Can duloxetine cause kidney stones?

Duloxetine Does Not Cause Kidney Stones

Duloxetine is not known to cause kidney stones. The FDA drug label for duloxetine does not list kidney stone formation as a recognized adverse effect, and there is no evidence linking this medication to nephrolithiasis 1.

What the Evidence Shows

FDA Drug Label Information

The official duloxetine prescribing information extensively details renal considerations, but these relate to drug metabolism and clearance in patients with existing kidney disease, not stone formation 1:

• Severe renal impairment (GFR <30 mL/min): Avoid use due to accumulation of drug metabolites
• End-stage renal disease: 100% increase in drug exposure with hemodialysis
• Urinary hesitation and retention: Recognized adverse effects, but these are functional bladder issues, not stone formation 1

Drug-Induced Kidney Stones: The Actual Culprits

When medications do cause kidney stones, they fall into two categories 2:

1. Poorly soluble drugs that crystallize in urine (1-2% of all kidney stones):

   • Protease inhibitors (atazanavir)
   • Sulphadiazine
   • Ceftriaxone
   • Ephedrine preparations

2. Drugs causing metabolic stone formation:

   • Calcium/vitamin D supplements
   • Carbonic anhydrase inhibitors (acetazolamide, topiramate)

Duloxetine is not listed among these stone-forming medications 2.

Important Caveat: Acute Kidney Injury

While duloxetine does not cause stones, there is a 2026 case report of acute kidney injury (AKI) in a patient taking duloxetine 3. This presented as:

• Mental lethargy and disorientation
• Marked azotemia with reduced GFR
• Resolution after drug discontinuation

This represents renal dysfunction, not stone formation—a completely different pathophysiology.

Clinical Bottom Line

If a patient on duloxetine develops kidney stones, look for the actual common causes 4:

• Dehydration and low fluid intake
• Dietary factors (high sodium, oxalate, animal protein)
• Metabolic disorders (hypercalciuria, hyperoxaluria)
• Other medications (see list above)
• Genetic predisposition (45% heritability)

Do not attribute stone formation to duloxetine. The medication may need adjustment for severe renal impairment, but it is not a lithogenic agent.