Major interaction on record — check this product against your medications before combining. Based on 1 of 3 ingredients. Check your meds →
Dietary supplement

Virt-Phos 250 Neutral Ingredients & Drug Interactions

by Virtus Pharmaceuticals

Virt-Phos 250 Neutral label
See full label image
Tablet Or Pill Category: Other Combinations
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 30, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Virt-Phos 250 Neutral against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Major

Virt-Phos 250 Neutral is a dietary supplement by Virtus Pharmaceuticals with 3 active ingredients. Its ingredients are commonly taken for low blood phosphate levels (hypophosphatemia), bowel preparation/laxative use, athletic performance ('phosphate loading').Based on those ingredients, 12 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Monobasic Potassium Phosphate. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Virt-Phos 250 Neutral by Virtus Pharmaceuticals

Ask about any prescription or over-the-counter medication and we check it for interactions with Virt-Phos 250 Neutral by Virtus Pharmaceuticals — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Virt-Phos 250 Neutral by Virtus Pharmaceuticals

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Sep 24, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 3 of its 3 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

Virt-Phos 250 Neutral contains three active ingredients, all phosphate salts: Dibasic Sodium Phosphate Anhydrous, Monobasic Potassium Phosphate, and Monobasic Sodium Phosphate Monohydrate. These work by supplying your body with phosphate — a mineral your cells need for energy, bone health, and other vital functions.

The product also contains several inactive ingredients (microcrystalline cellulose, croscarmellose sodium, stearic acid, magnesium stearate, and silicon dioxide) that help form and stabilize the tablet.

Does it work?

Strong evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Strong

Clinical evidence supports at least one of this product's ingredients for its stated purpose.

Why this rating?
  • The label markets this product for: Dietary supplement of hypophosphatemia.
  • We looked for evidence on: Hypophosphatemia.
  • The strongest evidence on file: Phosphate Salts is rated "Effective" for Hypophosphatemia (Natural Medicines).

Monobasic Potassium Phosphate, one of the active ingredients here, is rated effective for treating low phosphate levels (hypophosphatemia) and for bowel preparation before medical procedures. It's also rated likely effective for constipation, indigestion (dyspepsia), and high blood calcium (hypercalcemia).

The effectiveness of the other two phosphate salts in this product isn't established in the data we hold.

The evidence, ingredient by ingredient Phosphate Salts

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Phosphate salts are generally well tolerated when used as prescribed in the short term for healthy people — but the product facts caution that excess phosphate can harm your kidneys, heart, and mineral balance. Supplement use should be guided by your own healthcare provider, since dietary amounts are fine but taking extra requires professional oversight.

The most common side effects when taken by mouth are abdominal pain, diarrhea, bloating, nausea, headache, and vomiting. Low blood calcium (hypocalcemia) and high blood phosphate (hyperphosphatemia) can also occur.

A rare serious side effect is abnormal calcium deposits in soft tissues (extraskeletal calcification). Additionally, there's a risk of kidney injury in some patients, especially those who are female, have anemia or low body weight, are dehydrated, or have existing kidney disease.

Side effects, ingredient by ingredient Phosphate Salts

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Phosphate Salts.
  • The most serious interaction on file is rated Major.
  • For scale: 12 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before you start Virt-Phos 250 Neutral, double-check with your own doctor or pharmacist if you take erdafitinib (Balversa) or futibatinib (Lytgobi) — both are Major-severity interactions that raise your phosphate to dangerous levels. Also flag bisphosphonates (Fosamax and similar bone medications) — a Moderate-severity concern for low blood calcium.

We could not check two of the three ingredients in this product, so the complete interaction picture may not be visible here either.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Major medication interactions have been identified, and safety information is well characterized.

Virt-Phos 250 Neutral is meant to correct low phosphate levels or prepare your bowel for procedures — it's effective for those uses when prescribed. However, it carries Major-severity risks with two cancer medications (erdafitinib and futibatinib) and a Moderate risk with bone-health drugs (bisphosphonates), so you absolutely must check your exact medications with your own doctor or pharmacist before starting.

Supplement phosphate requires professional oversight to protect your kidneys and mineral balance.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 3 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Sep 21, 2018.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Virt-Phos 250 Neutral, straight from the product label.

Brand Virtus Pharmaceuticals
Barcode (UPC) 369543268101
Net contents 100 Tablet(s)
Market status On market
Date entered into DSLD Sep 21, 2018
DSLD ID 180560
Product type Other Combinations
Supplement form Tablet Or Pill
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years)
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Virt-Phos 250 Neutral by Virtus Pharmaceuticals, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Tablet(s)
Maximum serving Sizes:
2 Tablet(s)
UPC/BARCODE
369543268101
IngredientAmount% DV
Dibasic Sodium Phosphate Anhydrous852 mg--
Monobasic Potassium Phosphate155 mg--
Monobasic Sodium Phosphate Monohydrate130 mg--

Other ingredients: Microcrystalline Cellulose, Croscarmellose Sodium, Stearic Acid, Magnesium Stearate, Silicon Dioxide

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements

69543-268-10

Rx Made in USA

FDA Statement of Identity

Prescription Phosphorus Dietary Supplement

Formula

Supplying 250 mg per tablet

Each tablet yields approximately 250 mg (25% DV for adults) of phosphorus. 298 mg sodium (13.0 mEq), and 45 mg of potassium (1.1 mEq).

Description: Virt-Phos 250 Neutral is a prescription phosphorus dietary supplement - supplying 250 mg per tablet for use in the dietary supplement of hypophosphatemia and should be administered under the supervision of a licensed medical practitioner.

Precautions

Allergy: Product may be exposed to tree nuts, peanuts, fish, egg, wheat, milk, soy, and shellfish during manufacture. See prescribing information.

Precautions, contraindications, side effects: See prescribing information.

Keep out of reach of children

Call your licensed medical practitioner about side effects. You may report side effects by calling Vitrus at 1-888-848-3593 or FDA at 1-800-FDA-1088.

Suggested/Recommended/Usage/Directions

Directions for use: Virt-Phos 250 Neutral should be taken with a full glass of water, with meal and at bedtime. Adults: One or two tablets four times daily; Pediatric patients over 4 years of age: One tablet four times daily; Pediatric under 4 years of age: Use only as directed by a licensed healthcare practitioner.

Storage

Storage: Store at 20(0) to 25(0)C (68(0) to 77(0)F). Excursions permitted to 15(0) to 30(0)C (59(0) to 86(0)F). Protect from light and moisture. Dispense in a tight, light-resistant container. Notice: Contact with moisture may product surface discoloration or erosion.

General

Rev. 06/16

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Virt-Phos 250 Neutral by Virtus Pharmaceuticals label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Virt-Phos 250 Neutral label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Virt-Phos 250 Neutral by Virtus Pharmaceuticals

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size1 Tablet(s) Dosage formTablet Or Pill Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Dibasic Sodium Phosphate Anhydrous

852 mg per serving

Monobasic Potassium Phosphate

Interacts with
12 drugs
155 mg per serving

Phosphate salts are mineral compounds used mainly to correct low phosphate levels, as laxatives, and sometimes by athletes. Most people who eat a norm...

Monobasic Potassium Phosphate monograph & interactions

Monobasic Sodium Phosphate Monohydrate

130 mg per serving

Other (inactive) ingredients: Microcrystalline Cellulose, Croscarmellose Sodium, Stearic Acid, Magnesium Stearate, Silicon Dioxide. These complete the product’s ingredient list but are not active constituents.

Interaction report

Virt-Phos 250 Neutral by Virtus Pharmaceuticals Drug Interactions

Want to check YOUR meds against Virt-Phos 250 Neutral?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
12Drugs
2 Major 10 Moderate

Ingredients driving the most interactions

Monobasic Potassium Phosphate 12

Individual Drug Interactions

The ingredients in Virt-Phos 250 Neutral interact with 12 drugs. Click any drug to see the details.

1 of the 3 ingredients in Virt-Phos 250 Neutral interact with drugs. Each result below shows which ingredient is responsible. Monobasic Potassium Phosphate

Each ingredient & the kinds of drugs it affects

For each ingredient in Virt-Phos 250 Neutral with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Monobasic Potassium Phosphate3 drug types · 12 drugs

Erdafitinib (Balversa)

Taking erdafitinib with phosphate salts increases the risk of hyperphosphatemia.
Erdafitinib increases phosphate levels. It is recommended that patients taking erdafitinib restrict phosphate intake to no more than 600-800 mg daily.

Likelihood Probable Evidence A
Futibatinib (Lytgobi)

Taking futibatinib with phosphate salts increases the risk of hyperphosphatemia.
Futibatinib can cause hyperphosphatemia, as reported in 88% of patients in clinical studies. In addition, 77% of patients in clinical studies required use of a phosphate binder to manage hyperphosphatemia. Phosphate salts should generally be avoided by people taking this medication.

Likelihood Likely Evidence A
Bisphosphonates

Theoretically, taking phosphate salts with bisphosphonates might increase the risk of hypocalcemia.
Combining bisphosphonates and phosphate can cause hypocalcemia. In one report, hypocalcemic tetany developed in a patient taking alendronate (Fosamax) who received a large dose of phosphate salts as a pre-operative laxative.

Likelihood Possible Evidence D
Monobasic Potassium Phosphate full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Virt-Phos 250 Neutral, from the product label.

Virtus Pharmaceuticals

See all Virtus Pharmaceuticals products
Name
Virtus Pharmaceuticals, LLC
City
Tampa
State
FL
ZipCode
33619
Phone Number
1-888-848-3593
Pharmacist Counseling Corner

Virt-Phos 250 Neutral by Virtus Pharmaceuticals: Common Questions

Does Virt-Phos 250 Neutral by Virtus Pharmaceuticals interact with any medications?
Yes. Based on its ingredients, Virt-Phos 250 Neutral has a known interaction with 12 medications, including 2 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Virt-Phos 250 Neutral contains 3 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What is phosphate and why is it in this product?
Phosphate is a mineral your body needs for energy and bone health. This product supplies it in the form of phosphate salts to correct low phosphate levels in your blood or to prepare your bowel for procedures like colonoscopy.
Is it safe to take during pregnancy or while breastfeeding?
The evidence is mixed — phosphate salts are rated likely safe during pregnancy, but possibly unsafe during breastfeeding. Because the data is incomplete, talk with your own doctor or pharmacist about whether this product is right for you in either situation.
What are the most common side effects?
When taken by mouth, the most common side effects are abdominal pain, diarrhea, bloating, nausea, headache, and vomiting. Most people tolerate it well when used as prescribed, but your healthcare provider should monitor you if you're taking it as a supplement.
Can it hurt my kidneys?
Yes — the product facts caution that excess phosphate can harm your kidneys. Some patients, especially those with existing kidney disease, anemia, low body weight, or dehydration, are at higher risk of kidney injury. Your doctor should oversee supplement use and may monitor your kidney function.
Does it really work for constipation?
Monobasic Potassium Phosphate, one of the active ingredients, is rated likely effective for constipation. However, phosphate salts can go either way — they may cause diarrhea or, in some cases, constipation — so the net effect depends on the specific formulation and your body's response.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

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Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Virt-Phos 250 Neutral label
Go deeper

The Full Monographs Behind Virt-Phos 250 Neutral’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Phosphate Salts

Interacts with 12 drugs

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...

Read the full Phosphate Salts monograph →
Sources

Sources & How We Checked

Virt-Phos 250 Neutral's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 23 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Phosphate Salts 23 references
  1. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  2. 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
  3. 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
  4. 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
  5. DiPalma JA, Buckley SE, Warner BA, et al. Biochemical effects of oral sodium phosphate. Dig Dis Sci 1996;41:749-53. PubMed
  6. 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.
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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.]
  20. 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.
  21. Zuluaga-Gómez M, González-Arroyave D, Ardila CM. Kounis Syndrome Secondary to Laxative Administration. Case Rep Med 2022;2022:6087176. PubMed
  22. Product information for Lytgobi. Taiho Pharmaceutical Co., Japan. September 2022.
  23. Hamilton Smith R, Eddleston M, Bateman DN. Toxicity of phosphate enemas - an updated review. Clin Toxicol (Phila) 2022;60(6):672-680. PubMed

See these in context on the Phosphate Salts monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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