Medication Principles for Protecting Your Kidneys: Review, Don't Cut Back

Reducing your medications on your own because you are concerned about kidney function is not a safe solution. A more accurate principle is to review unnecessary or duplicate medications with your healthcare team and take necessary medications at doses appropriate for your current kidney function. Arbitrarily stopping medications that control blood pressure and blood sugar or slow kidney damage may instead increase your risk.

Do All Medications Burden the Kidneys?

After medications are absorbed, they may be metabolized by the liver or excreted through the kidneys as the original compounds or metabolites. A medication may use both liver and kidney pathways, and the method of excretion varies by ingredient.

When kidney function declines, some medications or active metabolites may remain in the body longer, increasing the risk of side effects. However, the burden on the kidneys cannot be determined solely by the number of medications taken.

• Some medications are barely excreted through the kidneys.
• Appropriate blood pressure and blood sugar treatment can protect the kidneys over the long term.
• Taking duplicate medications with the same ingredient or doses that are too high for your kidney function can cause problems.
• Over-the-counter pain relievers, cold medicines, herbal medicines, or supplements may create overlooked risks even more often than prescription medications.

Therefore, the goal is not simply to reduce the number of medications but to conduct a medication review that checks indications, effectiveness, dosages, duplication, and interactions.

Indicators Used to Assess Kidney Function and Medication Dosage

Chronic kidney disease refers to structural abnormalities or reduced function that persist for a certain period, and the exact diagnostic criteria should be confirmed with your healthcare team. The following information should be considered together when adjusting medications.

Safety cannot be assumed solely because serum creatinine is within the normal range. In particular, older adults with low muscle mass may have reduced kidney function even when their creatinine is not elevated. Because the methods used to calculate kidney function may differ among medication labels, the final dosage must be determined individually by a healthcare professional or pharmacist.

Medications and Supplements That Particularly Require Review

Cold medicines and combination pain relievers may contain duplicate pain-relieving ingredients. It is important to record not only the product name but also the active ingredients and amounts.

Why Blood Pressure and Diabetes Medications Should Not Be Reduced Excessively

If blood pressure or blood sugar becomes too low, dizziness, fainting, falls, or altered consciousness may occur. When dehydration and low blood pressure occur together, reduced blood flow to the kidneys may lead to acute kidney injury. The risk may increase when you sweat heavily in hot weather or experience vomiting or diarrhea, but medications should not be reduced automatically based only on the season.

Conversely, uncontrolled high blood pressure and diabetes have a major impact on the development and progression of chronic kidney disease. Depending on the patient’s condition, medications such as ACE inhibitors, ARBs, and SGLT2 inhibitors may protect the kidneys and cardiovascular system. Therefore, blood pressure or diabetes medications should be adjusted not because there are many of them, but based on the following evidence:

• Repeated blood pressure and blood sugar measurements
• Dizziness, fainting, or symptoms of hypoglycemia
• Test results such as eGFR and potassium
• Weight changes, swelling, and signs of dehydration
• Conditions that also require treatment, such as heart failure or proteinuria

Rather than skipping a dose based on a single low reading, it is safer to record the measurement time, posture, symptoms, and whether you had eaten, and provide that information to the prescribing institution.

An Individualized Plan Is Needed on Sick Days or During Dehydration

Vomiting, diarrhea, high fever, heavy sweating, or inadequate intake can change the risks of medications that are normally safe. Some blood pressure medications, diuretics, and diabetes medications may need to be temporarily adjusted depending on the circumstances, but it is not appropriate for every patient to stop the same medications. This is because stopping them may itself be dangerous for people with heart failure or severe high blood pressure.

During routine appointments, confirm the following in advance:

1. Which symptoms and situations should be considered a sick day
2. The exact ingredient names of medications that may be temporarily adjusted
3. The conditions for restarting medications and whether tests are needed
4. Blood pressure, blood sugar, or symptom thresholds that require immediate contact with a medical institution
5. Whether you have restrictions, such as heart failure or dialysis, that make it unsafe to drink large amounts of water on your own

This plan should be determined by healthcare professionals who know your current conditions and prescriptions, not by a general list found online.

How to Receive a Medication Review During an Appointment

A medication review is not a process of unilaterally stopping prescription medications. It is a process of reducing unnecessary risks while maintaining treatment goals.

• List prescription medications, over-the-counter medications, ointments, eye drops, herbal medicines, vitamins, and supplements together.
• Include pain relievers and cold medicines taken only as needed, as well as antibiotics you recently finished.
• Record why you take each medication, the amount you actually take, the time you take it, and the prescribing institution.
• Prepare your latest eGFR, uACR, potassium, blood pressure, and blood sugar data.
• Ask individually about duplicate ingredients, current indications, kidney-adjusted dosing, interactions, and whether each medication can be discontinued.
• After an adjustment, confirm when repeat testing is needed and the conditions under which the medication should be restarted.

If you use multiple medical institutions, do not assume that a prescriber at one automatically knows which medications were prescribed elsewhere. It is more accurate to directly show medication packets, product photos, or an up-to-date list.

Factors to Manage Alongside Medications

Kidney health cannot be managed solely by reducing medications. Blood pressure and blood sugar control, smoking cessation, appropriate physical activity, and dietary management are also necessary.

However, a chronic kidney disease diet should not be generalized. Appropriate amounts of protein, sodium, potassium, phosphorus, and fluids vary depending on the disease stage, test results, nutritional status, and whether the patient receives dialysis. Excessive restriction without testing can cause malnutrition or muscle loss. Salt substitutes containing potassium may also be dangerous for some patients and with certain medications, so their ingredients must be checked.

Exercise can also support health management when your condition is stable, but if you have chest pain, severe shortness of breath, rapidly worsening swelling, an infection, or uncontrolled blood pressure, you should seek medical care first.

Signs Requiring Immediate Medical Care

If any of the following changes occur, do not merely adjust medications on your own; promptly consult a medical institution:

• A marked decrease in urine output or almost no urine
• Persistent vomiting or diarrhea that makes it difficult to keep down fluids and medications
• Fainting, severe dizziness, or altered consciousness
• Suddenly worsening swelling or shortness of breath
• Severe weakness, palpitations, or muscle abnormalities
• Recurrent hypoglycemia or symptoms of low blood pressure that do not resolve

Emergency evaluation is necessary for urgent symptoms such as reduced consciousness, shortness of breath, or fainting.

Key Takeaway

Protecting the kidneys does not require minimizing medications indiscriminately. The key is to continue medications with clear therapeutic benefits while identifying and safely adjusting doses that are inappropriate for kidney function and duplicate or unnecessary medications. In particular, do not stop prescription medications on your own, and regularly review your complete list, including over-the-counter medications and supplements, with a healthcare professional or pharmacist.