Medication Safety: High-Alert Drugs, Reconciliation, and the Pharmacist — IM Bootcamp

What interns leave able to do

Name the high-alert classes and state why they get double-checked: heightened harm when wrong, not higher error rates.¹
Run the before-every-order reflex: allergy and reaction type, renal and hepatic function, interactions, and the indication stated.
Perform a real medication reconciliation — two sources minimum, doses and last-taken verified, the discrepancy hunted down.
Use the pharmacist early: dosing, interactions, substitutions, and the “does this regimen make sense?” call.
Know the local safety systems as allies, not obstacles: alerts, double-checks, and the event report when something nearly goes wrong.

The case

Part 1 — The admission list

Your first admission of the afternoon: a 71-year-old woman with a heart-failure exacerbation. The ED list says “metformin, lisinopril, insulin, a blood thinner, something for sleep.” Her bag of bottles includes two different insulins, a warfarin bottle with a taped-on note, and a pill organizer nobody can decode. Creatinine 1.9 — her baseline is 1.1.

What do you actually do with this list — in order, and with whom?

Part 2 — The order that almost happens

Hours later, she is settled and you are writing orders. The system suggests her home “insulin” dose. You are about to continue it when the day’s numbers register: she has barely eaten, the creatinine is worse, and the two insulins in the bag were a long-acting and a mealtime pen — the list carried only one line.

Name every trap in this moment — then name who could have caught each one besides you.

Teaching points

The high-alert short list, memorized as a reflex: insulin and hypoglycemics, anticoagulants, opioids, sedatives, concentrated electrolytes, and chemotherapy — the classes defined by what happens when an error reaches the patient, not by how often errors occur.¹ Any order in these classes earns a beat of deliberate slowness: dose, route, kidney function, and what the patient actually takes. Two traps ride alongside: look-alike/sound-alike names — read the full name back, never the first syllables — and duplicate therapy, the same class arriving under two names from two lists.
Allergy is a two-part question: the drug and the reaction — a rash decades ago and an anaphylaxis are different facts with different consequences; document what you learn.
The kidneys read every order before the patient does. Renally cleared drugs at a changed creatinine are the classic intern miss; make “what’s the renal function?” part of the ordering motion, and ask the pharmacist when the answer changes the dose.
Reconciliation is detective work: the EHR list, the bottles, the patient’s own account, the pharmacy’s refill record — two sources minimum, last-dose timing established, and every discrepancy chased rather than averaged. The bag of bottles outranks the list.
The pharmacist is the call that makes you look better, not worse. Dosing in renal failure, interaction checks, substitution when the formulary balks, the sanity check on a complicated regimen — this is their profession, they answer faster than any reference, and the intern who calls early becomes the intern they trust.
The systems are allies: the interaction alert you read instead of dismissing, the order-set default you think against rather than accept, the double-check on high-alert infusions, the event report when a wrong order nearly reaches a patient — near-misses reported are the cheapest safety lesson a hospital ever gets (the error session). And the loop runs both ways: when a pharmacist or nurse questions your order, that is the system succeeding — stop, answer, and resolve it before anything proceeds.

Write it out — the “do not use” abbreviations

A relic of paper charts and handwritten orders — and still dangerous everywhere free text survives: the sig line, the note, the pre-printed form, the instruction you jot for a patient. The Joint Commission’s official list is short on purpose:²

“10u” is how tenfold insulin errors happen: U and u are mistaken for zero, four, or “cc.” Write units — and international units, never IU.
qd and qod are mistaken for each other and for qid. Write daily and every other day.
Decimals, both directions: a naked .5 mg reads as 5 mg and a trailing 5.0 mg reads as 50 mg when the point is missed — always a leading zero, never a trailing one on a medication.
MS · MSO4 · MgSO4 — morphine or magnesium? Write the drug’s name.

The EMR’s structured fields enforce most of this for you; The Joint Commission’s own scope note names the survivors — anything handwritten, including free-text computer entry. Your institution’s list may add more; ISMP maintains the long version.

Running the room

Minutes	Block
0–5	Frame: “nothing you do more often, nothing routine that carries more quiet risk”
5–25	Part 1 — the reconciliation, run live with a propped bag of (empty) bottles: two sources, last doses, the discrepancy chased
25–40	Part 2 — the room names every trap before the reveal, then names who else could have caught each
40–55	Order drills: five rapid scenarios — allergy-with-reaction · changed creatinine · sound-alike pair · duplicate class · a handwritten sig full of do-not-use abbreviations, translated aloud
55–70	The pharmacist’s fifteen minutes: what they catch, when to call, the consult pathway — in their own words
70–75	Pocket card

Watch for, and debrief by name: “continue home meds” treated as one order; the ED list copied forward as truth; discrepancies averaged instead of chased (“the list says one insulin, the bag says two — probably fine”); and alert fatigue defended as efficiency. The Part 2 reveal usually surfaces someone’s real near-miss — receive it the way the error session teaches: as a gift to the room, not a confession.

Pocket card

Carry this

High-alert = slow down: insulin · anticoagulants · opioids · sedatives · electrolytes.
Every order: allergy + reaction · kidneys · interactions · indication.
Reconciliation: two sources, last dose, chase every discrepancy. The bottles outrank the list.
Call the pharmacist early. It is their profession and your safety net.
Write it out: units · daily · 0.5 never .5 · the drug’s name. No u, no qd.
Read the alert you were about to dismiss. Report the near-miss.

Notes

Co-lead with a clinical pharmacist. The case is a fictional composite. Localize before teaching: your formulary, your alert system, your double-check policies, and your pharmacy’s consult pathway are the versions that govern.

This page is a teaching framework for facilitated small-group education, not clinical guidance: it names no doses, thresholds, or protocols. Prescribing decisions belong to the treating team under local policy and current references. Last reviewed July 2026.

Sources

Institute for Safe Medication Practices. (n.d.). High-alert medications in acute care settings. ECRI/ISMP. https://home.ecri.org/blogs/ismp-resources/high-alert-medications-in-acute-care-settings The maintained list itself is a download from this page; institutions adapt it locally. ↩₁ ↩₂
The Joint Commission. (2020). Official “Do Not Use” list [Fact sheet]. https://www.jointcommission.org/-/media/tjc/documents/fact-sheets/do-not-use-list-8-3-20.pdf Part of the Information Management standards. Applies to all orders and medication-related documentation that is handwritten — including free-text computer entry — or on pre-printed forms; preprogrammed EHR/CPOE fields are scoped out. ↩

Medication safety:
the orders that can hurt someone