Does cycloserine have any effect on creatinine levels?

Whether Cycloserine (Cycloserine) will affect renal function, especially creatinine levels, is a matter of great concern to patients during long-term use. The main metabolism and excretion pathway of cycloserine is indeed related to the kidneys, so changes in creatinine levels during use deserve continued attention, but it does not mean that all patients will develop significant renal function abnormalities. Understanding its mechanism, monitoring methods, and high-risk groups can help patients view this drug more scientifically.

Cycloserine is excreted by the kidneys, and its elimination outside the body mainly relies on glomerular filtration. Therefore, when the patient's renal function originally decreases, the drug clearance rate will slow down and the blood drug concentration may increase, thereby increasing the risk of adverse reactions. In this case, doctors usually adjust the dose based on creatinine levels, Ccr, or estimated GFR. In other words, cycloserine is more "affected by creatinine" than "actively affects creatinine," a concept that patients often confuse.

According to medical data, cycloserine itself is not a typical nephrotoxic drug and does not belong to the category of anti-infective drugs that commonly cause acute kidney injury (AKI). However, because it relies on renal excretion, during long-term treatment, if the patient's renal function fluctuates due to other factors, such as dehydration, simultaneous use of other drugs that may affect the kidneys (such as aminoglycosides, certain diuretics), metabolic changes caused by infection and fever, creatinine may increase. At this time, the blood concentration of cycloserine is also likely to be high, and the patient may mistakenly believe that "cycloserine causes an increase in creatinine."

Therefore, it is recommended to regularly monitor indicators such as creatinine, urea nitrogen, and glomerular filtration rate during the use of cycloserine. Especially elderly patients, patients with basic kidney disease, and those with chronic diseases need to observe changes in indicators more closely. In people with inherently healthy kidney function, the risk of significant increases in creatinine from cycloserine is low.

Reference materials:https://en.wikipedia.org/wiki/Cycloserine