7. Metformin (In Specific Situations)

Why it’s nuanced: Metformin is a first-line diabetes medication that’s generally safe and even kidney-protective long-term. However, in people with severely reduced kidney function (eGFR <30), it can rarely contribute to lactic acidosis.
✅ Safer approach:
  • Get regular eGFR tests if you take metformin
  • Never stop diabetes medication without consulting your provider
  • Stay hydrated, especially during illness or before procedures involving contrast dye
  • Know that guidelines have expanded—many people with mild-moderate kidney disease can safely continue metformin

8. Herbal Supplements Containing Aristolochic Acid or High-Dose Licorice

Why they’re risky: Some traditional remedies (like certain Chinese herbs containing aristolochic acid) are directly toxic to kidneys and linked to irreversible damage. Licorice root in high doses can raise blood pressure and lower potassium, straining kidneys.
✅ Safer approach:
  • Always tell your doctor about any supplements you take
  • Buy supplements from reputable brands that test for contaminants
  • Avoid products with “aristolochia,” “birthwort,” or unlabeled herbal blends
  • Remember: “natural” doesn’t automatically mean “safe for kidneys”

💡 Protecting Your Kidneys: Practical Steps You Can Take Today

You don’t have to live in fear of medications. Instead, partner with your healthcare team:
✨ Keep an updated medication list: Include prescriptions, OTC drugs, and supplements. Share it at every appointment.
✨ Ask the right questions: Before starting a new med, ask: “How might this affect my kidneys?” and “What monitoring do I need?”
✨ Stay hydrated: Water helps kidneys flush medications safely. Aim for pale yellow urine as a general guide.
✨ Get regular check-ups: A simple blood test (creatinine/eGFR) and urine test can catch kidney changes early.
✨ Manage underlying conditions: Controlling blood pressure, diabetes, and heart health is one of the best ways to protect your kidneys long-term.

Frequently Asked Questions

Can I ever take NSAIDs if I have kidney concerns? Sometimes—short-term, low-dose use under medical guidance may be acceptable. But always discuss alternatives first.
Are generic medications harder on kidneys than brand-name? No. Generic and brand-name drugs contain the same active ingredients. Kidney risk depends on the drug itself, not the label.