e.g. for hepatic metastases) or intra-thecal applications (into the spinal canal, through a lumbar injection).

Cytarabine (Ara-C) can be used intrathecally for carcinomatous meningitis due to lymphoma or leukemia, and methotrexate can be given intrathecally for carcinomatous meningitis due to breast and bronchial cancers.15

For example, a patient with highly malignant non-Hodgkin’s lymphoma with cancerous meningitis would typically receive Vincristine 2 mg IV plus Methotrexate 10-15 mg intrathecally.

Carcinomatous meningitis

Some cancers can lead to metastases on the meninges, called carcinomatous meningitis. It occurs often in patients with leukemia or lymphoma, but also in breast cancer and bronchial cancer or malignant melanoma.

Patients with solid tumors plus carcinomatous meningitis have a bad prognosis. Without treatment, their mean survival time is mostly a few weeks only.

Importance of correct delivery route

Vincristine is a vinca alkaloid antineoplastic agent intended for iv use only. Vincristine should never be administered subcutaneously, intramuscularly or intrathecally, as this results in necrosis.14 Accidental vincristine administration via the spinal route (intrathecally via a lumbar puncture or intraventricularly via an Ommaya reservoir) causes rapid sensory and motor dysfunction, usually followed by encephalopathy, coma, and death.16 Thus it has to be made sure that with combination chemotherapy, each drug is given into the correct patient access port.

Route delivery errors

Route delivery errors, of which intrathecal vincristine delivery is one example (there are many other examples such as intravenous delivery of benzathine penicillin, a galenic depot-formulation for intramuscular use), account for 5% of medication errors.17

The specific risks of maladministration of vincristine sulfate were clearly recognized from the early experience in the 1960s.18 However, since then, 58 cases of intrathecal vincristine errors are known to have occurred which have been reviewed intensively.18,14  Out of these cases with inadvertent intrathecal administration of vincristine, only eight patients survived, most of them paralyzed.14 Specific case reports have been published.14,19,20

Safeguards used to stop certain drugs being given intrathecally21

Most hospitals have strict rules to prevent the administration of vincristine and other vinca alkaloids into the cerebrospinal fluid. The rules at the Great Ormond Street Hospital for Children, London, for example, state that:

  • Cytotoxic drugs should be given only by specialist, appropriately trained staff
  • The dose of vinca alkaloid should be diluted to at least 10 ml to help distinguish it from drugs intended for intrathecal injection, for which such a large volume is rarely given
  • All administration devices containing vinca alkaloids must be labelled: “Warning: Vin…(drug name): For intravenous use only”
  • Intrathecal drugs should be administered in a designated area — for example, an operating theater
  • Drugs for intrathecal use should be delivered to the point of use from the pharmacy at a different time and packed separately from other drugs
  • No other cytotoxic drugs should be delivered to or stored in such a designated area

The universally compatible Luer connector has been identified as a key element in ‘wrong route’ medication errors. Luer connectors are widely used for delivery of infusions. Literature shows that any patient having multiple access systems in place are exposed to higher risks of misconnections.22

To reduce the risk of wrong route medication errors the International Organization for Standardization (ISO) has developed standards for small-bore connectors, one being in the field of Neuraxial and Regional Anesthesia (ISO 80369-6). Devices that comply with the ISO 80369-6 standard are called NRFit®. They are 20 % smaller in diameter compared to Luer connectors and come with a yellow colour coding.23

Checklists for Healthcare Workers

Description Document Link
How to avoid Medication Errors in Chemotherapy before and during Application
pdf (910.2 KB)

Risk: Wrong medication

Antineoplastic agents are mostly classified as high-alert medications. These are medications that pose an increased risk of patient harm when involved in medication errors.24

A majority of wrong medication errors derives from prescriptions, one of the causes being sound-alike drugs (name similarity). 

The U.S. Food and Drug Administration 2001 in their “Name Differentiation Project” requested manufacturers of sixteen look-alike name pairs to voluntarily revise the appearance of their established names in order to minimize medication errors resulting from look-alike confusion.

The encouraged manufacturers to use revised labels and labeling that visually differentiated their established names with the use of "Tall Man" (bolded uppercase) letters.25

Fig. 2 Name Differentiation Project, FDA25

The list has been adopted and enlarged by the Institute of Safe Medication Practises26, including but is not limited to antineoplastic agents.

Order verification by double checking the form should be a prerequisite before drugs are prepared by the pharmacist.27

Cheat Sheet

Description Document Link
How to Protect yourself and your Patients
pdf (836.2 KB)

Cost of medication error in chemotherapy

Errors are also costly in terms of opportunity costs. Dollars spent on having to repeat diagnostic tests or counteract adverse drug events are dollars unavailable for other purposes. Purchasers and patients pay for errors when insurance costs and copayments are inflated by services that would not have been necessary had proper care been provided. It is impossible for the nation to achieve the greatest value possible from the billions of dollars spent on medical care if the care contains errors.

But not all the costs can be directly measured. Errors are also costly in terms of loss of trust in the system by patients and diminished satisfaction by both patients and health professionals. Patients who experience a longer hospital stay or disability as a result of errors pay with physical and psychological discomfort. Healthcare professionals pay with loss of morale and frustration at not being able to provide the best care possible and society, in general, pay in terms of lost worker productivity, reduced school attendance by children, and lower levels of population health status.28

Learn more

Description Document Link
Checklist: How to avoid Medication Errors and associated Costs in Chemotherapy
pdf (938.1 KB)
How to avoid Medication Errors and associated Costs in Chemotherapy: Step by step
pdf (809.1 KB)

Preventive Strategies

„Primum nil nocere. (First do no harm.)“

– Hippokrates

“It may be part of human nature to err, but it is also part of human nature to create solutions, find better alternatives and meet the challenges ahead”. On their landmark publication in 1999, Kohn and colleagues of Institute of Medicine (IOM) called the entire healthcare sector to action.28 The IOM panel called for a transformation in the way health-care professionals understand medical error by applying principles from cognitive psychology and human factors, the study of human performance in work environments. Improvements in aviation and other safety-oriented industries, such as chemical engineering, manufacturing, and nuclear power, showed that complex systems, rather than individual practitioners, were the primary sources of error and a target for improvement opportunities through simplification, standardization, and technology.30

This has in the same year been called “Swiss Cheese Model”, referring to multiple layers of safety shields to prevent errors (holes in the cheese) to reach the patient.29 This model has been the conceptual foundation for the development of Critical Incident Reporting Systems for the reporting of and learning from critical incidents and near misses.

Fig. 1: The Swiss Cheese Model31

The American Society of Hospital Pharmacists (ASHP) consequentially developed a guideline on Preventing Medication Errors with Chemotherapy and Biotherapy in 2002 which has recently been updated.32 The guideline comprises recommendations for healthcare organizations, for multidisciplinary monitoring of medication use and verification, for prescribing systems and prescribers, for medication preparation and dispensing systems and roles for pharmacists, for medication administration systems and roles for nurses, for patient education, for manufacturers and regulatory agencies, and recommendations for identifying and managing medication errors.

Checklists for Healthcare Workers

Description Document Link
How to avoid Medication Errors in Chemotherapy before and during Application
pdf (910.2 KB)
How to avoid Medication Errors in Chemotherapy before and during Preparation
pdf (925.9 KB)

Risk: Wrong administration technique

Wrong administration techniques may comprise multiple aspects of the infusion. One example is discussed in the following: 

„Paclitaxel is a chemotherapeutic drug frequently used for breast, ovarial and bronchial cancer. The drug is likely to form microbubbles and particulate matter. The suppliers recommend that an in-line IV filter should be used during the infusion of the agent (SmpC Paclitaxel). Not using the inline filter might result in particles being infused into the patient [33].“

Particles arising from infusion therapy may induce or aggravate inflammatory response syndromes. They have been shown to generate thrombosis, impair microcirculation, and modulate immune response. Sources of particles include components of infusion systems, incomplete reconstitution of solutions or drug incompatibility reactions. Up to one million particles may be infused per patient per day. In-line filters incorporated into infusion lines retain particles and thereby nearly entirely prevent their infusion.33

Others would be errors in assembling giving sets for secondary infusions with or without pumps, Luer access-devices unintentionally left open after use or needlestick injury due to needle-based manipulation. 

Risk: Wrong Patient

Incidents involving patient misidentification (e.g., “wrong patient” errors) are not uncommon in oncology practice. Many of these incidents are near-miss or close-call situations that are averted at some point prior to reaching the patient. Patient misidentification is under-reported and its incidence is unknown.34

Case Study

  • Wrong Patient

    A nurse asked Mrs. Jackson to come back to the treatment room of an oncologist’s office for chemotherapy ...[33]

In 2002, the Joint Commission created its National Patient Safety Goals program. The No. 1 priority: improving the accuracy of patient identification. To meet this goal, healthcare providers use at least two patient identifiers — usually, name and date of birth. American Society of Clinical Oncology (ASCO) and the Oncology Nursing Society collaborated to create chemotherapy administration safety standards to reduce the risk of error when providing adult patients with chemotherapy and give a framework for best practices in cancer care.35

At a glance:34

  • Patient misidentification can occur at virtually any point in a patient encounter
  • Safety systems have the potential to reduce, but not eliminate, “wrong patient” errors because patient care is vulnerable to human error
  • Proper patient identification begins with patient registration

Products that can help to prevent medication errors


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