Why you should avoid NSAIDs when dehydrated
Dehydration is tough on your body, and taking common pain relievers like ibuprofen (Advil, Motrin) or naproxen (Aleve) during this time can put extra stress on your kidneys. These medications, known as NSAIDs (nonsteroidal anti-inflammatory drugs), can increase your risk of acute kidney injury (AKI)—a sudden drop in kidney function—especially when you’re low on fluids.
How Do NSAIDs Hurt Your Kidneys When You’re Dehydrated?
When you’re dehydrated, your body works hard to maintain blood flow to vital organs, including your kidneys. Normally, your kidneys rely on certain hormones (called prostaglandins) to keep blood flowing properly. NSAIDs block these hormones, which can:
- Reduce blood flow to the kidneys
- Lead to kidney damage, even in healthy people
- Cause symptoms like decreased urination, swelling, fatigue, or confusion
Who’s Most at Risk?
While anyone can be affected, certain groups are especially vulnerable:
- Children – Studies show that dehydrated kids given ibuprofen are twice as likely to develop kidney problems.
- Older adults – Age-related kidney changes increase risk.
- People with existing kidney disease, heart failure, or high blood pressure
- Those taking diuretics (“water pills”) or blood pressure medications
Other Possible Complications
Besides kidney injury, NSAIDs during dehydration can also cause:
- Fluid retention (swelling)
- High blood pressure
- High potassium levels (which can affect heart rhythm)
- In rare cases, severe kidney damage
What Should You Do Instead?
- Stay hydrated – Drink plenty of water, especially if you’re sick, exercising, or in hot weather.
- Avoid NSAIDs when dehydrated – If you need pain relief, consider acetaminophen (Tylenol) instead (but check with your doctor first).
- Use the lowest effective dose for the shortest time – If you must take NSAIDs, don’t overdo it.
- Watch for warning signs – Dark urine, dizziness, or little to no urination mean you should seek medical help.
Bottom Line
NSAIDs are helpful for pain and inflammation, but they can be dangerous when your body is low on fluids. Play it safe—hydrate first, and choose pain relievers wisely. If you have kidney issues or other health concerns, talk to your doctor before using NSAIDs.
Sources:
1.Non-Steroidal Anti-Inflammatory Drugs: Clinical Implications, Renal Impairment Risks, and AKI. LaForge JM, Urso K, Day JM, et al. Advances in Therapy. 2023;40(5):2082-2096. doi:10.1007/s12325-023-02481-6.
2. Nephrotoxicity of Nonsteroidal Anti-Inflammatory Drugs: Physiologic Foundations and Clinical Implications. Whelton A. The American Journal of Medicine. 1999;106(5B):13S-24S. doi:10.1016/s0002-9343(99)00113-8.
3. Acute Kidney Injury Associated With Non-Steroidal Anti-Inflammatory Drugs. Klomjit N, Ungprasert P. European Journal of Internal Medicine. 2022;101:21-28. doi:10.1016/j.ejim.2022.05.003.
2. Nephrotoxicity of Nonsteroidal Anti-Inflammatory Drugs: Physiologic Foundations and Clinical Implications. Whelton A. The American Journal of Medicine. 1999;106(5B):13S-24S. doi:10.1016/s0002-9343(99)00113-8.
4. Nephrotoxicities of Nonsteroidal Anti-Inflammatory Drugs. Wen SF. Journal of the Formosan Medical Association = Taiwan Yi Zhi. 1997;96(3):157-71.
5. Renal Toxicity of the Nonsteroidal Anti-Inflammatory Drugs. Murray MD, Brater DC. Annual Review of Pharmacology and Toxicology. 1993;33:435-65. doi:10.1146/annurev.pa.33.040193.002251. Leading Journal
6. Ibuprofen-Associated Acute Kidney Injury in Dehydrated Children With Acute Gastroenteritis. Balestracci A, Ezquer M, Elmo ME, et al. Pediatric Nephrology (Berlin, Germany). 2015;30(10):1873-8. doi:10.1007/s00467-015-3105-7.
7. Using NSAID in Volume Depleted Children Can Precipitate Acute Renal Failure. John CM, Shukla R, Jones CA. Archives of Disease in Childhood. 2007;92(6):524-6. doi:10.1136/adc.2006.103564.
8. Prevention of Renal Complications Induced by Non- Steroidal Anti-Inflammatory Drugs. Ković SV, Vujović KS, Srebro D, Medić B, Ilic-Mostic T. Current Medicinal Chemistry. 2016;23(19):1953-64. doi:10.2174/0929867323666160210125920.
9. Wilderness Medical Society Clinical Practice Guidelines for the Treatment of Acute Pain in Austere Environments: 2024 Update. Fink PB, Wheeler AR, Smith WR, et al. Wilderness & Environmental Medicine. 2024;35(2):198-218. doi:10.1177/10806032241248422.
