"Does creatine interact with any medications" gets the same answer almost everywhere: probably not, ask your doctor. The first half of that answer is not based on anything. No drug-interaction study of creatine has been run for any class of medicine, and the documents that would normally carry a warning — the drug labels — do not mention it at all. This page sets out what is actually on record for each common drug class, and where the record is empty.
The FDA labels: 214 mentions, none about the supplement
The interactions section of a US drug label is where a manufacturer lists the products a drug should not be combined with. On 2 November 2026, openFDA held 214 labels whose drug-interactions section contains the word "creatine". We read every match. In all 214 the word belongs to another term:
| What "creatine" was part of | Mentions |
|---|---|
| creatine phosphokinase (CPK), a muscle-damage blood marker | 142 |
| creatine kinase (CK), the same marker | 74 |
| urine albumin-to-creatine ratio (a kidney-study description) | 2 |
| creatine as a supplement or interacting product | 0 |
Most of the CK mentions are on statin, fibrate, colchicine and daptomycin labels, warning that the combination of those drugs can cause muscle damage that shows up as a rise in CK. That is a different molecule from the supplement; creatine kinase has its own page.
So the absence of a warning is not a clearance. Supplements are not drugs, and nobody is required to test them against drugs.
Drug class by drug class
| Drug class | Trials that combined them | What is documented | Status |
|---|---|---|---|
| SSRIs (escitalopram / Lexapro) | 1 randomised trial, 52 women | Better depression scores on creatine; adverse events 36 vs 45 | Studied once, in one population |
| Statins | 1 uncontrolled study, 13 patients | Symptom score fell, CK did not; one stopped for raised creatinine | Not tested in a controlled trial |
| Metformin and other diabetes drugs | 1 randomised trial in type 2 diabetes (medication combination not the question) | HbA1c −1.1 points vs placebo with training; metformin disturbs one urine-creatinine assay | Interaction not tested |
| NSAIDs (ibuprofen, naproxen) | None found | Both affect kidney blood tests, by different routes | Not studied |
| Blood thinners | None found | Some are dosed on kidney estimates | Not studied |
| Diuretics, ACE inhibitors, other blood-pressure drugs | None found | What the blood-pressure trials on creatine measured | Not studied |
| Caffeine (not a prescription drug, but the most-asked combination) | Several trials | Covered on creatine and caffeine | Studied |
Antidepressants: the one deliberate combination
In 2012 a Korean–American group ran the only trial designed to give creatine on top of a prescription drug (Lyoo et al., Am J Psychiatry 2012, PMID 22864465). Fifty-two women with major depressive disorder started escitalopram and were randomised to add 5 g of creatine a day (25 women) or placebo (27) for eight weeks.
- Depression scores (Hamilton scale) improved more on creatine, from week 2 onward, through weeks 4 and 8.
- Dropouts were 8 of 25 on creatine (32%) and 5 of 27 on placebo (18.5%); the difference was not significant.
- Reported adverse events totalled 36 on creatine and 45 on placebo.
What this does not show: anything about men, other SSRIs, SNRIs or other antidepressant classes, bipolar disorder, or use beyond eight weeks. This site's creatine and anxiety page covers the mood trials more broadly.
Statins: a 13-person study run by the product's makers
The claim that creatine eases statin muscle pain rests mainly on one 2024 Italian study (J Clin Med 2024, PMID 39685653). Thirteen consecutive outpatients with statin myopathy, older adults with past heart or brain ischaemia, took 1 g of creatine three times a day. Eleven finished. A symptom score fell; creatine kinase did not. One patient stopped because serum creatinine rose.
Three limits, all stated in the paper itself: there was no control group, the population was small, and the conflict-of-interest statement records that two authors are founding members of the university spin-off that makes the creatine product used. The authors' own conclusion is that creatine "may" help milder statin myopathy. No randomised trial has tested it. Anyone with muscle symptoms on a statin is in the group whose prescriber needs to know, because the symptom can signal real muscle damage.
Diabetes medicines and metformin: an effect on the target, and on the lab test
There is no interaction study of creatine with metformin, insulin, sulfonylureas or GLP-1 drugs. Two documented facts bear on the question.
Creatine may move the number the drugs are dosed against. In a 12-week randomised trial of 25 people with type 2 diabetes doing an exercise programme, 5 g of creatine a day lowered HbA1c from 7.4% to 6.4% against no change on placebo — a difference of 1.1 percentage points (Gualano et al., Med Sci Sports Exerc 2011, PMID 20881878). One trial, with training, in 25 people; this site's creatine and medical conditions page reads it in full, and what the diabetes trials show sets it against the rest of the glucose evidence. A change of that size is the kind a prescriber adjusts medication around.
Metformin disturbs one way of measuring creatinine. A 2025 laboratory study of 328 patients' urine samples, 84 of them taking metformin, found the drug inhibits the creatinase step of the enzymatic creatinine method — the same step that acts on creatine — giving falsely low urine creatinine (Biochem Biophys Rep 2025, PMID 41019291). Urine creatinine is used to correct many urine tests, including the albumin test used to monitor diabetic kidneys.
Painkillers, blood thinners and anything dosed on kidney numbers
Here the record is empty, and the reason to ask anyway is arithmetic rather than toxicity.
Creatine is broken down to creatinine, and supplementing it raises serum creatinine in people whose kidney filtration has not changed — the effect explained on what creatine does to a blood test and creatine and kidneys. Laboratories turn serum creatinine into an estimated filtration rate (eGFR), and many drugs are dosed or stopped on that estimate: metformin, several antibiotics, some direct oral anticoagulants, lithium. A creatine-raised creatinine can make kidneys look worse than they are; a clinician who does not know about the supplement may adjust a drug for a problem that is not there. That is a documented mechanism, not a documented harm.
NSAIDs such as ibuprofen and naproxen can reduce blood flow to the kidneys, which is why their labels carry kidney warnings. Nobody has studied them with creatine. A PubMed search on 2 November 2026 for creatine with NSAIDs, ibuprofen or anti-inflammatory drugs returned 15 records and no trial of the combination. For warfarin, anticoagulants and blood thinners the same search returned 206 records; the creatine in them is creatine kinase.
What the FDA's supplement reports add
The FDA's adverse-event database for foods and supplements (CAERS) held 210 reports naming a creatine product on 2 November 2026. Its product list records foods and supplements only: of the 212 "concomitant" products in those reports, 199 are vitamins, minerals, protein or other supplements and the rest are foods, drinks and cosmetics — prescription drugs are not captured as products at all. One report, from 2012, codes its reaction as "drug interaction", with hospitalisation as the outcome and a plain creatine powder as the only product listed; which drug was involved is not in the public record. The database was not built to detect interactions, so one report neither shows a problem nor rules one out.
What is not established
- Any drug–creatine interaction, for any class. No formal interaction study exists.
- Whether creatine is safe with SSRIs beyond one 8-week trial in women.
- Whether creatine helps or harms statin muscle symptoms. One uncontrolled, conflicted study.
- How large a creatinine rise from creatine must be to change a drug decision. It depends on the drug, the dose and the person's kidneys.
Who should ask before combining
Anyone taking prescription medicine, and in particular anyone on an antidepressant or mood stabiliser, a statin, any diabetes medicine, a blood thinner, a diuretic, lithium, or any drug their doctor doses by kidney blood tests. The useful thing to tell the prescriber or pharmacist is simple and checkable: the product, the amount on the label, and the date it was started — so that the next creatinine result is read with it in mind.
Related reading: creatine side effects, is creatine bad for you?, creatine and alcohol.
Sources and dates
- openFDA drug label API,
drug_interactions:creatine, all 214 matching labels downloaded and every "creatine" token classified, 2026-11-02. open.fda.gov/apis/drug/label - Lyoo IK et al. Creatine augmentation of an SSRI in women with major depressive disorder. Am J Psychiatry 2012. PMID 22864465, abstract read 2026-11-02.
- Low-dose creatine supplementation in early-stage statin myopathy, preliminary study. J Clin Med 2024;13(23):7194. PMID 39685653, abstract and conflict-of-interest statement read 2026-11-02.
- Gualano B et al. Creatine in type 2 diabetes: a randomized, double-blind, placebo-controlled trial. Med Sci Sports Exerc 2011. PMID 20881878.
- Metformin interferes with urinary creatinine measurement using enzymatic method. Biochem Biophys Rep 2025. PMID 41019291, abstract read 2026-11-02.
- PubMed E-utilities searches run 2026-11-02: creatine + NSAID/ibuprofen/anti-inflammatory + supplement (15 records); creatine + warfarin/anticoagulant/blood thinner (206 records); creatine + statin + myopathy/myalgia + supplement (33 records).
- FDA CAERS via openFDA food/event,
products.name_brand:creatine, 210 reports, 2026-11-02.