Medication Reconciliation Reveals a Triple Interaction Twenty-Five Minutes Before the Visit
A 72-year-old woman arrives for a routine follow-up with a grocery bag of medications, and the medical assistant performs medication reconciliation before the physician comes in. The chart lists warfarin 5 mg daily, INR 2.6 one month ago, and metoprolol. In the bag are warfarin 5 mg; an over-the-counter bottle of naproxen sodium 220 mg that the patient says she has taken 'one in the morning and one at night' for about two weeks for knee pain; and a seven-day course of trimethoprim-sulfamethoxazole that an urgent care clinic prescribed three days ago for a urinary tract infection. She mentions that her gums bleed when she brushes and that she has felt 'a little lightheaded' getting out of a chair. She asks the MA, 'Should I just stop that water pill medicine while I'm on the antibiotic?' The physician is running 25 minutes behind.
1. What do you do with this information before the physician enters the room, and how do you answer her question?
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Recognize what you are looking at. Three problems are stacked here: an NSAID added to warfarin (antiplatelet effect plus gastric mucosal injury - bleeding risk), trimethoprim-sulfamethoxazole added to warfarin (a well-documented interaction that raises INR, sometimes sharply, through altered metabolism and protein binding), and new symptoms - gum bleeding and postural lightheadedness, which could reflect over-anticoagulation or a falling hemoglobin. The recent prescription from an outside prescriber is also a care-coordination failure, because the urgent care clinic may not have known about the warfarin.
Escalate now, do not file. Flag the chart and speak to the physician directly or leave a written urgent message where it will be seen before the visit - do not drop it into a routine inbox that will be reviewed after the schedule clears. Ask whether the physician wants an INR drawn today so it can be resulted before the patient leaves.
Answer her question honestly but within scope: 'I can't tell you to stop or change any medicine - that's the doctor's call, and I don't want to guess.' Then close the loop: warfarin is not a water pill, and it is worth asking which bottle she means, because her confusion about her own regimen is itself a clinical finding the physician needs.
2. Exactly what do you document, and what should not appear in the note?
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Document:
- Patient's own words for symptoms ('gums bleed when I brush,' 'a little lightheaded getting out of a chair'), with onset and frequency.
- Every product, including OTCs, with strength, dose, frequency, and duration ('naproxen sodium 220 mg, one tablet twice daily, approximately two weeks').
- Prescriber and source for each medication, including the urgent care clinic's name for the antibiotic.
- Date of the last INR and the value.
- That the physician was notified, by what method, and at what time.
- What the patient was told, by whom, and her response.
Do not document: 'patient noncompliant' or 'patient did not follow instructions' - she was never told to avoid NSAIDs, and characterizations like that follow patients and bias future clinicians. Do not write 'counseled on drug interactions' if you did not do that; a false documentation of counseling is both inaccurate and a liability. Do not record your own interpretation of her symptoms as a diagnosis.
3. Suppose the physician stops the naproxen, orders a stat INR, and switches the antibiotic. How do you close the loop before the patient leaves?
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Confirm understanding, don't just recite. Use teach-back: 'Tell me in your own words which medicine you're stopping and which you're continuing.' Patients who can restate the plan are far more likely to follow it than patients who nod at a monologue.
Make the changes physical. Remove or clearly separate the naproxen from the bag rather than leaving it in circulation. Provide a written, updated medication list including the new antibiotic and the INR appointment time. Flag the OTC issue in plain language: 'No ibuprofen or naproxen unless you check with us first - acetaminophen is the usual alternative, and confirm that with the doctor.'
Coordinate with the outside prescriber. Send the urgent care clinic a brief note that the antibiotic was changed and why, and that the patient is on warfarin. The next prescriber will make the same mistake if no one tells them.
Schedule the follow-up INR at the interval the physician specifies and tell the patient how she will be contacted with the result. Confirm a working phone number before she leaves.