Correct Answer: C

Rationale: Atenolol is a beta-blocker that works by slowing down the heart rate. An adverse effect of atenolol is bradycardia, characterized by a slower than normal heart rate. The nurse should instruct the client to monitor for signs of bradycardia, such as a slow heart rate, while taking atenolol. Therefore, the correct answer is to monitor for bradycardia. Tachycardia (Choice A) is not an expected adverse effect of atenolol as it actually reduces heart rate. Hypoglycemia (Choice B) is not a typical adverse effect of atenolol. Hypertension (Choice D) is not an adverse effect of atenolol, as atenolol is commonly used to manage hypertension.

Correct Answer: A

Rationale: Phenobarbital has a long half-life of 4 days, meaning it remains at therapeutic levels in the body for an extended period. Due to this prolonged duration of action, the nurse should expect to administer phenobarbital once a day to maintain therapeutic levels and effectiveness. Administering it more than once a day would lead to unnecessary dosing and potential adverse effects as the medication remains active in the body for an extended period.

Correct Answer: A

Rationale: Corrected Rationale: Hydrochlorothiazide, a diuretic, can lead to electrolyte imbalances, particularly hyponatremia (low sodium levels). The nurse should closely monitor the client's sodium levels due to the potential adverse effect of Hydrochlorothiazide. Incorrect Rationales: - Hyperkalemia (Choice B) is less likely to be caused by Hydrochlorothiazide; in fact, it can lead to hypokalemia. - Hypercalcemia (Choice C) is not a common adverse effect of Hydrochlorothiazide. - Hypoglycemia (Choice D) is not directly associated with Hydrochlorothiazide use.

Correct Answer: A

Rationale: The nurse should instruct the client to take folic acid when receiving treatment with methotrexate to reduce the risk of methotrexate toxicity. Methotrexate acts as a folic acid antagonist, leading to folic acid deficiency, which can be counteracted by supplementing with folic acid. Vitamin D, calcium, and iron are not specifically recommended to counteract methotrexate effects and do not play a significant role in mitigating methotrexate toxicity.

Correct Answer: B

Rationale: The correct information to include when teaching a patient about Omeprazole is that it decreases the production of gastric acid. Omeprazole works by inhibiting the proton pump in the stomach lining, thereby reducing acid secretion. This mechanism helps in managing heartburn symptoms effectively. Choice A is incorrect because Omeprazole is usually taken before a meal. Choice C is incorrect as Omeprazole is typically taken before meals, not after. Choice D is incorrect because hyperkalemia is not a common side effect of Omeprazole.