furosemide and ibuprofen

Pharmacodynamic and pharmacokinetic: Ibuprofen inhibits renal prostaglandin synthesis, reducing renal blood flow and glomerular filtration, which diminishes the diuretic and natriuretic effects of furosemide. Additionally, ibuprofen may competitively inhibit the renal tubular secretion of furosemide via organic anion transporters, further reducing its efficacy.

Patients may experience diminished diuresis, worsening oedema, elevated blood pressure, and decreased renal function. The risk of acute kidney injury is increased, particularly in patients with heart failure, cirrhosis, pre-existing renal impairment, or those receiving concurrent ACE inhibitors, angiotensin receptor blockers, or other nephrotoxic agents.

Avoid chronic co-administration if possible. If required, monitor renal function, blood pressure, and fluid balance at baseline and periodically thereafter. Use the lowest effective ibuprofen dose for the shortest duration, and consider alternative analgesia such as paracetamol when appropriate. Adjust the furosemide dose as needed to maintain adequate diuresis.

Well-established interaction, supported by pharmacodynamic studies and extensive clinical observation. Commonly listed in standard drug interaction references and considered clinically significant.