Moderate
Established
Description
Naproxen reduces the diuretic response to furosemide by inhibiting prostaglandin synthesis, potentially causing fluid retention and worsening edema or heart failure.
Mechanism
Renal prostaglandins mediate part of furosemide's natriuretic action; naproxen-mediated prostaglandin inhibition blunts this response and promotes sodium reabsorption.
Clinical Significance
Clinically relevant in patients with heart failure, nephrotic syndrome, or hepatic cirrhosis where diuretic response is already marginally adequate.
Management
Avoid NSAIDs in patients dependent on furosemide for volume control; if necessary, monitor weight, BP, renal function, and electrolytes closely.