Which of the following is an example of an unintentional omission during medication reconciliation?
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Clinical Pharmacology · Medication Safety and Administration
Medication Reconciliation
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In 30 seconds
Medication reconciliation is the formal process of building the most accurate possible list of everything a patient actually takes, then comparing it against every new set of orders whenever the patient moves between care settings. It exists because admission, transfer, and discharge are the moments when medication errors most easily slip through unnoticed. A rushed reconciliation can mean a home drug quietly vanishes, a hospital drug duplicates one the patient already takes, or a dose changes without anyone deciding it should.
The college version
Medication reconciliation is a structured comparison, not a casual conversation. At every transition of care — admission, transfer to a different unit or level of care, and discharge — a clinician builds a "best possible medication history" (BPMH) and reconciles it against the medications currently ordered, resolving any difference before the patient moves on.
Why transitions are the highest-risk moments
Each transition changes who is prescribing, which record system is in use, and often which drugs are still appropriate. A home antihypertensive may need to be held before surgery; an inhaler used only during flares may never appear on a hospital's order set; a nurse admitting a patient at 2 a.m. may have only a partial list to work from. None of these gaps is deliberate — medication information lives in many places at once, and no single source is complete or perfectly current. Reconciliation forces those sources to be checked against each other before decisions are made.
Types of unintentional discrepancy
Reconciliation catches several recurring error patterns. Omission is failing to order a medication the patient was taking at home. Duplication occurs when a newly ordered drug overlaps with one already active, sometimes under a different brand name. Wrong dose or frequency happens when a continued drug is transcribed incorrectly. Therapeutic duplication is subtler: two drugs from the same class, prescribed by different providers, pushing the patient toward toxicity or unnecessary effect. Failure to restart a held medication is common at discharge — a drug appropriately paused for surgery or an interacting therapy gets forgotten once the reason for holding it has passed.
Building the best possible medication history
No single source is trusted alone. Clinicians triangulate the patient and family interview, the patient's own pill bottles or blister packs, pharmacy fill records, and documentation from prior visits or discharge summaries. Each source has blind spots: patients forget infrequently used drugs, bottles may be outdated, pharmacy records miss drugs filled elsewhere or given as samples, and old notes can carry forward an uncorrected error for years. Over-the-counter drugs, vitamins, herbals, and supplements are explicitly included, because patients often do not consider them "medications" and will not volunteer them unless asked directly — yet products like fish oil, St. John's wort, or high-dose vitamin K can meaningfully interact with prescribed therapy, particularly anticoagulants.
Interprofessional responsibility
Reconciliation is not one person's job. Nurses often perform the initial interview and list-building at admission, physicians and advanced practice providers decide whether to continue, hold, or stop each drug, and pharmacists frequently verify the list for accuracy and flag interactions or duplications. Institutions assign clear accountability at each transition, because a list everyone assumes someone else double-checked is a list nobody actually reconciled.
What a good discharge medication list accomplishes
At discharge, reconciliation produces a single, current, unambiguous list reflecting what the patient should take going forward — not what they took before admission, and not simply everything ordered during the stay. It identifies which home medications were stopped and why, which were changed, and which new medications were started, so the patient, their pharmacy, and their next outpatient provider work from the same information. This closes the loop that a fragmented, verbal, or assumed handoff would otherwise leave open.
Eli explains
The same idea, in plain words
Explain it like I’m 10
Imagine switching schools partway through the year. Your old teacher knows everything about you — your reading level, your allergies, that you need glasses for the board. If nobody writes that down carefully and hands it to your new teacher, some of it gets lost, and the new teacher might make choices that don't fit you. Medication reconciliation is that careful hand-off, but for medicine: every time a patient moves to a new "teacher" — a new hospital unit, a new team, or back home — someone checks the full, true list of everything they take so nothing gets dropped, doubled up, or mixed up along the way.
Check yourself
2 review questions from the chapter. Try each one, then open the answer.
A patient's pre-admission antihypertensive was held before surgery and never restarted before discharge. What type of discrepancy is this, and what harm could it cause?
Show answer
Failure to restart a held medication; the patient could suffer poorly controlled blood pressure and related complications like stroke or heart strain after leaving the hospital.
The drug was paused for a good reason during surgery, but nobody remembered to turn it back on at the end, which is a specific, well-known type of reconciliation error with real physical consequences.
A nurse taking a medication history relies only on the pharmacy's fill records. What is a limitation of using that single source, and what should the nurse do instead?
Show answer
Pharmacy records can miss drugs filled elsewhere, given as free samples, or taken without a prescription, so the list could look falsely complete; the nurse should also interview the patient or family and check pill bottles to fill in the gaps.
One source alone always has blind spots, so a careful nurse cross-checks multiple sources rather than trusting any single record by itself.
Quick check
3 questions here. Answers stay hidden until you check.
Why are over-the-counter drugs, herbals, and supplements included in the medication history?
Choose an answer, then check it.
Which care transition requires medication reconciliation?
Choose an answer, then check it.
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