Final answer:
Clients with acute pyelonephritis should avoid NSAIDs because they can worsen kidney function. Antibiotics are used to treat the infection, and NSAIDs' potential kidney-damaging effects make them contraindicated.
Step-by-step explanation:
A client who has a diagnosis of acute pyelonephritis should avoid Nonsteroidal anti-inflammatory drugs (NSAIDs). NSAIDs can potentially worsen kidney function and are therefore not recommended for individuals with acute pyelonephritis. Pyelonephritis is a serious kidney infection often caused by bacteria, and while antibiotics are a mainstay of treatment, NSAIDs are avoided due to their potential to cause further kidney damage.
Given that pyelonephritis can advance to acute renal failure or further complicate existing chronic kidney disease, the use of medications that could impair renal function should be minimized or avoided. Antibiotics are used to treat the bacterial infection causing pyelonephritis, whereas NSAIDs are contraindicated.