what is pharmacodynamics
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Nursing Elites

ATI RN

ATI Proctored Pharmacology 2023

1. What is pharmacodynamics?

Correct answer: B

Rationale: Pharmacodynamics refers to the drug's actions at receptor sites and the physiological, chemical, and behavioral effects produced by these actions. It involves understanding how drugs interact with the body at the molecular level to produce their effects, including mechanisms of action, receptor binding, and downstream physiological responses. Choice A is incorrect because it describes pharmacopeia, which is a reference book containing standards for drugs. Choice C refers to efficacy, which is the maximum effect a drug can produce. Choice D describes pharmacokinetics, which focuses on the movement of drugs within the body.

2. A client who has been taking prednisone to treat asthma is advised to discontinue the medication. The client should be instructed to reduce the dose gradually to prevent which of the following adverse effects?

Correct answer: B

Rationale: Abruptly stopping prednisone can result in adrenocortical insufficiency due to suppression of the adrenal glands. Gradually tapering the dose helps the body adjust and resume its natural cortisol production, preventing adrenal insufficiency. Choice A, hyperglycemia, is a possible adverse effect of prednisone, but it is not the primary reason for gradual tapering. Severe dehydration (Choice C) and rebound pulmonary congestion (Choice D) are not typically associated with discontinuing prednisone.

3. A healthcare provider is providing discharge instructions to a client who is prescribed Enalapril. Which of the following adverse effects should the healthcare provider instruct the client to monitor?

Correct answer: A

Rationale: The correct answer is A: Dry cough. A persistent dry cough is a common adverse effect of Enalapril, an ACE inhibitor. Enalapril can cause a non-productive cough due to its effect on bradykinin levels. The client should be advised to report this symptom to their healthcare provider to consider alternative treatments. Choices B, C, and D are incorrect because weight gain, diarrhea, and nausea are not typically associated with Enalapril use.

4. A client has a prescription for Nitroglycerin, and a nurse is providing teaching. Which of the following instructions should the nurse include?

Correct answer: B

Rationale: The correct instruction for taking Nitroglycerin is to take one tablet at the onset of chest pain, then repeat every 5 minutes for up to three doses. Option A is incorrect because taking a tablet every 15 minutes until pain is relieved may lead to delayed intervention. Option C is incorrect as taking Nitroglycerin at bedtime is not indicated for chest pain. Option D is incorrect as Nitroglycerin should be taken sublingually at the onset of chest pain, not on an empty stomach.

5. A client has a new prescription for Bisacodyl. Which of the following statements should the nurse include?

Correct answer: D

Rationale: The correct statement to include when educating a client about Bisacodyl is to expect rectal burning with the suppository form. Bisacodyl, a stimulant laxative, is known to cause rectal burning when administered as a suppository. This side effect is common and expected, and it is important for the client to be aware of it to prevent unnecessary alarm or concern. Choices A, B, and C are incorrect. Taking Bisacodyl before bedtime is not a common instruction; expecting a rapid heart rate is not a typical side effect of Bisacodyl; and increasing intake of high-sodium foods is not related to the use of Bisacodyl.

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