Dozens of everyday medicines can push a creatinine result upward, and they do it by at least six different mechanisms. That distinction is the whole point of this page. Some drugs raise the number on the report while your kidneys filter exactly as well as they did last week. Others reduce filtration temporarily and reversibly. A smaller group genuinely injures kidney tissue. Same laboratory value, three completely different situations, and the drug involved usually tells you which one you are looking at.
The short answer, before the detail: the medicines most often behind a raised creatinine are trimethoprim and co-trimoxazole, anti-inflammatory painkillers such as ibuprofen and naproxen, ACE inhibitors and ARBs, proton pump inhibitors, certain antibiotics including vancomycin and the aminoglycosides, iodinated contrast dye used in CT scanning, calcineurin inhibitors after transplant, platinum chemotherapy, immune checkpoint inhibitors, and the HIV drugs cobicistat, dolutegravir and ritonavir. That list mixes harmless and serious without distinction, which is exactly why a list on its own is useless. What matters is the mechanism.
So this page is organized by how the drug does it, not alphabetically. Six mechanisms, each with its own timing, its own size of effect, and its own answer to the only question you actually care about: does this matter? Medications appear as one section within the broader article on what causes high creatinine levels; here they get the full treatment, drug by drug. If you are trying to work out what your result signifies in the first place, what high creatinine means is the better starting point.
Nothing here is a reason to stop, skip or reduce a prescribed medicine. Several of the drugs below raise creatinine precisely because they are protecting your kidneys. To see what your own number implies for filtration, use the Waldev creatinine clearance calculator, then take the result to the person who prescribed the drug.
On this page
The six mechanisms, and why the mechanism decides everything
Creatinine leaves your body in two ways. About 85 to 90 percent is filtered passively at the glomerulus, the tuft of capillaries that does the sieving. The remaining 10 to 15 percent is pumped out actively by transporter proteins in the tubule further downstream, a kind of side door. Anything that closes the side door raises blood creatinine without touching the sieve. Anything that damages the sieve raises it for real. The two are indistinguishable on a printed result and completely different in what they mean.
The side door closes. Creatinine backs up by roughly 10 to 30 percent within days, then stops rising. Filtration is unchanged. Trimethoprim, cimetidine, cobicistat, dolutegravir, ritonavir.
The drug relaxes or constricts the small vessels feeding and draining the glomerulus, so less filtering happens. Genuine, usually reverses when the drug stops or fluid is replaced. NSAIDs, ACE inhibitors, ARBs, diuretics.
The drug or its breakdown products poison the tubular cells. Dose-related, cumulative, monitored deliberately. Aminoglycosides, vancomycin, amphotericin B, cisplatin, calcineurin inhibitors, contrast dye.
An immune reaction to the drug inflames the tissue between the tubules. Not dose-related. Often starts weeks after the drug did, which is why the link gets missed. PPIs, penicillins, cephalosporins, allopurinol.
Cancer immunotherapy releases the brakes on T cells, and occasionally those T cells attack kidney tissue. Uncommon, treatable, needs early recognition. Nivolumab (Opdivo), pembrolizumab, ipilimumab.
The drug deliberately lowers pressure inside the glomerulus to protect it long-term. Creatinine steps up, then flattens, and the kidney does better over years. SGLT2 inhibitors, and in a slower way ACE inhibitors and ARBs.
Notice that mechanisms one and six produce a higher number and no harm at all. Mechanism two produces a real but recoverable drop in filtration. Only three, four and five involve tissue being damaged. When a doctor sees a raised creatinine in someone on medication, sorting it into one of these six boxes is most of the thinking, and the drug name usually does most of the sorting for them.
Drugs that block the side door and raise the number without touching filtration
This is the category that causes the most unnecessary alarm. The measured creatinine climbs, sometimes by a third, and the kidney is doing precisely what it did before the prescription was written.
The transporters involved are called OCT2 and MATE1/MATE2-K. They sit in the tubular cells and shunt creatinine from blood into urine. Several drugs bind them, either because that is a side effect or, in the HIV drugs, because blocking transporters is part of how the drug works. With the side door partly shut, creatinine accumulates in blood until a new equilibrium is reached. The rise appears within two to seven days, is usually somewhere between 10 and 30 percent, and then plateaus. That plateau is the signature. Genuine progressive kidney injury does not politely stop climbing after a week.
| Drug | Used for | Typical effect on creatinine | What it means |
|---|---|---|---|
| Trimethoprim | Urinary tract infection | Rise within 2–5 days, commonly 10–30% | No change in filtration. Returns to baseline days after the course ends. |
| Co-trimoxazole (trimethoprim + sulfamethoxazole) | Chest infection, PCP prophylaxis, some skin infections | Same as trimethoprim, sometimes larger with longer courses | Mostly the same harmless block, but high-dose prolonged courses can also cause true injury, so it gets monitored. |
| Cimetidine | Reflux, ulcers (now largely superseded) | Modest rise; effect strong enough that it was once used deliberately in research | No filtration change. Other H2 blockers such as famotidine do this far less. |
| Cobicistat | HIV therapy, as a pharmacokinetic booster | Rise of roughly 0.1–0.15 mg/dL, appearing in the first weeks | Expected, documented, plateaus. Prescribers check a baseline precisely so they can recognize it. |
| Dolutegravir | HIV therapy | Small early rise, then flat | Well described in the drug’s own labeling. Not nephrotoxicity. |
| Ritonavir | HIV therapy and as a booster in some antiviral combinations | Small rise via the same transporters | Same picture. Note ritonavir also appears in combination antivirals used for other infections. |
| Ranolazine | Angina | Small rise, early, stable | Transporter inhibition, not injury. |
| Cephalexin and some other cephalosporins | Bacterial infection | Can interfere with older Jaffe assays | Analytical interference rather than biology. Enzymatic assays are less affected. |
Here is what this looks like in real life. A 68-year-old woman gets a seven-day course of trimethoprim for a urinary infection. A routine blood test on day five shows creatinine up from 82 to 104 µmol/L. Nothing else on the panel has moved. Her urine output is normal, she has no swelling, she feels well. Two weeks after finishing the course, repeat testing shows 84. Nothing happened to her kidneys. The side door was shut for a week and then reopened. Had that day-five result triggered a scan and a nephrology referral, the outcome would have been the same, only with more anxiety and expense.
The one caveat. A transporter block is harmless in isolation, but it can also mask a real problem developing underneath it, and in a very small number of people co-trimoxazole causes genuine interstitial nephritis or hyperkalemia. A doctor who repeats the test and finds the value still climbing three weeks after the antibiotic stopped is right to look further. The plateau is what reassures; a continued rise is not the transporter effect.
Drugs that lower filtration pressure: NSAIDs, ACE inhibitors and ARBs
Filtration is not passive drainage. It depends on a pressure difference across the glomerular capillaries, and that pressure is held steady by two small vessels: the afferent arteriole bringing blood in and the efferent arteriole letting it out. Squeeze the outflow or widen the inflow and pressure rises. Do the opposite and it falls. Several extremely common drugs act on exactly those two vessels.
NSAIDs constrict the inlet
Ibuprofen, naproxen, diclofenac, indometacin, celecoxib, and the aspirin-containing combinations sold for period pain and migraine. Prostaglandins keep the afferent arteriole open when blood volume is low. NSAIDs block prostaglandin production, so in anyone dehydrated, elderly, bleeding, or already on blood-pressure drugs, the inlet narrows and filtration drops. In a well-hydrated healthy 25-year-old, the same tablet does almost nothing measurable.
ACE inhibitors and ARBs relax the outlet
Ramipril, lisinopril, enalapril, perindopril; losartan, candesartan, valsartan, irbesartan. Angiotensin II tightens the efferent arteriole. Block it and the outlet relaxes, pressure inside the glomerulus falls, and creatinine steps up by a predictable amount. This is the drug working, not failing. Long term it is the reason these drugs slow kidney disease in diabetes and protein leakage.
A rise of up to about 30 percent after starting an ACE inhibitor or ARB is generally regarded as acceptable and expected, provided potassium is normal and the value then stabilizes. Prescribers plan for it: a blood test one to two weeks after starting or increasing the dose exists precisely to catch the rise and confirm it has settled. Beyond roughly 30 percent, or if it keeps climbing, that prompts a look for something else, most often narrowing of the renal arteries or too much diuretic on board. None of that decision-making belongs to the patient, and none of it should ever involve stopping a heart or blood-pressure drug independently.
Over-the-counter anti-inflammatories deserve their own paragraph because they are the most under-reported cause on this entire page. Nobody lists ibuprofen when a nurse asks what medications they take. Yet a fortnight of regular naproxen for a bad back, taken by a 74-year-old already on ramipril and a thiazide during a heatwave, is one of the classic routes into acute kidney injury. The tablets are not dangerous in themselves. The combination and the context are.
The triple whammy, and why prescribers know it by name
There is a specific three-drug combination that turns up so often in acute kidney injury audits that it has an informal nickname in British and Australian practice: the triple whammy. It is an ACE inhibitor or ARB, plus a diuretic, plus an NSAID.
Furosemide, bendroflumethiazide, indapamide and the rest work by making you lose salt and water. Less fluid in the circulation means the kidney is already leaning on its compensating mechanisms to keep filtration going.
With angiotensin II blocked, the efferent arteriole cannot tighten to hold pressure up. One of the two pressure levers is now disabled.
Prostaglandins were keeping the afferent arteriole open to compensate. The NSAID blocks them. The second lever is now disabled too, and filtration falls sharply.
A stomach bug, a hot week, a day of poor drinking, a fever. Each component alone is usually tolerated. All three together with a volume insult on top is how a stable 78-year-old becomes an admission.
The reason to know this is not to refuse any of the three. Diuretics and ACE inhibitors are among the most valuable drugs in medicine, and millions take them safely for decades. The reason to know it is so that you can ask the right question before you buy ibuprofen for a headache, and so that you take seriously the advice, given at every diabetes and heart failure clinic, to pause certain tablets during vomiting and diarrhea. That advice is called sick day guidance, it comes from your own prescriber, and it is the one situation where a temporary pause is planned in advance rather than improvised. Dehydration on its own raises creatinine; dehydration on top of this combination does something considerably more abrupt.
Two other pairings worth naming. Lithium plus an NSAID or an ACE inhibitor pushes lithium levels up while filtration falls, which is doubly hazardous. And a diuretic plus an SGLT2 inhibitor plus an intercurrent illness has become a modern equivalent as those drugs have spread, though the mechanism there is volume depletion rather than pressure loss.
Drugs that are directly toxic to kidney tissue
This is the category where the creatinine rise reflects cells being damaged. These drugs are still used, widely and correctly, because the conditions they treat are worse than the risk. What changes is that the monitoring is deliberate and built into the treatment plan from the start.
| Drug or class | Examples | How it injures | Typical timing |
|---|---|---|---|
| Aminoglycoside antibiotics | Gentamicin, amikacin, tobramycin | Accumulates inside proximal tubular cells and damages them; also affects hearing and balance | Usually after 5–7 days of treatment, sometimes after the course has finished |
| Glycopeptide antibiotics | Vancomycin | Tubular oxidative injury and cast formation; risk rises with high trough levels and with concurrent piperacillin-tazobactam | Days to a couple of weeks |
| Antifungals | Amphotericin B (conventional form especially) | Constricts vessels and damages tubules; causes potassium and magnesium wasting | Early and dose-cumulative |
| Platinum chemotherapy | Cisplatin, and to a much lesser degree carboplatin | Concentrated in tubular cells where it triggers cell death; magnesium loss is characteristic | Days after infusion, cumulative across cycles |
| Calcineurin inhibitors | Ciclosporin, tacrolimus | Constricts the afferent arteriole acutely; causes scarring with long exposure | Both immediate and over years |
| Iodinated contrast | CT contrast dye, angiography | Vasoconstriction plus direct tubular toxicity in susceptible people | Peaks 48–72 hours after the scan, usually recovers within a week |
| Antivirals | Tenofovir disoproxil, cidofovir, high-dose aciclovir | Tubular dysfunction; aciclovir can also crystallise in the tubules if given fast or to a dehydrated person | Aciclovir within 24–48 hours; tenofovir over months |
| Osmotic and crystal-forming agents | High-dose intravenous immunoglobulin, methotrexate at high dose | Tubular obstruction by crystals or osmotic injury | Within days of the dose |
| Bisphosphonates (intravenous) | Zoledronic acid, pamidronate | Tubular injury or collapsing glomerulopathy, uncommon | Days to weeks after infusion |
| Lithium | Lithium carbonate | Concentrating defect early; interstitial scarring after many years | Years, though acute toxicity can occur any time |
Contrast deserves comment because it worries people out of proportion to the modern evidence. The risk of contrast-associated kidney injury in someone with normal baseline function receiving a standard CT is now considered low, and lower than the older literature suggested, partly because the older studies could not separate the dye from the illness that prompted the scan. The risk is real in people with existing significant kidney disease, diabetes, heart failure or dehydration, and in those situations radiology departments adjust the dose, hydrate beforehand, and check creatinine afterward. Refusing a scan you clinically need in order to avoid a temporary creatinine bump is usually the worse trade.
The aminoglycosides are the archetype of monitored toxicity. Levels are measured, courses are kept short, dosing intervals are adjusted to kidney function, and creatinine is checked every day or two. That is also why creatinine clearance is used for drug dosing rather than eGFR for several of these agents, and why an inaccurate creatinine matters clinically rather than just cosmetically.
Interstitial nephritis: an immune reaction that starts weeks late
Acute interstitial nephritis is an allergic reaction to a drug, expressed in the kidney. Immune cells infiltrate the tissue between the tubules, the tissue swells, and filtration falls. It is not dose-related in the way toxicity is, which means a small dose can cause it and a large one may not. Its defining and most troublesome feature is the delay.
The classic teaching triad is fever, rash and eosinophilia in the blood. In practice fewer than one in ten people have all three, and many have none of them. What they have instead is a creatinine that has drifted up for no obvious reason, sometimes with a little blood or protein in the urine and white cells in the urine without an infection. The drug was started three weeks ago, or three months ago, and nobody connects the two because the timing feels wrong.
Proton pump inhibitors. Omeprazole, lansoprazole, pantoprazole, esomeprazole. Individually rare, but so many people take them, often for years and often without an ongoing indication, that PPIs are now among the most frequently identified drug causes in biopsy series. Onset commonly weeks to months in.
Penicillins. Flucloxacillin has a particular reputation, and amoxicillin and co-amoxiclav also feature. Historically methicillin was the drug that first defined the condition.
Cephalosporins. Cefalexin, ceftriaxone and others, by the same immune route.
Allopurinol. Used for gout, and capable of causing both interstitial nephritis and a severe systemic hypersensitivity syndrome. Kidney impairment and a rash appearing together after starting it always deserves urgent review.
NSAIDs, again. Anti-inflammatories cause kidney trouble by two entirely separate mechanisms. The pressure effect is immediate; the interstitial nephritis is delayed and immune, and sometimes comes with heavy protein leakage.
Ciprofloxacin and other quinolones, rifampicin, sulfonamides, mesalazine, phenytoin, some diuretics. A long tail of less common culprits. Rifampicin is notable for causing it on intermittent rather than continuous dosing.
Why this matters more than the frequency suggests: interstitial nephritis usually recovers if the drug is identified and withdrawn early, and often does not recover fully if it runs for months. The kidney replaces inflamed tissue with scar. That is the argument for reviewing whether a proton pump inhibitor started four years ago for indigestion is still needed, a review that belongs to your GP or pharmacist and takes about five minutes of their time.
Diagnosis is not straightforward. Urine testing helps, blood eosinophils sometimes help, and a kidney biopsy is the only definitive answer. In practice many cases are diagnosed by stopping the suspected drug under supervision and watching the creatinine fall over the following weeks. Some people are given a course of steroids. All of that is specialist territory.
Immune checkpoint inhibitors: does Opdivo raise creatinine?
Yes, it can, and the question is asked often enough to deserve a direct answer. Nivolumab, sold as Opdivo, along with pembrolizumab (Keytruda), atezolizumab, durvalumab and ipilimumab, works by taking the brakes off your own T cells so they attack cancer. The brakes are not cancer-specific. Removing them occasionally lets the immune system attack normal tissue too, and the kidney is one of the organs it can turn on.
The usual pattern is immune-related acute interstitial nephritis, the same tissue reaction described above, driven by activated T cells rather than a drug allergy. Reported rates of any creatinine rise on checkpoint therapy sit broadly in the low single figures to around ten percent depending on the drug, the combination and how the studies defined it, with clinically significant kidney injury less common than that. Combination therapy, particularly nivolumab with ipilimumab, carries more risk than a single agent. Onset is typically weeks to several months into treatment, later than most drug reactions, and it can appear after the last dose.
Being on a proton pump inhibitor or an NSAID at the same time, having lower kidney function to start with, and receiving combination checkpoint therapy. The PPI association is consistent enough across studies that many oncology teams now review acid suppression before starting immunotherapy.
A rising creatinine on routine pre-cycle bloods, usually without symptoms. Sometimes reduced urine output, swelling, or another immune side effect elsewhere at the same time such as thyroid, skin, gut or liver involvement.
Other causes are excluded first, since people on chemotherapy are also dehydrated, on antibiotics, and having contrast scans. If it is immune, treatment is usually corticosteroids and a pause in the immunotherapy. Most people recover kidney function, and many can restart the drug.
The practical point for anyone on immunotherapy: your creatinine is already being checked before every cycle, which is exactly why this gets caught. Report new swelling, a marked drop in how much you are passing, unexplained nausea or unusual tiredness to your oncology team rather than waiting for the next appointment. And never assume a rise means the treatment must stop for good, because in a large share of cases it does not.
SGLT2 inhibitors: the rise that means the drug is working
Dapagliflozin, empagliflozin, canagliflozin and ertugliflozin cause a small early rise in creatinine in most people who take them. Misreading that rise as kidney damage, and stopping the drug because of it, is one of the more consequential mistakes in current practice.
These drugs make the kidney excrete glucose in the urine, and they change sodium delivery to a sensing structure called the macula densa. That triggers a normal reflex which constricts the afferent arteriole and lowers pressure inside the glomerulus. Filtration drops a little, creatinine steps up, and then it stops. The medical shorthand is the initial dip in eGFR. It typically appears within the first few weeks, is modest, and reverses if the drug is stopped.
What happens afterward is the point. Over the following years, people on these drugs lose kidney function more slowly than those who are not, and the large outcome trials in chronic kidney disease and heart failure showed fewer people progressing to dialysis and fewer cardiovascular deaths. The early dip is the visible sign of the mechanism that produces that benefit: high pressure inside the glomerulus is what wears it out, and these drugs take the pressure down. A patient who sees their creatinine go from 110 to 125 and quietly stops the tablet has traded a number for an outcome.
How to tell it apart from trouble. The expected dip is early, small and self-limiting. It does not keep going. A creatinine that continues to climb month after month on an SGLT2 inhibitor is not the expected effect and should be looked at, and so should any rise accompanied by volume depletion from illness or too much diuretic, since these drugs do mildly dehydrate. As with everything on this page, that assessment belongs to your prescriber. Creatinine fluctuates for many reasons, and a single reading rarely decides anything.
ACE inhibitors and ARBs sit in the same conceptual box for the same reason, which is why they appear twice on this page. The rise they cause is not a side effect to be tolerated so much as the visible edge of the protection they give. Understanding that changes how you read your own results, and it is worth reading alongside what medicines actually reduce creatinine, which covers the flip side of the same question.
Statins and rosuvastatin: an honest answer
Does rosuvastatin increase creatinine? Not by any direct action on the kidney in the vast majority of people who take it. The honest answer has two parts, and the second part is where the real concern sits.
Statins do not block tubular secretion, do not reduce filtration pressure, and are not tubular toxins. Large trials of rosuvastatin, atorvastatin and simvastatin have not shown meaningful loss of kidney function attributable to the drug, and statins are used routinely and safely in people with chronic kidney disease. Two footnotes exist. High-dose rosuvastatin can cause a small amount of protein to appear in the urine, arising from the tubule rather than the glomerulus, which is generally transient and not associated with progressive damage. And people already on statins were sometimes noted in early studies to have slightly different creatinine trajectories, an observation that has not held up as a signal of harm.
The real mechanism, when a statin does raise creatinine, is muscle. Statins can cause muscle inflammation, and very rarely rhabdomyolysis, where muscle breaks down rapidly and floods the blood with its contents. Because creatinine comes from muscle in the first place, that alone lifts the reading. Worse, the myoglobin released at the same time is directly toxic to tubules, so filtration genuinely falls. This is the route by which a statin can cause serious kidney injury, and it is rare: severe rhabdomyolysis is reported in the region of one to three cases per hundred thousand person-years of statin treatment, and higher with certain drug interactions.
What raises the muscle risk. High doses, older age, low body weight, hypothyroidism, kidney impairment already present, heavy alcohol use, and drug interactions. Combining a statin with a fibrate, particularly gemfibrozil, or with certain antifungals, macrolide antibiotics such as clarithromycin, ciclosporin or some HIV drugs, pushes statin levels up and with them the muscle risk.
What to watch for. Severe, widespread muscle pain and weakness rather than the mild aches many people get, especially with dark brown or cola-colored urine and reduced urine output. That combination needs same-day medical assessment, not a wait-and-see approach.
What test tells you. Creatine kinase, a different substance entirely from creatinine despite the similar name. A markedly raised CK confirms muscle breakdown. Raised creatine kinase and raised creatinine are frequently confused by patients and occasionally by search engines.
So: if you take rosuvastatin and your creatinine has risen, the statin is a possible but not a likely explanation, and the way to test it is to look for muscle symptoms and check CK rather than to assume. Millions of people take statins with entirely stable kidney function for decades. The same confusion between creatine, creatinine and creatine kinase runs through the question of whether creatine supplements raise creatinine, which is a genuinely different mechanism again.
Does biotin affect creatinine results? What the interference actually hits
Biotin, vitamin B7, taken in the high doses sold for hair, skin and nail supplements, is a well-documented cause of laboratory interference. It is also badly misunderstood, because the interference is specific to a particular type of test and creatinine is usually not one of them.
The problem is with immunoassays built on the biotin-streptavidin binding system. Excess biotin in the blood saturates that system and skews the result, either upward or downward depending on how the assay is designed. Thyroid function tests, troponin, some hormone assays, vitamin D and parathyroid hormone are the ones repeatedly implicated. The regulatory warnings about biotin interference, including a well-publicised safety communication from the US Food and Drug Administration, were driven by falsely reassuring troponin results in people who were actually having a heart attack.
Creatinine is not usually measured that way. Most laboratories measure it either by the Jaffe reaction, a color-change chemistry using picric acid, or by an enzymatic method. Neither depends on biotin-streptavidin. So in ordinary circumstances a biotin supplement does not meaningfully change your creatinine result.
Where the nuance sits. A small number of enzymatic creatinine methods on particular analyzer platforms have been reported to show minor biotin susceptibility, and cystatin C, the alternative filtration marker, is measured immunologically and is more plausibly affected on some platforms. The practical advice remains simple and is worth following regardless: tell the phlebotomist or your doctor if you take high-dose biotin, and if a supplement is only cosmetic, pausing it for two to three days before blood tests removes the question entirely from every assay in the panel. Do not pause biotin prescribed for a medical reason without asking.
If your creatinine is genuinely raised and you take biotin, do not let the supplement become the explanation of convenience. The far more likely culprits are somewhere in the six mechanisms above, or not a drug at all. What creatinine is and what counts as a normal level give the background for interpreting your own figure.
Full reference table: drugs by mechanism, timing and meaning
One place to look things up. Find the drug, read across, and note that the last column is the one that matters most.
| Drug or class | Mechanism | Onset | Reversible? | Real change in filtration? |
|---|---|---|---|---|
| Trimethoprim, co-trimoxazole | Blocks tubular secretion | 2–5 days | Yes, days after stopping | No |
| Cimetidine | Blocks tubular secretion | Days | Yes | No |
| Cobicistat, dolutegravir, ritonavir | Blocks tubular secretion | Weeks, then plateau | Yes | No |
| Ibuprofen, naproxen, diclofenac, celecoxib | Constricts afferent arteriole; separately can cause interstitial nephritis | Days for the pressure effect; weeks for the immune one | Usually yes if caught early | Yes |
| Ramipril, lisinopril, perindopril, enalapril | Relaxes efferent arteriole | 1–2 weeks, then stable | Yes | Yes, and deliberately so |
| Losartan, candesartan, valsartan, irbesartan | Relaxes efferent arteriole | 1–2 weeks, then stable | Yes | Yes, and deliberately so |
| Furosemide, thiazides, indapamide | Volume depletion | Days to weeks | Yes with fluid and dose review | Yes |
| Dapagliflozin, empagliflozin, canagliflozin | Lowers glomerular pressure via tubuloglomerular feedback | 2–4 weeks, then flat | Yes | Yes, small, and protective long term |
| Gentamicin, amikacin, tobramycin | Direct tubular toxicity | 5–10 days | Often, but not always fully | Yes |
| Vancomycin | Direct tubular toxicity; worse with piperacillin-tazobactam | Days to weeks | Usually | Yes |
| Amphotericin B | Vasoconstriction and tubular toxicity | Early, dose-cumulative | Partially | Yes |
| Cisplatin | Direct tubular toxicity | Days after infusion | Often incomplete | Yes |
| Ciclosporin, tacrolimus | Vasoconstriction acutely; fibrosis chronically | Immediate and long-term | Acute part yes, chronic part no | Yes |
| Iodinated contrast | Vasoconstriction plus tubular toxicity | Peaks 48–72 hours | Usually within a week | Yes |
| Tenofovir disoproxil | Proximal tubular dysfunction | Months | Often partial | Yes |
| Aciclovir (intravenous, high dose) | Crystal deposition in tubules | 24–48 hours | Usually | Yes |
| Omeprazole, lansoprazole, pantoprazole, esomeprazole | Allergic interstitial nephritis | Weeks to months | Yes if caught early | Yes |
| Flucloxacillin, amoxicillin, cephalosporins | Allergic interstitial nephritis | 1–3 weeks | Usually | Yes |
| Allopurinol | Allergic interstitial nephritis and hypersensitivity syndrome | Weeks | Usually if stopped early | Yes |
| Nivolumab, pembrolizumab, ipilimumab | Immune-mediated interstitial nephritis | Weeks to months | Usually with treatment | Yes |
| Lithium | Concentrating defect, then chronic interstitial change | Years | Partially | Yes |
| Rosuvastatin and other statins | Indirect, via rare rhabdomyolysis | Any time, usually early or after an interaction | Depends on severity | Only if muscle breakdown occurs |
| Biotin (high-dose supplement) | Immunoassay interference; creatinine assays largely unaffected | While taking it | Yes, within days of stopping | No |
| Metformin | None. Does not damage kidneys; dose is adjusted because the kidney clears it | — | — | No |
Metformin is on that table deliberately, with a blank row, because it is the drug most often wrongly blamed. Metformin does not cause kidney damage. It is cleared by the kidney, so when filtration falls the dose is reduced or the drug stopped to avoid it accumulating. Cause and effect run the other way round from how people usually assume.
Telling a harmless drug effect from real kidney damage
Neither you nor your doctor can tell these apart from a single creatinine value. What separates them is pattern, and pattern needs at least two readings and some context. Five features do most of the work.
Timing relative to the drug
A rise appearing within two to seven days of starting trimethoprim or cimetidine is almost certainly the transporter block. A rise appearing three weeks into a proton pump inhibitor course, or four months into immunotherapy, fits an immune reaction. A rise appearing forty-eight hours after a contrast CT fits the dye.
Whether it plateaus
Transporter blocks and the SGLT2 dip step up and then flatten. Toxicity and nephritis keep climbing until the drug is removed. A repeat test a week or two later separates them more reliably than any single measurement.
What else moved on the panel
An isolated creatinine change with normal urea, potassium, phosphate and bicarbonate points toward interference. Real injury usually drags others with it: potassium up, bicarbonate down, urea up disproportionately in volume depletion. The urea to creatinine ratio is particularly informative here.
What the urine shows
A dipstick and a urine microscopy cost almost nothing and tell you a great deal. Blood and protein with white cells and no bacteria suggests interstitial nephritis. Granular casts suggest tubular injury. A clean urine alongside a raised creatinine leans toward a pressure or transporter cause.
How you feel
Transporter effects and the SGLT2 dip cause no symptoms at all. Genuine injury may bring reduced urine output, ankle or facial swelling, breathlessness, nausea, itching or confusion. Symptoms shift the probability sharply, and their absence is reassuring but not conclusive.
Whether the whole picture fits
An 81-year-old on five medicines who developed diarrhea, kept taking ramipril and furosemide, and bought ibuprofen for a sore hip has a very different explanation from a 40-year-old with a five-day rise on trimethoprim. Context beats the number nearly every time.
Doctors also have a simple practical test available in many cases: measure cystatin C instead. It is a different filtration marker, not secreted by those tubular transporters and not affected by muscle mass. If creatinine says filtration has fallen and cystatin C says it has not, the creatinine is being interfered with. That comparison is used routinely in HIV clinics for exactly this reason, and it is one of the differences explored in creatinine clearance versus GFR.
What to do if you think a medicine is behind your result
There is a sequence here, and the first step is not the one most people take.
Prescriptions, yes. But also the ibuprofen in your bag, the co-codamol, the omeprazole you have taken since 2019, the herbal remedies, the protein and creatine powders, the high-dose vitamins, the hair supplement with biotin, and anything bought online. The most common reason a drug cause is missed is that nobody knew about the drug. Note the start date next to each one.
Anything started in the fortnight before the test is a candidate for the fast mechanisms. Anything started in the previous three months is a candidate for interstitial nephritis. Anything that has been unchanged for five years is a much weaker candidate, unless something else changed alongside it.
Vomiting, diarrhea, a fever, a heatwave, a marathon, a new diet, a recent CT scan with dye, a hospital admission. These make an ordinary drug behave differently and are often the real trigger.
A community pharmacist can do a medication review, often without an appointment, and is well placed to spot the interactions. Ask specifically: could any of these explain this result, and does anything need checking or changing? That is a conversation, and it is theirs to have with you.
One reading is a snapshot. Ask when it should be repeated, what would count as reassuring, and what would prompt further investigation. If the suspicion is a transporter block or an expected ACE inhibitor step, the repeat should show a plateau or a return to baseline.
If you want to understand what your own number implies before that appointment, the creatinine clearance calculator converts creatinine into an estimated clearance using age, sex and weight, which is more informative than the raw value on its own. Background on the measurement is in what creatinine clearance is, and the plain-English explanation of the test itself is well covered by MedlinePlus.
Seek urgent medical attention rather than waiting for a review if you have a marked drop in how much urine you pass, new swelling of the legs or face, breathlessness, persistent vomiting, or confusion. When to worry about creatinine levels sets out the thresholds and warning signs in detail.
What never to do, however convincing the internet is
This section exists because the search results for this topic are full of advice that will hurt people.
Never stop a prescribed medicine on your own. Not the ramipril, not the immunotherapy, not the tacrolimus after a transplant, not the SGLT2 inhibitor. Several of the drugs on this page raise creatinine while actively protecting your kidneys and your heart. Stopping an ACE inhibitor because a number went up by 15 percent can cost far more than it saves, and abruptly stopping immunosuppression after a transplant risks rejection.
Never adjust a dose yourself. Halving tablets, skipping days, or spacing doses out changes drug levels in ways that are not intuitive, and for narrow-margin drugs such as lithium, tacrolimus and digoxin it is genuinely dangerous.
Do not assume the newest drug is the culprit. Interstitial nephritis is famous for starting months after the drug did. The proton pump inhibitor you have taken without a thought since before the pandemic is a more plausible cause than the antibiotic you started yesterday.
Do not treat herbal and over-the-counter products as automatically safe. Some traditional remedies have contained aristolochic acid, a documented cause of irreversible kidney damage. High-dose vitamin C can promote oxalate stones. Sports supplements are inconsistently labeled. Tell your clinician about all of it without embarrassment.
Do not chase the number with fluid loading. Drinking sensibly is good. Forcing liters of water because a website said it flushes creatinine can cause dangerous sodium dilution, especially in older people and those on diuretics or with heart failure. Lowering creatinine sensibly is a slower and duller process than the internet suggests.
Do not decline a scan or a treatment you need out of fear of a temporary rise. A short-lived creatinine bump after contrast, or during a course of the right antibiotic for a serious infection, is a price clinicians accept knowingly. The alternative is often much worse.
Chronic kidney disease itself is diagnosed and staged on more than one measurement over time, not a single flagged value, and the process is described plainly by NIDDK. If you want the wider question of whether the substance itself is doing anything to you, does creatinine damage kidneys answers it directly: it is a marker, not the disease.
Frequently asked questions
Which medication most commonly causes a high creatinine reading?
In general practice, trimethoprim and anti-inflammatory painkillers between them account for a large share of drug-related rises. Trimethoprim raises the measured value by blocking creatinine’s secretion route, so nothing has actually happened to filtration. NSAIDs such as ibuprofen and naproxen reduce filtration for real, particularly in older people, anyone dehydrated, and anyone already taking an ACE inhibitor and a diuretic. In hospital, contrast dye, vancomycin and the aminoglycoside antibiotics feature far more prominently. The commonest culprit therefore depends entirely on the setting you are asking about.
Does rosuvastatin increase creatinine levels?
Not directly in the overwhelming majority of people. Rosuvastatin does not block creatinine secretion, does not lower filtration pressure and is not toxic to tubular cells, and large trials have not shown it causing loss of kidney function. The genuine concern is muscle. Statins can rarely cause rhabdomyolysis, in which muscle breaks down and releases both creatinine and myoglobin, and myoglobin injures the kidney. That is rare, roughly a few cases per hundred thousand treatment years, and more likely with high doses or interacting drugs such as gemfibrozil or clarithromycin.
Can Opdivo raise creatinine levels?
Yes. Nivolumab, sold as Opdivo, can cause immune-mediated interstitial nephritis, in which activated T cells inflame the tissue between the kidney tubules. Reported rates of any creatinine rise sit in the low single figures to around ten percent depending on the study and whether it is combined with ipilimumab, with clinically significant injury less common. It usually appears weeks to months into treatment, often without symptoms, which is why creatinine is checked before every cycle. Treatment is generally corticosteroids and a pause, and most people recover function.
Does biotin affect creatinine test results?
Usually not. High-dose biotin interferes with immunoassays that rely on biotin-streptavidin binding, which is why thyroid tests, troponin, vitamin D and several hormone assays can be thrown off badly enough to have prompted formal regulatory warnings. Creatinine is normally measured either by the Jaffe color reaction or by an enzymatic method, neither of which uses that binding system, so the effect on creatinine is limited. Cystatin C is more plausibly affected. Even so, mention high-dose biotin before any blood test, and if it is purely cosmetic, pausing it a few days beforehand removes all doubt.
How quickly does creatinine return to normal after stopping the drug?
It depends on the mechanism. A transporter block from trimethoprim or cimetidine clears within a few days of the last dose, because nothing needed to heal. A hemodynamic effect from an NSAID or a diuretic usually resolves within days to a couple of weeks once fluid balance is restored. Contrast-related rises typically peak at two to three days and settle within a week. Interstitial nephritis and direct tubular toxicity take weeks to months and may not return fully to baseline, which is the argument for identifying them early.
Should I stop my blood pressure tablets if my creatinine went up?
No, not on your own account, and this is the single most important sentence on the page. A rise of up to roughly 30 percent after starting or increasing an ACE inhibitor or ARB is expected and generally acceptable, because the drug deliberately lowers pressure inside the glomerulus, and that is exactly the mechanism by which it protects the kidney over years. Your prescriber schedules a blood test after starting for this reason. If the rise is larger than expected or keeps climbing, they will investigate. That decision belongs with them.
Can over-the-counter painkillers really damage the kidneys?
Anti-inflammatories can, in the right circumstances. Ibuprofen, naproxen and diclofenac block the prostaglandins that keep the kidney’s inflow vessel open when blood volume is low, so in dehydration, older age, or alongside an ACE inhibitor and a diuretic, filtration falls. They can also trigger interstitial nephritis weeks later by an immune route. Acetaminophen at normal doses is different and is generally the safer choice for people with kidney concerns. Occasional ibuprofen in a healthy, well-hydrated adult is not the problem; regular use in the wrong context is.
Why does an antibiotic raise creatinine without harming the kidney?
Because roughly 10 to 15 percent of creatinine leaves the body not by filtration but through transporter proteins that pump it from blood into urine further down the tubule. Trimethoprim and cimetidine bind those transporters, closing what amounts to a side door. Creatinine backs up in the blood until a new balance is reached, so the measured value rises by perhaps 10 to 30 percent within days and then stops. The glomerulus is filtering exactly as before. The plateau is the giveaway: real injury does not stop climbing after a week.
Do proton pump inhibitors like omeprazole affect creatinine?
They can, through acute interstitial nephritis, an allergic reaction in the kidney rather than a dose-related toxicity. For any individual person it is uncommon, but so many people take these drugs long term that PPIs now appear frequently in biopsy series of drug-induced nephritis. The awkward feature is the delay: it commonly starts weeks or months after the drug did, so the connection gets missed. Recovery is usual if the drug is stopped early and incomplete if it is not. That is a good reason to review whether a long-standing PPI is still needed.
Is a small creatinine rise on a new medication always a problem?
No, and treating every rise as a problem causes its own harm. Several drugs raise creatinine as an expected consequence of doing their job, including ACE inhibitors, ARBs and SGLT2 inhibitors, and others raise the measured value without changing filtration at all. What distinguishes a benign rise is that it is small, appears early, plateaus rather than continuing, is not accompanied by changes in potassium or bicarbonate, and causes no symptoms. What distinguishes a worrying one is the opposite of all five. Your prescriber interprets that pattern, not the single figure.
The short version
Medicines raise creatinine by six distinct routes, and the route decides whether anything is wrong. Trimethoprim, cimetidine, cobicistat, dolutegravir and ritonavir close the transporter side door and lift the number without touching filtration. NSAIDs, ACE inhibitors, ARBs and diuretics change filtration pressure, which is real but usually reversible, and the three-drug combination with an NSAID on top is a well-known route into acute kidney injury. Aminoglycosides, vancomycin, amphotericin, cisplatin, calcineurin inhibitors and contrast dye are directly toxic. Proton pump inhibitors, penicillins, cephalosporins and allopurinol cause a delayed immune nephritis. Checkpoint inhibitors including Opdivo do something similar through activated T cells.
Two answers people specifically look for: rosuvastatin does not raise creatinine directly, and the concern is rare rhabdomyolysis rather than a kidney effect; and biotin interferes with immunoassays such as thyroid and troponin, but creatinine is measured enzymatically or by Jaffe, so the effect there is limited. SGLT2 inhibitors cause an early rise that signals protection, not harm. Take your medication list, including everything bought over the counter, to your prescriber. Estimate your filtration with the CrCl calculator, read further in the creatinine blog category and the wider health blog, browse the health calculators, and see the full tool library at waldev.com.
Medical disclaimer: This article is general educational information about medications and a laboratory test. It is not medical advice, it cannot tell you whether a particular drug is responsible for your own result, and it must never be used to start, stop, pause or change the dose of any medicine. Several drugs described here raise creatinine while protecting your kidneys or your life. Reference ranges differ between laboratories and results must be read alongside your history, other tests and symptoms. Always discuss your results and your medication list with a doctor, pharmacist or the team who prescribed the drug, and seek urgent medical attention if you develop much reduced urine output, new swelling, breathlessness, persistent vomiting or confusion.
MedlinePlus explains what a creatinine test measures, why it is ordered, and what affects the result. Creatinine test explained →
NIDDK on the blood and urine tests used to assess kidney function and why repeat testing matters. CKD tests & diagnosis →
The National Kidney Foundation on eGFR, what the ranges mean, and how kidney disease stages are defined. Estimated GFR explained →
