The nurse is reviewing medications to a patient with acute pyelonephritis. The nurse should contact the treating clinician to clarify the order for which of the following medications?

Acute pyelonephritis is a bacterial infection of the renal pelvis and parenchyma, usually requiring systemic antibiotic therapy to prevent urosepsis. Management requires the administration of antimicrobial agents that reach high concentrations in the urine and renal tissue to effectively eradicate the offending uropathogens. A. Hydroxychloroquine is an antimalarial and immunomodulatory medication used for autoimmune diseases like lupus or rheumatoid arthritis. It has no antimicrobial activity against common uropathogens like E. coli. Ordering this for acute pyelonephritis is a clinical error that would leave the kidney infection entirely untreated. B. Ampicillin is a beta-lactam antibiotic that is frequently used, often in combination with aminoglycosides, for the inpatient treatment of pyelonephritis. It is effective against certain Gram-positive organisms and some Gram-negative strains, making it a standard and appropriate choice for a suspected or confirmed renal infection. C. Ciprofloxacin is a fluoroquinolone antibiotic that is considered a first-line treatment for uncomplicated and complicated pyelonephritis. It has excellent tissue penetration into the kidneys and covers a broad spectrum of Gram-negative bacteria, which are the most common cause of upper urinary tract infections in adults. D. Co-trimoxazole (trimethoprim-sulfamethoxazole) is a sulfonamide antibiotic commonly used to treat urinary tract infections, including pyelonephritis. If local resistance patterns are low, it is an effective oral option for completing a course of therapy for a kidney infection, as it concentrates well within the urinary system.