what is the therapeutic action of phenytoin
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Nursing Elites

ATI RN

ATI Pharmacology Proctored Exam 2024

1. What is the therapeutic action of Phenytoin?

Correct answer: B

Rationale: Phenytoin is primarily used as an anticonvulsant to prevent and control seizures. It works by stabilizing electrical activity in the brain, making it effective in managing conditions like epilepsy. Antidiabetic medications are used to regulate blood sugar levels, mood stabilizers help manage mood disorders, and antianxiety agents are used to reduce anxiety symptoms, none of which are the primary therapeutic action of Phenytoin.

2. A client is prescribed an IM dose of penicillin. She reports developing a rash after taking penicillin 3 years ago. What action should the healthcare professional take?

Correct answer: B

Rationale: The healthcare professional should withhold the medication and notify the provider of the client's previous reaction to penicillin. It is crucial to report any past allergic reactions to medications, as this information guides the provider in prescribing a safe alternative. Administering the prescribed dose without considering the client's history of developing a rash can lead to potentially severe adverse reactions. Changing the prescription to an oral form or administering an oral antihistamine does not address the risk of an allergic reaction to penicillin in this case.

3. A client is reviewing a new prescription for Terbutaline with a history of preterm labor. Which of the following client statements indicates understanding of the teaching?

Correct answer: C

Rationale: The correct answer is C. The client should report increasing intensity, frequency, or duration of contractions to the provider as these are signs of preterm labor. Monitoring contractions is crucial for the management of preterm labor and the safety of both the client and the fetus. Choices A, B, and D are incorrect because increasing activity, fluid intake, or assuming the medication will prevent preterm labor do not address the essential need to report changes in contractions, which are a vital sign of potential complications in preterm labor.

4. A client has a prescription for Desmopressin for the treatment of Diabetes Insipidus. Which of the following instructions should the nurse include in the teaching?

Correct answer: A

Rationale: Desmopressin is a medication used to reduce diuresis in clients with diabetes insipidus. To prevent water intoxication, clients should be advised to decrease fluid intake at the beginning of treatment. This instruction helps to balance fluid levels in the body and prevent potential complications associated with excessive fluid intake while on Desmopressin therapy. Monitoring for signs of fluid retention, such as weight gain, and adjusting fluid intake accordingly are essential components of client education when initiating treatment with Desmopressin.

5. Potassium-sparing diuretics primarily affect which part of the kidney?

Correct answer: D

Rationale: Potassium-sparing diuretics exert their primary effects on the distal convoluted tubule in the kidney. By acting on this specific part of the nephron, these diuretics promote sodium excretion while sparing potassium, thus helping to maintain potassium levels in the body. This mechanism differs from other diuretics that may cause potassium loss as a side effect. Understanding the site of action of potassium-sparing diuretics is crucial in clinical practice for managing conditions like hypertension and edema where diuresis is necessary without the risk of hypokalemia.

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