ATI LPN
Pharmacology and the Nursing Process 10th Edition Test Bank
Chapter 31 : Thyroid and Antithyroid Drugs Questions
Question 1 of 5
A patient has been taking levothyroxine for more than one decade for primary hypothyroidism. Today she calls because she has a cousin who can get her the same medication in a generic form from a pharmaceutical supply company. Which is the nurse's best advice?
Correct Answer: D
Rationale: Switching levothyroxine brands can affect thyroid function stability due to potential bioavailability differences, requiring monitoring and physician approval. Consistency is important, but switching is not absolutely prohibited.
Question 2 of 5
A patient has a diagnosis of primary hypothyroidism. Which statement accurately describes this problem?
Correct Answer: C
Rationale: Primary hypothyroidism results from thyroid gland dysfunction, impairing hormone production. Secondary hypothyroidism involves pituitary dysfunction, tertiary involves hypothalamic issues, and iodine deficiency is a specific cause, not the general definition.
Question 3 of 5
A 19-year-old woman has been diagnosed with hypothyroidism and has started thyroid replacement therapy with levothyroxine. After 6 months, she calls the nurse to say that she feels better and wants to stop the medication. Which response by the nurse is correct?
Correct Answer: D
Rationale: Hypothyroidism typically requires lifelong levothyroxine therapy to maintain normal thyroid function, as abrupt discontinuation can lead to symptom recurrence. The other options are incorrect.
Question 4 of 5
Levothyroxine has been prescribed for a patient with hypothyroidism. The nurse reviews the patient's current medications for potential interactions. Which of these drugs or drug classes interact with levothyroxine? (Select all that apply.)
Correct Answer: A,B,D,F
Rationale: Levothyroxine interacts with phenytoin, estrogens, warfarin, and iron supplements, which can alter its absorption or metabolism, affecting thyroid function. Beta blockers and penicillins do not have significant interactions.
Question 5 of 5
The nurse is giving morning medications. The Medication Administration Record has an order for levothyroxine, 88 mcg PO. The drug-dispensing cabinet contains levothyroxine tablets in milligram strengths instead of micrograms. Calculate the milligram equivalent dose of 88 mcg.
Correct Answer: 0.088 mg
Rationale:
To calculate: 1000 mcg/1 mg = 88 mcg/x mg. Cross-multiply: (1000 * x) = (1 * 88); 1000x = 88; x = 88/1000 = 0.088 mg.