| Course | NR 565 Advanced Pharmacology Fundamentals |
|---|---|
| Week | 3 |
| Paper type | Prescribing rationale |
| Length | About 1,160 words, 5 pages |
| Format | APA 7 student paper |
| School | Chamberlain University |
| Program | MSN, nurse practitioner core |
| Updated | October 2026 |
Free sample paper for NR 565 Week 3
Prescribing Rationale: Outpatient Community-Acquired Pneumonia in a 67-Year-Old With COPD, Type 2 Diabetes and a Daily Citalopram, and Why Levofloxacin, Azithromycin and Amoxicillin Alone Each Lost
Student Name
College of Nursing, Chamberlain University
NR 565: Advanced Pharmacology Fundamentals
Instructor Name
Month Day, Year
Prescribing Rationale: Outpatient Community-Acquired Pneumonia in a 67-Year-Old With COPD, Type 2 Diabetes and a Daily Citalopram, and Why Levofloxacin, Azithromycin and Amoxicillin Alone Each Lost
A Diagnosis Already Settled
The patient is a composite: a 67-year-old retired farm equipment dealer seen at a rural clinic on a Tuesday after three days of coughing up yellow sputum, a temperature that reached 38.6 degrees Celsius and right-sided pleuritic chest pain. A chest radiograph shows right lower lobe consolidation. Oxygen saturation is 94% on room air, respiratory rate 22, blood pressure 132/78, and the patient is alert and oriented. Blood urea nitrogen is 18 mg/dL and creatinine 1.0 mg/dL, giving an estimated creatinine clearance above 60 mL/min. The CURB-65 score is 1, for age. The patient lives with a spouse, can take oral medicine and has a car to return. Community-acquired pneumonia suitable for outpatient treatment is the working diagnosis, and this rationale does not revisit it.
The relevant history decides the antibiotic. The patient has chronic obstructive pulmonary disease, type 2 diabetes on metformin with a recent hemoglobin A1c of 7.8%, and depression treated with citalopram 20 mg daily. A baseline electrocardiogram from six months ago shows a corrected QT interval of 452 milliseconds. There are no drug allergies and no antibiotics or hospital stays in the past 90 days.
A Goal That Can Be Measured
The goal is clinical stability within 72 hours, defined as temperature below 37.8 degrees Celsius, respiratory rate below 24 and saturation at or above 92% on room air, with completion of at least five days of therapy and no hospital admission.
The Prescription as Written
Because of comorbidities (chronic lung disease and diabetes), current guidance recommends combination therapy for outpatients, pairing a beta-lactam with atypical coverage from a macrolide or from doxycycline, with a single respiratory fluoroquinolone as the alternative route (Metlay et al., 2019). The prescription chosen is:
Amoxicillin-clavulanate one 875/125 mg tablet every 12 hours for five days, swallowed as a meal begins.
Doxycycline 100 mg every 12 hours for five days, each dose with a full glass of water while sitting up, and kept two or more hours away from the calcium and magnesium tablets the patient already uses.
Pneumococcus is the main target of the penicillin component, and the clavulanate extends it to the Haemophilus and Moraxella strains that make beta-lactamase, organisms that colonize lungs damaged by COPD. Doxycycline covers atypical organisms. Neither needs dose adjustment at this creatinine clearance.
Why Levofloxacin Lost
A respiratory fluoroquinolone as monotherapy would cover all likely organisms with one tablet a day, which is attractive for adherence. It loses on three findings in this chart. First, the patient takes citalopram, which prolongs the QT interval in a dose-related way, and the baseline QT is already 452 milliseconds; adding a fluoroquinolone stacks a second QT-prolonging drug. Second, fluoroquinolones carry warnings for dysglycemia, both low and high glucose, and the patient has diabetes. Third, the patient is over 60, which raises the risk of tendon rupture, and the federal drug agency has strengthened its warnings on both the glucose and tendon effects of this class (U.S. Food and Drug Administration, 2018). Fluoroquinolones are best kept for patients who cannot take the combination.
Why Azithromycin Lost
A beta-lactam with azithromycin is the familiar combination and would have been reasonable for many patients. It loses here on the same QT concern: azithromycin also prolongs the QT interval, and a large cohort linked a five-day course to a small rise in cardiovascular death, concentrated among patients with existing cardiac risk (Ray et al., 2012). With citalopram on board and a borderline baseline QT, doxycycline provides atypical coverage without that interaction. Guidance also cautions against relying on macrolides where pneumococcal macrolide resistance is high (Metlay et al., 2019).
Why Amoxicillin Alone Lost
High-dose amoxicillin alone is first-line for healthy outpatients without comorbidities (Metlay et al., 2019). This patient is not that patient. COPD raises the chance of beta-lactamase producing Haemophilus and Moraxella, and the combination of COPD and diabetes is precisely the comorbidity profile for which guidance moves to combination therapy. Amoxicillin alone would have been the right drug for a different chart.
Interactions and Cautions in the Winning Regimen
Doxycycline absorption falls when taken with calcium, magnesium, iron or antacids, so the patient's evening supplement is moved to midday. Doxycycline can cause esophageal irritation if taken lying down and photosensitivity during outdoor work, which matters for a patient who still helps with the harvest. Amoxicillin-clavulanate commonly causes diarrhea; taking it with food reduces stomach upset. Neither drug interacts meaningfully with metformin or citalopram.
What Would Change the Plan
Three findings at follow-up would change this prescription. If the patient is no better at 72 hours, or worse sooner, the diagnosis and the setting are reconsidered before the antibiotic: admission for intravenous therapy and blood cultures is more likely to help than switching tablets at home. If the patient develops a rash with mucosal involvement or swelling, both agents stop and the patient is assessed the same day. If the patient cannot tolerate amoxicillin-clavulanate because of diarrhea, cefpodoxime 200 mg twice daily can replace it, keeping doxycycline, since guidance accepts a cephalosporin as the beta-lactam partner (Metlay et al., 2019). In none of these cases would levofloxacin become the default, because the QT and glucose concerns that removed it on day one still apply. If the patient's diabetes becomes poorly controlled during the illness, metformin may need to be held for dehydration or reduced intake, and the clinic would review glucose readings by phone before the Friday visit.
Follow-Up With a Date on It
A nurse telephone call at 48 hours (Thursday) checks temperature, breathing, oral intake and whether the patient can take the tablets. A clinic visit at 72 hours (Friday) confirms clinical stability using the measurable goal above; failure to improve by then prompts reassessment, repeat imaging and consideration of admission. Glucose is checked twice daily at home during the illness, with a call if readings exceed 300 mg/dL or fall below 70 mg/dL. A follow-up chest radiograph is not routinely needed if the patient recovers fully (Metlay et al., 2019). Pneumococcal and influenza vaccination status is reviewed at a follow-up visit once the patient has fully recovered from the infection.
Counseling
The patient is told: take both medicines twice a day for five days, even if you feel better on day three; drink a tall glass of water with each doxycycline and do not lie down for 30 minutes; move your calcium pill to lunchtime; wear long sleeves and sunscreen outdoors; and call us or go to the emergency department if you become more short of breath, confused or unable to keep fluids down.
References
Metlay, J. P., Waterer, G. W., Long, A. C., Anzueto, A., Brozek, J., Crothers, K., Cooley, L. A., Dean, N. C., Fine, M. J., Flanders, S. A., Griffin, M. R., Metersky, M. L., Musher, D. M., Restrepo, M. I., & Whitney, C. G. (2019). Diagnosis and treatment of adults with community-acquired pneumonia: An official clinical practice guideline of the American Thoracic Society and Infectious Diseases Society of America. American Journal of Respiratory and Critical Care Medicine, 200(7), e45-e67. https://doi.org/10.1164/rccm.201908-1581ST
Ray, W. A., Murray, K. T., Hall, K., Arbogast, P. G., & Stein, C. M. (2012). Azithromycin and the risk of cardiovascular death. New England Journal of Medicine, 366(20), 1881-1890. https://doi.org/10.1056/NEJMoa1003833
U.S. Food and Drug Administration. (2018). FDA reinforces safety information about serious low blood sugar levels and mental health side effects with fluoroquinolone antibiotics; requires label changes. https://www.fda.gov/drugs/drug-safety-and-availability/fda-reinforces-safety-information-about-serious-low-blood-sugar-levels-and-mental-health-side-effects
NR 565 Week 3 instructions, in plain terms
The prescribing rationale for this week usually gives you a patient with a confirmed diagnosis and asks you to choose and justify a medication. Expect the prompt to ask for the drug, dose, route, frequency and duration, the alternatives considered, monitoring and patient education. Do not argue about the diagnosis. State a goal that can be measured. Write the prescription as you would send it. Then give each rejected alternative its own paragraph and its own reason, drawn from this patient's kidney or liver function, medication list, cost or ability to follow the regimen. Set follow-up with a date and the result that would change your plan. Cite guidance for the regimen and evidence for each rejection.
How this NR 565 Week 3 example is built
The sample presents the patient, the radiograph, vital signs, a CURB-65 of 1 and the relevant history, including a borderline QT interval on citalopram. The goal is stability within 72 hours with five days of therapy. The prescription lists amoxicillin-clavulanate and doxycycline with doses, timing and food or supplement instructions, and explains what each covers. Levofloxacin loses on QT stacking, glucose warnings and tendon risk after 60. Azithromycin loses on the same QT concern, supported by a cohort study of cardiovascular death. Amoxicillin alone loses because comorbidities move guidance to combination therapy. Later sections handle interactions, a cephalosporin fallback, a Thursday call and a Friday visit, home glucose checks and counseling.
Where the points sit in the NR 565 Week 3 rubric
Rationales are usually assessed on whether rival agents appear and lose for patient-specific reasons, whether the prescription is complete, whether follow-up is dated and whether citations support the prescribing claims. An uncontested winner reads as a lookup and is the most common weak submission, so three named losers are central here. Each falls on a different finding in the chart, which shows the writer considered a field rather than one objection. A complete order with dose, interval, duration and administration details can actually be followed. Follow-up with a day and a measurable threshold replaces vague ongoing monitoring. Counseling in patient language shows the plan will work outside the clinic. Guideline and trial references attached to the antibiotic choices satisfy the evidence criterion.
NR 565 Week 3 help: mistakes that cost points
The commonest weakness is choosing the right drug without showing that any other agent was considered. Another is rejecting alternatives for side effects nobody in the case has, instead of for something in this patient's chart. Many papers end with ongoing monitoring rather than a named test and a date. A few dose the drug as if the creatinine clearance quoted at the start did not exist. Others address counseling to a colleague. Citations often support the diagnosis rather than the drug choice. State the goal, write the full order, give each rival a paragraph with a chart-based reason and set a follow-up day with a threshold. If your patient has a different infection or condition, describe the case and the medication list, and a rationale can be written for it.
Get a NR 565 Week 3 example written to your instructions
Send the Week 3 case your classroom assigned, along with the rubric if one was posted, and an example rationale is written against them and returned inside 24 to 48 hours, free the first time. It arrives with the rejected agents argued out, so the comparative half is visible rather than implied.
More NR 565 papers and MSN samples
- NR 565 Week 1: Pharmacokinetics Discussion Post
- NR 565 Week 2: Thiazide Drug Class Write-Up
- NR 565 Week 4: Case Analysis
- NR 565 Week 5: Sample Paper, in Real Form
- NR 565 Week 6: Patient Education Handout
- NR 565 Week 7: Case Analysis
- NR 565 Week 8: Prescribing Rationale
- NR 545 Week 3: Focused Exam Write-Up
- NR 509 Week 3: Focused Exam Write-up
- NR 507 Week 1: Discussion Post
NR 565 Week 3 questions, answered
How many alternatives should be rejected?
Two or three is the usual expectation and more is rarely better. What earns points is the quality of each rejection and not the count. An alternative dismissed on a reason taken from this patient's chart outweighs several dismissed with textbook cautions, and a fourth agent added for volume tends to attract a reason that will not survive close reading.
Does the rationale need a mechanism paragraph?
It needs mechanism only where mechanism decides something. A sentence explaining why one agent's elimination route matters for these kidneys is doing work; a standalone account of receptor binding is not, and pathophysiology is another course's subject. The test is simple. If deleting the sentence leaves the choice equally well defended, the sentence was not part of the defense.
What if two agents are genuinely equivalent?
Say so, then break the tie on something real. Price, dosing frequency, the patient's ability to attend for bloodwork, formulation, or a clash with something already prescribed will separate almost any pair. An honest tie broken on a practical constraint reads as prescribing, while a claim of clinical superiority the evidence does not support reads as guessing and is easy to spot.
Where can I find a free NR 565 Week 3 sample paper?
The pneumonia rationale above, with three rival agents rejected for reasons in the patient's chart, is the full NR 565 Week 3 sample. A rationale for your own case can be drafted from its details.
How many alternatives does the NR 565 Week 3 rationale need?
Usually two or three, each with its own paragraph and its own reason tied to the patient, such as a drug interaction, organ function or a comorbidity.