| Course | NU141 Pharmacology for Nursing |
|---|---|
| Unit | Unit 5 |
| Paper type | Case study analysis |
| Length | About 840 words, 6 pages double-spaced |
| Format | APA 7 student paper |
| School | Purdue University Global |
| Program | BSN (prelicensure) |
| Updated | October 2026 |
Free sample paper for NU141 Unit 5
An Antacid at Breakfast and an Antibiotic That Did Not Work: A Case Study Analysis of Interacting Drugs in a Composite 58-Year-Old Woman With an Asthma Flare and Bacterial Sinusitis, From Chelation to Steroid Hyperglycemia
[Student Name]
Purdue University Global
NU141: Pharmacology for Nursing
Unit 5 Case Study Analysis
[Instructor Name]
[Date]
The patient is composite; doses and values are bracketed where illustrative, and treatment decisions belong to the prescriber.
The Case
[Mrs. V.], a composite 58-year-old bookkeeper with asthma since childhood and prediabetes, has had facial pain, thick nasal discharge and fever for nine days. Her primary care provider started doxycycline five days ago, but she is no better, and over two days her asthma worsened until she could speak only a few words at a time. On admission she is wheezing, her oxygen saturation is [91] percent and her peak flow is [42] percent of her best. Orders: albuterol by nebulizer every [4] hours and as needed, prednisone [40] mg by mouth daily, doxycycline [100] mg by mouth twice daily, and her home medicines, including calcium carbonate [1,000] mg with meals for heartburn, which she takes "with every meal and every pill."
Each Drug Alone
Albuterol stimulates beta-2 receptors on airway muscle and relaxes airway smooth muscle within minutes, relieving bronchospasm. Prednisone is a corticosteroid that reduces airway inflammation, the underlying process in an asthma flare, over hours to days. Doxycycline is a tetracycline antibiotic that stops bacteria from making proteins. Calcium carbonate neutralizes stomach acid (Burchum & Rosenthal, 2022).
Interaction One: Calcium and Doxycycline
Tetracyclines latch onto calcium and other metal ions such as iron and magnesium, forming complexes that the body cannot absorb. When doxycycline is swallowed with an antacid, much of the dose may pass through without reaching the blood (Neuvonen, 1976). Mrs. V. took her doxycycline with breakfast and dinner, each time with her calcium carbonate. That interaction may explain why her sinusitis did not improve: she may have absorbed only a fraction of each dose.
The antibiotic did not fail; it was bound to her antacid in the stomach and never had the chance to work.
Nursing action: separate the doses, giving doxycycline at least [2] hours before or several hours after any calcium, iron, magnesium or antacid product, as the pharmacist advises, and report the history to the prescriber, who may consider whether the antibiotic course should be restarted or changed.
Interaction Two: Prednisone and Blood Glucose
Corticosteroids raise blood glucose by increasing glucose production in the liver and reducing the effect of insulin in the tissues. In a person with prediabetes, a [40] mg daily dose can push glucose into the diabetic range, with the highest readings typically arriving late in the day when the dose is taken in the morning. Mrs. V.'s glucose at [4 p.m.] on day one was [246] mg/dL.
Nursing action: measure her glucose on the schedule ordered, with attention to late-day values, report values above the facility's threshold, and teach her that the rise is caused by the steroid and should settle as the dose is tapered.
Interaction Three: Albuterol and Potassium
Beta-2 agonists move potassium from the blood into cells, so frequent albuterol can lower serum potassium. Corticosteroids add a small further loss through the kidneys. Albuterol also commonly causes a fast heart rate and tremor. By the end of day one her potassium had drifted down to [3.4] mmol/L.
Nursing action: monitor potassium as ordered, watch the heart rate and rhythm, and report a falling potassium, since low potassium increases the risk of abnormal heart rhythms.
Why the Interaction Was Missed
The calcium carbonate was not on her primary care medication list, because she bought it without a prescription and did not think of it as a medicine. Her admission history caught it only because the nurse asked a specific question: "What do you take for heartburn, vitamins, or anything from the drugstore?" Over-the-counter products, supplements and antacids are a common source of missed interactions, and a medication history that asks only about prescriptions will miss them. For Mrs. V., the question changed her treatment: the prescriber switched her to a different antibiotic that does not bind calcium, and the pharmacist added a note to her chart to separate any future tetracycline from mineral products.
Priorities
Airway first: albuterol and prednisone are given on time because her breathing is the immediate threat, following the usual order of airway and breathing before other needs (Potter et al., 2023). The doxycycline-calcium interaction is addressed next, since an untreated infection can keep her asthma flaring. Glucose and potassium are monitored and reported as they change.
Teaching for Home
Bring every product, including antacids and vitamins, to each appointment, so the list is complete. If doxycycline or another tetracycline is ever prescribed again, swallow it with plenty of water while upright, at least two hours apart from calcium, antacids, iron or vitamins with minerals. Expect higher sugar readings while on prednisone. Use the rescue inhaler as directed and report a racing heart or shaking that does not settle.
References
Burchum, J. R., & Rosenthal, L. D. (2022). Lehne's pharmacology for nursing care (11th ed.). Elsevier.
Neuvonen, P. J. (1976). Interactions with the absorption of tetracyclines. Drugs, 11(1), 45-54. https://doi.org/10.2165/00003495-197611010-00004
Potter, P. A., Perry, A. G., Stockert, P. A., & Hall, A. M. (2023). Fundamentals of nursing (11th ed.). Elsevier.
NU141 Unit 5 instructions, in plain terms
Unit 5 usually brings a single patient with more than one condition, so the drugs begin to act on each other. Prompts commonly ask how each drug works, which interactions matter, what the nurse should monitor and report, and what the patient needs to know at discharge. Three to five pages, organized by drug and then by interaction, is a common structure. Faculty look for interactions explained by mechanism, for example why an antacid reduces antibiotic absorption, and for nursing actions tied to each one. Recognizing how an interaction might explain the patient's course earns credit, as does attention to over-the-counter products that patients often leave off their lists. Name the source of each mechanism you explain.
How this NU141 Unit 5 example is built
First comes the case, with her sinusitis history, admission findings, orders and her habit of taking calcium carbonate with every meal and pill. Each drug is explained in a sentence or two. Interaction one explains how tetracyclines bind calcium and other metal ions, with the highlighted line on why the antibiotic never had a chance to work. Interaction two links steroid timing to afternoon glucose. A section explains how the antacid was missed and what changed. Interaction three covers albuterol and potassium. Priorities place airway first, and teaching covers bringing every product to appointments and spacing any future tetracycline from minerals. Each interaction ends with a specific nursing action.
Where the points sit in the NU141 Unit 5 rubric
This unit's case analyses are scored on explanation of each drug, analysis of interactions, nursing actions, and teaching. Drug explanations should be accurate and brief. Interaction analysis is weighted heavily and rewards mechanisms, timing and the effect on the patient's course. Nursing action points go to specific monitoring and reporting tied to each interaction. Teaching earns credit when it addresses the interactions in practical terms the patient can follow at home. Recognizing over-the-counter products and supplements as part of the medication history is often rewarded, and sources cited in APA 7 support each mechanism described. Linking an interaction to an event in the case, such as treatment failure, often earns the highest marks.
NU141 Unit 5 help: mistakes that cost points
Analyses often list possible interactions from a database without explaining which matter for this patient or why. Another frequent gap is missing the interaction that explains the case, here an antacid making the antibiotic fail. Some papers describe steroid hyperglycemia without noting when glucose peaks, so the monitoring plan checks at the wrong times. Many forget over-the-counter products entirely. Explain each drug briefly, then pick the interactions that affect this patient, explain their mechanisms, connect them to the case's events, set monitoring at the right times, ask about every product the patient takes, and teach spacing rules in plain words. Ask about every product, not only prescriptions.
Get an NU141 Unit 5 example written to your instructions
The Unit 5 case, its questions and the rubric are all the model needs; keep the orders and allergy line exactly as given, since the analysis turns on them. Interactions get their own heading, and a different antibiotic in your version simply means a different interaction section. A first custom sample is free, usually within 24-48h. The paper above is an original model document written by our desk, not a submitted student paper and not an official Purdue University Global document.
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NU141 Unit 5 questions, answered
Where can I find a free NU141 Unit 5 sample paper?
You can read the full NU141 Unit 5 case study analysis here, covering three drug interactions in an asthma flare with sinusitis, how one was missed, priorities and teaching, with three references. Share your case details and we will work through its drug list.
Why did the antibiotic fail in NU141 Unit 5?
She took doxycycline with calcium carbonate at every meal. Tetracyclines bind calcium and other metal ions in the gut, so much of each dose may never have been absorbed.
How far apart should doxycycline and antacids be taken?
Doxycycline is usually given at least two hours before or several hours after calcium, iron, magnesium or antacid products, following the pharmacist's advice for the specific products involved.
Why does prednisone raise blood sugar?
Corticosteroids increase glucose production in the liver and reduce insulin's effect in tissues. With a morning dose, glucose often rises most in the afternoon and evening.
Can albuterol lower potassium?
Yes. Beta-2 agonists shift potassium from the blood into cells, so frequent doses can lower serum potassium. Steroids add a small further loss, so levels are monitored.