High-alert medications
- Safe practice
These are drugs with a higher risk of serious harm when used in error; they need extra barriers such as an independent double check.
What it is
High-alert medications are not necessarily involved in errors more often than others, but when an error happens the harm is usually serious. The Institute for Safe Medication Practices (ISMP) publishes a reference list that many institutions adapt; WHO includes them among the high-risk situations of its «Medication Without Harm» challenge, and Colombia's Ministry of Health asks institutions to standardise their list, label these drugs and store them separately. Typical groups: insulins, anticoagulants, concentrated potassium chloride and other concentrated electrolytes, opioids and sedatives, chemotherapy and some anti-infectives.
What it requires
- A published institutional list that all staff know.
- Visible labelling and separate storage.
- Standardised concentrations and presentations.
- An independent double check at the highest-risk steps.
- Monitoring of the patient after administration.
Components
- Insulins: risk of hypoglycaemia; confusion between units and millilitres.
- Anticoagulants (for example heparins and warfarin): risk of bleeding.
- Concentrated electrolytes (potassium, magnesium, calcium, hypertonic sodium chloride): serious, even fatal, harm when given in error.
- Opioids and sedatives: oversedation and respiratory depression.
- Chemotherapy and some anti-infectives (such as aminoglycosides).
How it is applied (and why)
- Know your institution's list and where these drugs are kept — you cannot guard against what you do not recognise.
- Prepare without interruptions — distractions are a frequent cause of errors.
- Ask for an independent double check — two calculations done separately catch what one person misses.
- Use a smart pump and verify the programming — prevents rate errors.
- Never give concentrated potassium chloride undiluted or as a bolus; use standardised mixtures — an error can be fatal.
- Assess the patient before and after: glucose, bleeding, sedation or breathing — catches harm early.
- Report any error or near miss to the patient-safety programme — lets the system be fixed.
In nursing practice
- Before insulin: blood glucose and timing with meals.
- With anticoagulants: signs of bleeding and clotting tests per protocol.
- With opioids and sedatives: sedation level and respiratory rate before each dose and at regular intervals. If the patient is oversedated or breathing fewer than 12 times a minute, withhold the opioid (on an infusion or PCA, stop it) and report to the provider at once.
- With concentrated electrolytes: a pharmacist's final check of the mixture and an independent double check.
Common mistakes
- Doing the «double check» by looking at the other person's calculation (it is not independent).
- Keeping concentrated potassium ampoules on the ward.
- Confusing units with millilitres when measuring insulin.
- Not reassessing the patient after giving the drug.
Test yourself
Think of the answer, then tap the question to see it.
What is a high-alert medication?
One with a higher risk of causing significant harm when it is used in error, so it needs additional safety barriers.
What does an independent double check mean?
Two people separately check the drug, dose, calculation and programming, without first seeing each other's result.
Why is concentrated potassium chloride removed from the wards?
Because an error with it can cause serious or fatal harm; standardised mixtures are used instead.
What are four groups of high-alert medications?
For example: insulins, anticoagulants, concentrated electrolytes, opioids and sedatives, and chemotherapy.
Connections
Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.
Sources: Medication safety in high-risk situations (World Health Organization, 2019); Mejorar la seguridad en la utilización de medicamentos. Paquetes instruccionales, versión 2.0 (Ministerio de Salud y Protección Social de Colombia, 2015); Nursing Pharmacology (Open RN), 2.5 Preventing Medication Errors (Open RN, Chippewa Valley Technical College (LibreTexts), 2023); Grissinger M. Potassium Chloride Injection Still Poses Threats to Patients. P&T 2011;36(5):241, 302 (PubMed Central (US National Library of Medicine), 2011); Nursing Fundamentals (Open RN), 11.5 Applying the Nursing Process (Comfort) (Open RN, Wisconsin Technical College System (LibreTexts), 2021).
Spotted a mistake?We are always improving for the community. Tell us what is wrong and our team will review it.Report a mistake
Representative model, for educational purposes only.