Kidney Health

Supplements & OTCs May Hurt Your Kidneys

How well are your kidneys working?

Unless you’ve had problems in the past, you probably take for granted that your kidneys are working as they should. But more than one in 10 adults in the United States has kidney disease, and most people who have it don’t know it.

Even more alarmingly, over-the-counter medicines, common prescriptions, and nutritional supplements can have serious effects on kidney function, especially if your kidneys aren’t completely healthy to begin with, says Robert Heyka, MD, Interim Chair of Cleveland Clinic’s Department of Nephrology & Hypertension.

Only your doctor can determine whether your kidneys are healthy. However, there are certain other health problems that make a person more likely to have kidney disease.

Health conditions that require kidney screenings

If you have one of these health conditions, or if you or your family has a history of kidney problems, it’s important to have your kidneys checked once a year:

• Diabetes

• High blood pressure

• Heart disease

• Obesity

• High cholesterol

But even if you don’t have any risk factors, a yearly check-up with lab and urine tests is the only way to get a clear picture of your kidney function, says Dr. Heyka.

The drugs and supplements that should cause concern

The following are drugs and supplements that can put added pressure on kidney function:

1. NSAIDS (Non-steroidal anti-inflammatory drugs)

Taking NSAIDS can affect blood flow through the kidneys, and can cause damage, especially if you’re also taking diuretics (“water pills”) or ACE inhibitors.

NSAIDS include over-the-counter painkillers like aspirin (Ascriptin®, Bayer® and Ecotrin®), ibuprofen (Advil®, and Motrin®), and naproxen (Aleve®).

They also include prescription drugs like:

• Naproxen sodium (Anaprox®)

• Celecoxib (Celebrex®)

• Sulindac (Clinoril®)

• Oxaprozin (Daypro®)

• Salsalate (Disalcid®)

• Diflunisal (Dolobid®)

• Piroxicam (Feldene®)

• Indomethacin (Indocin®)

• Etodolac (Lodine®)

• Meloxicam (Mobic®)

• Naproxen (Naprosyn®)

• Nabumetone (Relafen®)

• Ketorolac tromethamine (Toradol®)

• Naproxen/esomeprazole (Vimovo®)

• Diclofenac (Voltaren®)

Use of these medications with caffeine can also further harm your kidneys. Also, when taking these medications, be sure to check with your doctor if you have impaired kidney function.

2. Antibiotics

Certain antibiotics are removed from the body through the kidneys, so taking them can put extra strain on your renal system. Penicillin, cephalosporins and sulfonamides in particular can be harmful to your kidneys.

Over time, long-term antibiotic use can injure your kidneys, even if you’re otherwise healthy. And for people whose kidneys aren’t functioning at 100 percent to begin with, antibiotics can build up in the body and cause damage.

Despite this, it’s important to keep in mind that antibiotics can be safely used if needed as long as the dose is adjusted for your body’s level of kidney function.

3. Dietary supplements

Certain herbs or nutritional supplements have been associated with kidney injury, even among healthy people. With such a wide variety of supplements available, the best way to get advice about a particular supplement is to ask your doctor to review all the ingredients to be sure it’s safe to use.

Dietary supplements aren’t regulated by the Food and Drug Administration. Their manufacturers don’t have to prove that they are safe to use, and ingredients can vary from one brand to the next.

A review published by researchers at Brigham and Women’s Hospital in April, 2012, cites 17 dietary supplements that have been associated with direct kidney injury, though in a very limited numbers of cases.

Of note, researchers found that patients often do not tell their doctors about the dietary supplements they are taking, and this could put them at risk for injury and drug interactions.

If you already have diminished kidney function or are at risk for kidney disease, there’s a risk of serious injury if you take dietary supplements – including vitamin doses above the Recommended Daily Allowance (RDA).

Are you at risk for kidney disease

Most people with kidney disease don’t have any symptoms until they’re very sick. So unless your doctor has tested your kidney function, you can’t know whether you’re safe using ibuprofen for sore muscles, for example.

A few simple tests will tell your doctor how well your kidneys are working. He or she will:

• Check your blood pressure

• Take a blood sample and test the levels of blood urea nitrogen (BUN) and creatinine, which are good indicators of how well your kidneys are filtering your blood

• Take a urine sample to check for blood or protein in your urine

Even slightly higher than normal blood pressure or cholesterol increases your risk for kidney disease, stresses Dr. Heyka. So keep your blood pressure, cholesterol, and weight in check, along with your blood sugar if you are diabetic. And, as always, make sure you tell your doctor about every vitamin, herbal remedy, and nutritional supplement you take.

This article originally appeared on HealthHub from Cleveland Clinic.

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