Nokea
Which of the following best describes the effect of propylthiouracil on thyroid hormone production?
- A. It blocks the release of thyrotropin-releasing hormone
- B. It inhibits uptake of iodide by thyroid cells
- C. It prevents the release of thyroid hormone from thyroglobulin
- D. It blocks iodination and coupling of tyrosines in thyroglobulin to form thyroid hormones
Correct Answer: D
Rationale: Propylthiouracil blocks iodination and coupling in thyroglobulin, inhibiting thyroid hormone synthesis.
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T½ of a drug can determine all the following
- A. Closing interval
- B. Elimination time
- C. Steady Plasma Concentration
- D. Therapeutic dosage
Correct Answer: D
Rationale: Half-life (t½) informs dosing intervals to maintain therapeutic levels.
Patients who are being treated with epoetin alfa need to be monitored for the development of:
- A. Thrombocytopenia
- B. Neutropenia
- C. Hypertension
- D. Gout
Correct Answer: C
Rationale: Epoetin alfa can cause hypertension by increasing red cell mass; blood count issues or gout are less common.
Which of the following legislative acts allowed the Food and Drug Administration (FDA) to tighten control over the quality of drugs and required that safety and efficacy standards be established?
- A. Pure Food and Drug Act of 1906
- B. Federal Food, Drug, and Cosmetic Act of 1938
- C. Durham Humphrey Amendment of 1951
- D. Kefauver-Harris Act of 1962
Correct Answer: D
Rationale: The Kefauver-Harris Act was the result of the use of the 1960s drug thalidomide (Thalomid). The public concern led to the legislation that gave the FDA regulatory control over testing and evaluating of drugs and allowed it to set standards for efficacy and safety. The Pure Food and Drug Act required labeling to eliminate false claims. The Federal Food, Drug, and Cosmetic Act gave the FDA the power to enforce standards for testing drug toxicity and monitoring labeling. The Durham-Humphrey Amendment enforced prescriptions for distribution.
Which of the following is an advantage of sublingual administration?
- A. Rapid absorption
- B. Convenient
- C. Avoid harsh GI environment
- D. Avoid first pass-metabolism
Correct Answer: D
Rationale: Sublingual administration offers rapid absorption , convenience , avoids the GI tract , and bypasses first-pass metabolism ; all are true, but D is a key pharmacological advantage.
The nurse is explaining how medications work to a group of peers and explains that disruption of a single step in any enzyme system disrupts what?
- A. Cell life
- B. Cell membrane
- C. Cell receptor sites
- D. Cell function
Correct Answer: D
Rationale: If a single step in one of the many enzyme systems is blocked, normal cell function is disrupted. Cell life and cell membrane may be impacted by disruption of some enzymes but not all enzymes. Receptor sites would not be disrupted by disruption in a single step in the enzyme system.