NU553 Midterm Key Points: Essential Prescribing Concepts and Drug Management

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Purdue University Globle 

NU553 Advanced Pharmacology and Pharmacotherapeutics

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NU553 Midterm Study Guide: 

Success on the NU553 Midterm depends on understanding safe prescribing practices, pharmacology, disease-specific treatment guidelines, patient assessment, and evidence-based clinical decision-making. The most frequently tested concepts include pharmacokinetics, antimicrobial therapy, psychiatric medications, pain management, dermatology, allergy and infectious diseases, respiratory disorders, cardiovascular pharmacology, and prescribing considerations across special populations such as children, pregnant women, and older adults. This guide organizes the essential concepts into an evidence-based, easy-to-review format for nursing students and advanced practice nurses.

Week 1: Safe Prescribing and Clinical Pharmacology

An accurate diagnosis is the foundation of safe prescribing. Selecting the appropriate medication depends on identifying the correct disease process while considering patient-specific factors such as age, kidney and liver function, pregnancy status, genetics, and concurrent medications.

Principles of Safe Prescribing

Healthcare providers should remember the following essential prescribing principles:

• Always establish an accurate diagnosis before prescribing medication.

• Write complete prescriptions with all legally required components.

• Encourage patients to use community drug take-back programs for disposal of unused medications.

• Schedule II controlled substances require a new prescription for every refill because refills are not permitted.

• Pediatric medication doses should always be calculated using body weight in kilograms (kg) to reduce dosing errors.

• During breastfeeding, medications with shorter half-lives are generally preferred because they reduce infant exposure.

• Fetuses become particularly vulnerable to teratogenic medications during early organ development, making medication selection critical during pregnancy.

NU553 Midterm Key Points: Essential Prescribing Concepts and Drug Management

Pharmacokinetics and Drug Distribution

Drug effectiveness depends on absorption, distribution, metabolism, and elimination.

Important pharmacokinetic concepts include:

• Intravenous (IV) medications have 100% bioavailability because they enter systemic circulation directly.

• Older adults, edema, and poor vascular circulation may alter the volume of distribution.

• Drugs that bind to the same plasma proteins can displace one another, increasing free drug concentrations and toxicity risk.

• Agonists bind to receptors and activate a physiological response.

Pharmacogenomics and Individualized Therapy

Pharmacogenomics studies how inherited genetic differences affect medication response.

Examples include:

• CYP2C9 genetic variations may reduce warfarin metabolism.

• Patients with therapeutic INR values that remain unstable despite good adherence may benefit from genetic testing.

• Genetic testing supports individualized medication therapy and improves safety.

Antimicrobial Therapy

Successful antibiotic prescribing requires appropriate diagnosis and organism identification whenever possible.

Best practices include:

• Obtain culture and sensitivity testing whenever feasible before initiating antibiotic therapy.

• Modify therapy if the organism demonstrates resistance.

• Oral vancomycin is recommended for Clostridioides difficile infection because it acts locally within the gastrointestinal tract.

• Tuberculosis medications may cause peripheral neuropathy, which can often be prevented with supplemental pyridoxine (vitamin B6).

• Tetracycline antibiotics increase photosensitivity, making sun protection important.

• Zidovudine-related gastrointestinal upset may improve when taken with a small amount of food.

Polypharmacy and Medication Safety

Older adults are especially vulnerable to medication-related complications.

Risk factors include:

• Multiple healthcare providers

• Numerous chronic diseases

• Prescribing medications to treat adverse effects of other medications

• Medication stockpiling

A therapeutic interchange occurs when one medication is substituted for another therapeutically equivalent drug with provider approval, often because of insurance coverage.

Week 2: Psychiatric Pharmacology and Pain Management

Medication selection for mental health disorders should consider age, symptoms, comorbidities, adverse effects, and patient preferences.

Antidepressant Selection

Common medication choices include:

Important Clinical Considerations

Providers should recognize these important prescribing precautions:

• Fluoxetine is considered an appropriate first-line SSRI for school-aged children with depression.

• Duloxetine may precipitate manic episodes in patients with bipolar disorder.

• St. John’s Wort interacts with anticoagulants and many other medications.

• Nursing home residents have an increased risk of depression.

• SSRIs remain first-line therapy for most depressive disorders.

ADHD and Neurologic Disorders

Important treatment recommendations include:

• Methylphenidate remains a first-line medication for school-aged children with ADHD.

• Bupropion may also improve ADHD symptoms in selected adults.

• Risk factors for ADHD include parental smoking, low birth weight, and family history.

• Pramipexole is commonly recommended as first-line treatment for restless legs syndrome.

Pain Management

Treatment should match the underlying pain mechanism.

Examples include:

• Acetaminophen is appropriate for mild pain.

• Duloxetine effectively treats neuropathic low back pain.

• Gout produces nociceptive pain.

• Chronic opioid therapy commonly causes constipation.

• Methadone carries increased risk for respiratory depression during medication-assisted treatment.

• Management of opioid use disorder should include evaluation of previous treatment, social support, and psychiatric comorbidities.

Patients with hypertension, congestive heart failure, or peptic ulcer disease require careful evaluation before NSAID therapy.

Week 3: Dermatology and Infectious Diseases

Skin disorders often have characteristic clinical findings that guide therapy.

Common Skin Disorders

Older adults with contact dermatitis frequently present with scaling rather than erythema.

Acne Pharmacology

Patients receiving isotretinoin must participate in the iPLEDGE program because of significant teratogenic risk.

When tretinoin causes excessive irritation, decreasing application to every other night often improves tolerability.

Eye and Ear Infections

Common treatment approaches include:

• Erythromycin ophthalmic ointment for bacterial conjunctivitis

• Antibiotic ear drops for otitis externa

• Oral amoxicillin as first-line treatment for otitis media

• Cefdinir is an alternative for patients with penicillin allergy.

Immunomodulating Therapy

Before initiating biologic medications such as infliximab:

• Screen for latent tuberculosis.

• Perform TB skin testing or interferon-gamma release assays.

• Monitor for opportunistic infections.

Maintaining good glycemic control significantly reduces diabetic foot infections.

Week 4: Allergy, Hematology, Infectious Disease, and Anticoagulation

Allergic Disorders

Management begins with allergen avoidance whenever possible.

Additional recommendations include:

• Anaphylaxis is a Type I hypersensitivity reaction.

• Cetirizine 2.5 mg is appropriate for many four-year-old children.

• MAO inhibitors should never be combined with pseudoephedrine because of hypertensive risk.

• Oral fexofenadine may be considered when intranasal corticosteroids fail.

Hematologic Disorders

Key clinical facts include:

• Cyanocobalamin treats pernicious anemia.

• Folate deficiency during pregnancy increases neural tube defect risk.

• Iron deficiency anemia requires iron replacement rather than routine multivitamins.

HIV and Hepatitis

Important prescribing concepts include:

• Sexual transmission remains the most common route of HIV infection.

• HIV pre-exposure prophylaxis (PrEP) must be taken daily for maximum effectiveness.

• Protease inhibitors are associated with lipodystrophy.

Organ Transplantation

Key considerations include:

• Human leukocyte antigen (HLA) compatibility strongly influences rejection risk.

• Cyclosporine may cause gingival hyperplasia with swollen, bleeding gums.

Anticoagulation

Evidence-based anticoagulation management includes:

• Warfarin requires INR monitoring.

• Elevated INR typically requires temporarily withholding warfarin.

• Low D-dimer values help exclude thromboembolism in low-risk patients.

• PERC criteria assist clinicians in determining whether pulmonary embolism testing is necessary.

• Direct oral anticoagulants should not be used in patients with mechanical heart valves.

Week 5: Respiratory Disorders

Evidence-based respiratory management improves long-term outcomes and reduces exacerbations.

Upper and Lower Respiratory Infections

Key recommendations include:

• Amoxicillin-clavulanate (Augmentin) is first-line therapy for acute bacterial sinusitis.

• Community-acquired pneumonia commonly presents with cough, fever, tachycardia, dyspnea, and chest X-ray infiltrates.

• Patients with comorbidities may require broader antimicrobial coverage.

Asthma Management

Current management focuses on reducing airway inflammation.

Important therapies include:

• Inhaled corticosteroids remain the cornerstone of long-term asthma control.

• Budesonide-formoterol is preferred as needed for many patients with mild intermittent asthma.

• Montelukast blocks leukotriene D4 receptors.

• Prednisone bursts are commonly used during acute exacerbations.

COPD Management

Treatment priorities include:

• Smoking cessation to slow disease progression.

• Bronchodilators as first-line maintenance therapy.

• Annual influenza vaccination unless contraindicated.

• Symptom scores and severity classifications guide treatment escalation.

Medication Safety

Important prescribing reminders include:

• Fluoroquinolones carry a boxed warning for tendon rupture.

• Oseltamivir shortens influenza duration when initiated promptly.

• Azithromycin may prolong the QT interval.

• Over-the-counter intranasal epinephrine products may increase blood pressure.

Week 6: Cardiovascular Pharmacology

Management of cardiovascular disease relies on selecting medications based on guideline-directed therapy and patient-specific contraindications.

Hypertension

Important antihypertensive medications include:

ACE inhibitors and ARBs are contraindicated in bilateral renal artery stenosis.

Safe antihypertensive medications during pregnancy include:

• Labetalol

• Hydralazine

• Methyldopa

Heart Failure

Evidence-based management includes:

• ACE inhibitors reduce morbidity and mortality.

• Digoxin may be added in selected patients with reduced ejection fraction despite optimized therapy.

• Spironolactone should not be used in patients with hyperkalemia.

Lipid Management

Statins remain first-line therapy for dyslipidemia.

Key concepts include:

• Statins inhibit HMG-CoA reductase.

• Atorvastatin may reduce LDL cholesterol by approximately 60%.

• Liver function should be monitored during statin therapy.

• HDL assists in transporting cholesterol to the liver for removal.

Cardiovascular Emergencies

Providers should remember:

• Obtain an ECG immediately in patients presenting with chest pain.

• Patients receiving warfarin who present with suspected stroke require INR assessment before thrombolytic therapy.

• Severe anemia increases heart failure risk.

• Cardiac arrhythmia risk increases with heart failure, cocaine use, alcohol misuse, and certain medications.

For stable supraventricular tachycardia (SVT), vagal maneuvers such as coughing, breath-holding, ice application to the face, or gag reflex stimulation may terminate the arrhythmia before medication therapy.

Evidence-Based Clinical Decision Making

Advanced practice nurses should consistently integrate current clinical practice guidelines into prescribing decisions.

Key principles include:

• Use evidence-based practice guidelines whenever available.

• Schedule regular follow-up appointments to evaluate therapeutic response.

• Monitor laboratory values for medication safety.

• Encourage healthy lifestyle modifications alongside pharmacologic treatment.

• Individualize therapy based on age, comorbidities, genetics, pregnancy status, and patient preferences.

Frequently Asked Questions

What is the first step in safe prescribing?

The first step is establishing an accurate diagnosis. Appropriate medication selection depends on identifying the correct condition and considering patient-specific risk factors.

Why is culture and sensitivity testing important before prescribing antibiotics?

Culture and sensitivity testing identifies the causative organism and determines which antibiotics are most effective, reducing inappropriate antibiotic use and antimicrobial resistance.

Which antidepressant is commonly preferred for children with depression?

Fluoxetine is one of the most evidence-supported SSRIs for treating depression in school-aged children and adolescents.

Why are ACE inhibitors contraindicated during pregnancy?

ACE inhibitors increase the risk of fetal kidney injury and congenital abnormalities, making them unsafe throughout pregnancy.

Why should warfarin therapy be monitored with INR?

INR monitoring ensures that anticoagulation remains within the therapeutic range, reducing both bleeding and thromboembolic complications.

What is the cornerstone of long-term asthma management?

Inhaled corticosteroids remain the primary controller therapy because they reduce airway inflammation and decrease asthma exacerbations.

Early diagnosis, evidence-based prescribing, individualized pharmacotherapy, and ongoing patient monitoring are the cornerstones of advanced nursing practice. Understanding pharmacokinetics, drug interactions, disease-specific guidelines, and patient-centered care helps clinicians improve therapeutic outcomes while minimizing medication-related harm. Regular use of current clinical guidelines and careful follow-up further supports safe, effective, and high-quality prescribing across diverse patient populations.

References

American Diabetes Association. (2025). Standards of care in diabetes—2025. https://diabetesjournals.org/care

Centers for Disease Control and Prevention. (2024). Antibiotic prescribing and use. https://www.cdc.gov/antibiotic-use/

Centers for Disease Control and Prevention. (2024). Adult immunization schedule. https://www.cdc.gov/vaccines/

Global Initiative for Asthma. (2025). Global strategy for asthma management and prevention. https://ginasthma.org/

NU553 Midterm Key Points: Essential Prescribing Concepts and Drug Management

Global Initiative for Chronic Obstructive Lung Disease. (2025). Global strategy for the diagnosis, management, and prevention of COPD. https://goldcopd.org/

Lexicomp. (2025). Drug information handbook. https://www.wolterskluwer.com/en/solutions/lexicomp

Rosenthal, L. D., & Burchum, J. R. (2024). Lehne’s pharmacology for nursing care (12th ed.). Elsevier.

U.S. Preventive Services Task Force. (2024). Recommendation statements. https://www.uspreventiveservicestaskforce.org/

Woo, T. M., & Robinson, M. V. (2024). Pharmacotherapeutics for advanced practice nurse prescribers (6th ed.). F. A. Davis.