A nurse is preparing to administer diphenhydramine 50 mg PO every 6 hours to a client who has acute dystonia.

Available are diphenhydramine 25 mg tablets. How many tablets should the nurse administer per dose?

(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Choice A reason: General anesthesia can cause urinary retention due to its effects on the nervous system, which may temporarily impair the normal re?exes that control urination. This is particularly relevant in the immediate postoperative period.

Choice B reason: While liver failure can have many systemic effects, it is not directly associated with an increased risk of urinary retention. Urinary retention is more commonly related to factors affecting the urinary tract or nervous system.

Choice C reason: A diet high in calcium oxalate can contribute to kidney stones, but it does not directly increase the risk of urinary retention. Urinary retention typically involves an obstruction or nerve dysfunction.

Choice D reason: Antibiotic treatment for a skin infection, even one caused by Staphylococcus aureus, would not typically result in urinary retention. Urinary retention is usually related to urinary tract obstructions, medications, or nerve issues.

Choice A reason: Aluminum hydroxide does not primarily lower serum calcium levels. Calcium levels are typically managed in CKD patients through other medications and dietary restrictions, as hypercalcemia can occur in these patients.

Choice B reason: Aluminum hydroxide acts as a phosphate binder, which helps to lower serum phosphorus levels in patients with CKD. This is important because high phosphorus levels can lead to bone and heart problems in these patients. The normal range for serum phosphorus is approximately 2.5 to 4.5 mg/dL.

Choice C reason: Aluminum hydroxide does not have a significant effect on serum potassium levels. In CKD, potassium levels are managed through diet and other medications due to the risk of hyperkalemia, which can be life- threatening.

Choice D reason: While magaldrate contains magnesium, which could potentially worsen hypermagnesemia in CKD patients, aluminum hydroxide does not lower serum magnesium levels. Instead, it is less likely to cause elevated magnesium levels compared to magaldrate.