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How do some over-the-counter pain medications cause/worsen kidney disease? How can patients with kidney disease treat their pain?

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The fact that a number of painkillers are available freely over-the-counter (OTC) often gives a lot of people a false sense of security about the safety of these medications. A statement that I here from some of my patients is, "it was available without a prescription, so I thought it wasn't too strong". So very often, patients assume that if a medicine is not too potent, it probably does not have serious side effects either. Sadly, a medication's potency is not necessarily proportional to its side effect profile.

HOW DO PAIN MEDICATIONS DAMAGE THE KIDNEYS: EFFECTS ON KIDNEY FUNCTION
Pain medications can have different renal effects. These can range from reversible, short term reductions in kidney function due to a decrease in the blood supply to the kidneys (called Acute Renal Failure, or Acute Kidney Injury), to a more chronic disease where the kidneys shrink in size, develop a rough and bumpy surface, and demonstrate tissue breakdown called "papillary necrosi…