NR 565 Advanced Pharmacology Fundamentals

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Free NR 565 Advanced Pharmacology Fundamentals Questions

1.

A 45-year-old woman requires levothyroxine for a new diagnosis of hypothyroidism. Her current medications include metoprolol and pravastatin. She also takes calcium carbonate and vitamin D supplements. Which of her medications may affect the levothyroxine dosage requirements?

  • Pravastatin

  • Calcium carbonate

  • Metoprolol

  • Vitamin D

Explanation

Correct Answer:

B. Calcium carbonate

Explanation of Correct Answer

Calcium carbonate can interfere with the absorption of levothyroxine by binding to it in the gastrointestinal tract. This reduces the amount of thyroid hormone absorbed, potentially leading to inadequate treatment and higher levothyroxine dose requirements. Patients should be advised to separate calcium supplementation and levothyroxine administration by at least 4 hours. Pravastatin, metoprolol, and vitamin D do not significantly alter levothyroxine absorption or dosing requirements.


2.

Which of the following diabetic medications are most likely to cause hypoglycemia?

  • biguanides
  • thiazolidinediones (TZDs)
  • sulfonylureas
  • dipeptidyl peptidase-4 inhibitors (DPP4i)

Explanation

Explanation
Correct Answer: C. sulfonylureas
Explanation of Correct Answer
Sulfonylureas stimulate insulin secretion from pancreatic beta cells regardless of blood glucose levels, which significantly increases the risk of hypoglycemia. This risk is higher in elderly patients, those with irregular meal patterns, or those with impaired renal function. Unlike metformin, TZDs, or DPP-4 inhibitors, sulfonylureas directly increase circulating insulin, making hypoglycemia their most common and serious adverse effect, and requiring careful patient education and monitoring.
3.

Which of the following statements best describes the role of Cytochrome P450 (CYP450) enzymes?

  • They are primarily responsible for producing insulin in the pancreas.

  • They are xenobiotic-metabolizing enzymes that detoxify chemicals, metabolize drugs, and help produce cholesterol and steroids.

  • They act as transport proteins that carry oxygen in red blood cells.

  • They function only in the breakdown of carbohydrates for energy production.

Explanation

Correct Answer:

B. They are xenobiotic-metabolizing enzymes that detoxify chemicals, metabolize drugs, and help produce cholesterol and steroids.

Explanation of Correct Answer

CYP450 enzymes are a family of liver enzymes essential for the metabolism of drugs and toxins (xenobiotics). They also play an important role in endogenous processes such as the synthesis of cholesterol, steroid hormones, and vitamin D.


4.

Your breastfeeding patient reports constipation and requests for relief medication. Which medication should be considered?

  • Senna

  • Colace

  • Mineral Oil

  • Miralax

Explanation

Correct Answer:

B. Colace

Explanation of Correct Answer


Colace (docusate sodium) is considered safe for use in breastfeeding patients. It is a stool softener that works by increasing water and fat penetration into the stool, making it easier to pass without significant systemic absorption, thus posing minimal risk to the infant. Senna may cause loose stools in infants, mineral oil can interfere with absorption of fat-soluble vitamins, and while Miralax (PEG 3350) is generally safe, Colace is preferred due to its long-standing safety record in breastfeeding.


5.

Which symptoms are most expected of a patient diagnosed with hypothyroidism?

  • shortness of breath, wheezing, fatigue
  • tachycardia, insomnia, weight loss, goiter
  • irritability, anxiety, dizziness, increased sweating
  • dry pale skin, brittle hair, fatigue, myxedema

Explanation

Correct Answer: D. dry pale skin, brittle hair, fatigue, myxedema

Explanation of Correct Answer
Hypothyroidism results from inadequate thyroid hormone production, slowing metabolic processes. Common symptoms include dry, pale skin due to reduced circulation, brittle hair from impaired protein synthesis, and fatigue caused by slowed metabolism. Myxedema, a hallmark of severe hypothyroidism, presents as swelling with thickened skin and puffiness. These features distinguish hypothyroidism from hyperthyroidism, where symptoms are typically related to increased metabolism such as weight loss, tachycardia, and heat intolerance.

6.

In diabetes, older adults should maintain an A1C

  • less than 8%

  • less than 7%

  • less than or equal to 6.5%

  • less than 10%

Explanation

Correct Answer:

A. less than 8%

Explanation of Correct Answer

For older adults with diabetes, the A1C goal is generally less stringent than in younger populations. An A1C of less than 8% is recommended to balance glycemic control with the risks of hypoglycemia and medication side effects, which can be more harmful in older patients. Individualization is key, but this target helps reduce complications while prioritizing safety and quality of life in aging patients with comorbidities or limited life expectancy.


7.

Of the following, which is not used to diagnose thyroid conditions?

  • Calcitonin
  • TSH
  • Free T4
  • Total T3

Explanation

Correct Answer: A. Calcitonin
Explanation of Correct Answer
Calcitonin is produced by the thyroid gland but is not routinely used to diagnose common thyroid disorders such as hypothyroidism or hyperthyroidism. Instead, it is primarily measured when evaluating medullary thyroid carcinoma or C-cell hyperplasia. Standard thyroid function tests include thyroid-stimulating hormone (TSH), free thyroxine (Free T4), and triiodothyronine (Total T3), which provide direct information about thyroid hormone production and pituitary regulation. Therefore, calcitonin is not a typical diagnostic marker for thyroid conditions.
8.

Extrapyramidal symptoms (EPS) have been associated with which of the following drugs?

  • Metoclopramide
  • Sucralfate
  • Aprepitant
  • Bisacodyl

Explanation

Correct Answer: A. Metoclopramide

Explanation of Correct Answer
Metoclopramide is a dopamine receptor antagonist used as an antiemetic and prokinetic agent. By blocking dopamine receptors in the central nervous system, particularly in the basal ganglia, it can cause extrapyramidal symptoms (EPS), including dystonia, akathisia, parkinsonism, and tardive dyskinesia. These risks increase with long-term or high-dose use. Sucralfate is a mucosal protectant, aprepitant is a neurokinin-1 receptor antagonist, and bisacodyl is a stimulant laxative—none of which are associated with EPS.

9.

When should a TSH level be drawn after adjusting the dose of levothyroxine?

  • after 24 months

  • within 6-8 weeks

  • at least once a year

  • the following week

Explanation

Correct Answer:

B. within 6-8 weeks

Explanation of Correct Answer

TSH levels should be checked within 6–8 weeks after adjusting the dose of levothyroxine because thyroid hormone has a long half-life, and it takes several weeks for levels to stabilize and reflect the new steady state. Checking too early, such as within a week, would not provide accurate information. Once the patient is stable on a maintenance dose, TSH is typically monitored annually unless clinical symptoms or medication changes warrant earlier testing.


10.

Which of the following is a attenuated vaccine?

  • Tdap

  • Polio

  • MMRV

  • Hep B

Explanation

Correct Answer:

C. MMRV

Explanation of Correct Answer

The MMRV vaccine (measles, mumps, rubella, and varicella) is a live attenuated vaccine, meaning it contains weakened forms of the viruses that stimulate immunity without causing disease in healthy individuals. Tdap is an inactivated toxoid vaccine, the inactivated polio vaccine (IPV) is killed virus, and Hepatitis B is a recombinant subunit vaccine. Live attenuated vaccines provide long-lasting immunity but are contraindicated in immunocompromised individuals and pregnant women.


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