Phosphate Salts + Metformin
Metformin brand names: Glucophage, Metformin.
We found no known interaction between Phosphate Salts and Metformin in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.
Phosphate Salts and Metformin
We checked these two against our interaction database. Here is what we found.
No Known Interaction Found
We did not find a documented interaction between Metformin and Phosphate Salts in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.
If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.
Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.
Phosphate Salts safety at a glance
Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Why No Interaction Is Listed for Metformin
Interactions in our licensed database are recorded against drug classes, not just single drug names. Metformin is filed under 5 classifications — including organic cation transporter 2 (oct2) substrates, antidiabetes drugs, oral drugs. Phosphate Salts has documented interactions with 3 drug classes — the most serious being erdafitinib (balversa) (major), futibatinib (lytgobi) (major) and bisphosphonates (moderate) — and none of Metformin’s classifications are among them.
Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.
Phosphate Salts Does Interact With Other Medications
Phosphate Salts has 2 major, 10 moderate known drug interactions in our database — Metformin isn’t one of them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Phosphate Salts
We haven’t checked that one against Phosphate Salts yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Phosphate Salts. Pick one to open its full report.
Phosphate Salts in Pregnancy & Breastfeeding
When used orally and appropriately at the recommended dietary allowance (RDA) of 1250 mg daily for individuals 14-18 years of age and 700 mg daily for those over 18 years of age. ...when sodium phosphate is used rectally and appropriately short-term. ...when used intravenously. Intravenous potassium phosphate is an FDA-approved prescription drug.
When phosphate (expressed as phosphorus) intake exceeds the tolerable upper intake level (UL). Hyperphosphatemia, resulting in electrolyte disturbances, alterations in calcium homeostasis, and calcification of nonskeletal tissues, may occur. The UL during pregnancy is 3.5 grams daily. During lactation, the UL is 4 grams daily.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center
Questions About Phosphate Salts or Metformin
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Phosphate Salts or Metformin, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:
- I Accidentally Chewed My Metformin. Is That Okay? ›
- Accidentally Took An Extra Dose Of Metformin ›
- Does Cinnamon Interact With Metformin? ›
Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.
See Every Supplement That Interacts With Metformin
This page covers Phosphate Salts only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Metformin page lists 258 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Siberian Cocklebur (major), Acai (moderate), African Wild Potato (moderate) and Agaricus Mushroom (moderate).
By severity: 2 major · 217 moderate · 39 minor.
From our pharmacist’s overview on the Metformin page
“Siberian cocklebur is the ingredient I most want anyone taking metformin (Glucophage) to know about. It has caused severe low blood sugar in people, documented in humans, and it should not be combined with any glucose-lowering medication.”
Reviewed by 2 · Jul 18, 2026
Taking Phosphate Salts as Part of a Dietary Supplement Product? Check It for Interactions
We hold 6 real supplement products containing Phosphate Salts, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Phosphate Salts. Even though Phosphate Salts itself has no known interaction with Metformin, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Phosphate Salts and Metformin Sit Against Everything Else
Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.
#1,142 of 1,452 supplements looked up here in the last 7 days
#29 of 2,830 medications looked up here in the last 7 days
Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.
Where does our data come from?
- Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
- Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Phosphate Salts reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Phosphate Salts and Metformin records this page draws on were last updated July 10, 2026.
- What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
About Phosphate Salts
What is Phosphate Salts?
- Low blood phosphate levels (hypophosphatemia)
- Bowel preparation/laxative use
- Athletic performance ('phosphate loading')
- Preventing certain kidney stones
- Calcium supplementation balance
Phosphate salts are mineral compounds used mainly to correct low phosphate levels, as laxatives, and sometimes by athletes. Most people who eat a normal diet already get plenty of phosphate and do not need a supplement. Because too much phosphate can be dangerous—especially for people with kidney disease—use these products only under the guidance of a doctor or pharmacist.
Mineral salts (not a plant) · Tablets, capsules, powders, oral solutions, effervescent tablets, and intravenous (medical) solutions
An interaction check asks whether these two react with each other — it does not ask whether Phosphate Salts is a good idea for someone in your situation. Here is what our Phosphate Salts record says about it on its own.
Phosphate Salts: dosing
There is no single standard supplement dose that fits everyone, because the right amount depends on why it is being used—correcting a deficiency, bowel prep, or another reason—and on your kidney function and blood levels.Phosphate products used in hospitals or for bowel prep are dosed by a healthcare provider. For over-the-counter products, follow the label exactly and do not take more than directed.
From our Phosphate Salts monograph — the full record covers uses, side effects and every documented interaction.
About Metformin
What Is Metformin Used For?
Brand names: Glucophage, Metformin
Metformin is used to improve blood sugar (glucose) control in people with type 2 diabetes mellitus. It is always used together with diet and exercise, not instead of them.
Metformin hydrochloride tablets and oral solution are approved for adults and children 10 years and older. Metformin hydrochloride extended-release tablets — including brands such as Fortamet, Glumetza, and Metformin Hydrochloride Extended Release — are approved for adults only.
Other Drugs & Phosphate Salts
Browse every other medication we’ve checked against Phosphate Salts — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
2 interactions
10 interactions
No interaction 2,817 drugs checked — show the list
We also checked Phosphate Salts against these medications and found no known interaction in our sources. Open any page to confirm.
- Apixaban ›
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Warfarin ›
- Sertraline ›
- Testosterone ›
- Losartan Potassium ›
- Metoprolol ›
- Aspirin ›
- Ivermectin ›
- Rivaroxaban ›
- Rosuvastatin ›
- Escitalopram ›
- Tadalafil ›
- Acetaminophen ›
- Clopidogrel ›
- Valacyclovir ›
- Atorvastatin ›
- Docusate ›
- Hydroxyurea ›
- Abemaciclib ›
- Methamphetamine ›
- Sumatriptan ›
- Ibuprofen ›
- Semaglutide ›
- Tirzepatide ›
- Warfarin Sodium ›
- Prednisone ›
- Propranolol ›
- Lisdexamfetamine ›
- Acyclovir ›
- Bupropion ›
- Amoxicillin ›
- Lisinopril ›
- Bendamustine ›
- Amitriptyline ›
- Doxycycline ›
- Lamotrigine ›
- Fluoxetine ›
- Methotrexate ›
- Acetaminophen, Codeine ›
- Gabapentin ›
- Amphetamine ›
- Pregabalin ›
- Isotretinoin ›
- Dextroamphetamine ›
- Azithromycin ›
- Clonazepam ›
- Quetiapine ›
- Omeprazole ›
- Amlodipine Besylate ›
- Methylene Blue ›
- Duloxetine ›
- Letrozole ›
- Buspirone ›
- Citalopram ›
- Ciprofloxacin ›
- Naproxen ›
- Bisoprolol ›
Showing the 60 most looked-up of 2,817 medications checked with no known interaction — see the full Phosphate Salts list.
Phosphate Salts References
The 23 references that drive our Phosphate Salts monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
- Hill AG, Teo W, Still A, et al. Cellular potassium depletion predisposes to hypokalaemia after oral sodium phosphate. Aust N Z J Surg 1998;68:856-8. PubMed
- Clarkston WK, Tsen TN, Dies DF, et al. Oral sodium phosphate versus sulfate-free polyethylene glycol electrolyte lavage solution in outpatient preparation for colonoscopy: a prospective comparison. Gastrointest Endosc 1996;43:42-8. PubMed
- Fine A, Patterson J. Severe hyperphosphatemia following phosphate administration for bowel preparation in patients with renal failure: two cases and a review of the literature. Am J Kidney Dis 1997;29:103-5. PubMed
- DiPalma JA, Buckley SE, Warner BA, et al. Biochemical effects of oral sodium phosphate. Dig Dis Sci 1996;41:749-53. PubMed
- Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride. Washington, DC: National Academy Press, 1999. Available at: http://books.nap.edu/books/0309063507/html/index.html.
- Campisi P, Badhwar V, Morin S, Trudel JL. Postoperative hypocalcemic tetany caused by Fleet Phospho-Soda preparation in a patient taking alendronate sodium. Dis Colon Rectum 1999;42:1499-501. DOI
- Ell C, Fischbach W, Layer P, Halphen M. Randomized, controlled trial of 2 L polyethylene glycol plus ascorbate components versus sodium phosphate for bowel cleansing prior to colonoscopy for cancer screening. Curr Med Res Opin. 2014 Dec;30(12):2493-503. PubMed
- Jung YS, Lee CK, Kim HJ, Eun CS, Han DS, Park DI. Randomized controlled trial of sodium phosphate tablets vs polyethylene glycol solution for colonoscopy bowel cleansing. World J Gastroenterol. 2014 Nov 14;20(42):15845-51. PubMed
- Lee SH, Lee DJ, Kim KM, Seo SW, Kang JK, Lee EH, Lee DR. Comparison of the efficacy and safety of sodium phosphate tablets and polyethylene glycol solution for bowel cleansing in healthy Korean adults. Yonsei Med J. 2014 Nov;55(6):1542-55. PubMed
- Manukyan MN, Tolan K, Severge U, Attaallah W, Kebudi A, Cingi A. Prospective randomized comparison of oral sodium phosphate and sennoside A+B calcium lavage for colonoscopy preparation. Surg Laparosc Endosc Percutan Tech. 2011 Apr;21(2):90-3. PubMed
- van Vugt van Pinxteren MW, van Kouwen MC, van Oijen MG, van Achterberg T, Nagengast FM. A prospective study of bowel preparation for colonoscopy with polyethylene glycol-electrolyte solution versus sodium phosphate in Lynch syndrome: a randomized trial. F PubMed
- Choi NK, Lee J, Chang Y, Kim YJ, Kim JY, Song HJ, Shin JY, Jung SY, Choi Y, Lee JH, Park BJ. Acute renal failure following oral sodium phosphate bowel preparation: a nationwide case-crossover study. Endoscopy. 2014 Jun;46(6):465-70. PubMed
- Brunelli SM. Association between oral sodium phosphate bowel preparations and kidney injury: a systematic review and meta-analysis. Am J Kidney Dis. 2009 Mar;53(3):448-56. PubMed
- Schaefer M, Littrell E, Khan A, Patterson ME. Estimated GFR Decline Following Sodium Phosphate Enemas Versus Polyethylene Glycol for Screening Colonoscopy: A Retrospective Cohort Study. Am J Kidney Dis. 2016 Apr;67(4):609-16. PubMed
- Ladenhauf HN, Stundner O, Spreitzhofer F, Deluggi S. Severe hyperphosphatemia after administration of sodium-phosphate containing laxatives in children: case series and systematic review of literature. Pediatr Surg Int. 2012 Aug;28(8):805-14. PubMed
- Ori Y, Rozen-Zvi B, Chagnac A, Herman M, Zingerman B, Atar E, Gafter U, Korzets A. Fatalities and severe metabolic disorders associated with the use of sodium phosphate enemas: a single center's experience. Arch Intern Med. 2012 Feb 13;172(3):263-5. PubMed
- Nam SY, Choi IJ, Park KW, Ryu KH, Kim BC, Sohn DK, Nam BH, Kim CG. Risk of hemorrhagic gastropathy associated with colonoscopy bowel preparation using oral sodium phosphate solution. Endoscopy. 2010 Feb;42(2):109-13. PubMed
- Prescribing information: BALVERSA (erdafitinib) tablets. U.S. Food and Drug Administration. https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/212018s000lbl.pdf. [Accessed: February 26, 2021.]
- Hung SY, Chen HC, Ke TW, et al. Noninferiority clinical trial comparing the bowel cleansing efficacy of sodium phosphate tablets (Quiklean(®)) with a polyethylene glycol/bisacodyl kit. World J Gastroenterol 2021;27(5):428-441.
- Zuluaga-Gómez M, González-Arroyave D, Ardila CM. Kounis Syndrome Secondary to Laxative Administration. Case Rep Med 2022;2022:6087176. PubMed
- Product information for Lytgobi. Taiho Pharmaceutical Co., Japan. September 2022.
- Hamilton Smith R, Eddleston M, Bateman DN. Toxicity of phosphate enemas - an updated review. Clin Toxicol (Phila) 2022;60(6):672-680. PubMed
Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Metformin Is Linked to Lower Levels of 4 Nutrients
Natural Medicines records Metformin as a medicine that can lower these. This is not an interaction with Phosphate Salts — it is a separate effect of the medicine, and it is a reason some people are advised to supplement rather than to avoid one:
Read the full Metformin nutrient depletion report ›
Phosphate Salts is itself a nutrient we track — see which medications may deplete PHOSPHATE SALTS.
Depletion records come from the licensed Natural Medicines database. Do not start a supplement on the strength of this page — ask your pharmacist or doctor whether it applies to you.
Taking Phosphate Salts and Metformin Together: Common Questions
Is it safe to take Phosphate Salts with Metformin?
Do Phosphate Salts and Metformin have any of the same side effects?
How was the Phosphate Salts and Metformin combination checked?
Does Phosphate Salts interact with any other medications?
Does Metformin interact with any supplements?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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