Pentosan Polysulfate
Pentosan polysulfate sodium is an oral medication used to relieve bladder pain and discomfort caused by interstitial cystitis.
🧬 Where this information comes from Click to expand
The clinical label records used on this page are FDA-filed Structured Product Labeling (SPL) retrieved through openFDA. We identified 1 clinical label set within the page’s selected clinical scope after exact ingredient or ingredient-combination matching and applicable route/form matching. Forms, routes, brands, labelers, strengths, and NDC product-record counts are built separately from matching FDA National Drug Code Directory records. The linked DailyMed document is a representative official source for verification, not the page’s only clinical source. View the linked label on DailyMed →
📖 Pentosan Polysulfate: Patient Information Guide
A plain-language walkthrough of Pentosan Polysulfate — what it treats, how it works, how it’s taken, side effects, warnings and interactions. Tap any section to expand it.
🎯What it's used for▾
Pentosan polysulfate sodium is used to treat one confirmed condition in the supported product evidence:
- Interstitial cystitis: Elmiron (pentosan polysulfate sodium) oral capsules are FDA-approved specifically to relieve bladder pain and discomfort caused by interstitial cystitis, a chronic bladder condition.
⚙️How it works▾
Exactly how pentosan polysulfate sodium relieves bladder pain is not fully known. In preliminary studies, the drug appeared to adhere to the mucosal lining of the bladder wall — the inner surface that comes into contact with urine. It may work by acting as a protective buffer, blocking irritating substances in the urine from penetrating bladder cells and triggering pain. The drug also has anticoagulant (blood-thinning) and fibrinolytic (clot-dissolving) properties, though whether these contribute to its effect on interstitial cystitis symptoms is unclear.
💊How it's taken▾
Elmiron capsules are taken by mouth three times a day, spaced throughout the day. Each dose must be taken with water on an empty stomach — either at least 1 hour before eating or 2 hours after a meal. The effect of food on how the drug is absorbed is not fully known, which is why this timing is recommended.
- Take each dose with a full glass of water.
- Try to take doses at consistent times each day.
- Your prescriber will check your progress at 3 months — and again at 6 months if you haven't improved — to decide whether to continue treatment.
- Follow your prescriber's instructions closely; do not change your dose on your own.
🤒Side effects — in detail▾
Most people who take Elmiron tolerate it well, but some side effects do occur. Common ones reported include:
- Hair loss (alopecia)
- Diarrhea
- Nausea
- Headache
- Skin rash
- Stomach upset or indigestion (dyspepsia)
- Abdominal pain
- Dizziness
- Abnormal liver enzyme levels (seen in lab tests)
More serious reactions — including rectal bleeding, signs of unusual bruising or bleeding (due to anticoagulant effects), or any changes in vision — should prompt you to contact your doctor right away. Vision changes in particular can signal retinal damage that may be permanent.
⚠️Warnings & precautions▾
- Retinal pigmentary changes (pigmentary maculopathy): Long-term use of Elmiron has been linked to damage to the retina — the light-sensitive tissue at the back of the eye. These changes can be irreversible and may even progress after stopping the drug. Most cases have occurred after 3 or more years of use, but shorter exposure has also been reported. Watch for difficulty reading, slow adjustment to low light, or blurry vision. Eye exams — including retinal imaging — are recommended before starting treatment and periodically throughout.
- Anticoagulant (blood-thinning) effects: Pentosan polysulfate sodium can thin the blood and may increase the risk of bleeding, especially when combined with other blood thinners. Report unusual bruising, prolonged bleeding, or rectal bleeding to your doctor.
- Liver function: Abnormal liver enzyme levels have been reported. If you have pre-existing liver problems, discuss the risks carefully with your prescriber.
- Limited benefit window: If your pain has not improved after 6 months, the benefit of continuing treatment is uncertain. Discuss the risks and benefits of ongoing use with your prescriber.
🔀What it interacts with▾
Pentosan polysulfate sodium has anticoagulant properties, so it's especially important to watch for interactions with other medications that affect bleeding:
- Warfarin and other anticoagulants (blood thinners): Use with caution. Although a study showed warfarin's blood levels were not significantly changed by pentosan polysulfate sodium at standard doses, combining agents with anticoagulant effects may increase the risk of bleeding.
- Other therapies with anticoagulant effects: Tell your prescriber and pharmacist about all medications, including over-the-counter products and supplements, especially anything that may also thin the blood.
This is not a complete list of interactions. Always talk with your doctor or pharmacist before starting, stopping, or changing any medication.
📋Before taking it▾
- Allergy: Do not take Elmiron if you are allergic to pentosan polysulfate sodium, related compounds, or any inactive ingredient in the capsule.
- Eye conditions: Tell your doctor about any existing retinal or eye conditions before starting treatment — they may make it harder to monitor for drug-related retinal changes.
- Family history of hereditary eye disease: If you have a family history of hereditary pattern dystrophy (a genetic retinal condition), genetic testing should be considered before starting Elmiron.
- Liver problems: Use with caution if you have hepatic (liver) impairment, as the drug is metabolized partly in the liver. The pharmacokinetics of the drug in patients with liver impairment have not been formally studied.
- Kidney impairment: The drug's behavior in people with kidney disease has not been specifically studied — discuss this with your prescriber.
- Older adults: The drug has not been specifically studied in geriatric patients — your prescriber should assess the appropriate approach for you.
- Blood-thinning medications: Tell your doctor if you take warfarin or any other anticoagulant or medication that affects bleeding.
🚑If you take too much▾
Overdose with pentosan polysulfate sodium has not been reported in clinical practice. However, based on how the drug works, taking too much would most likely cause signs of excessive anticoagulation (increased bleeding risk), low platelet counts (thrombocytopenia), liver enzyme abnormalities, and stomach or digestive distress. If an overdose is suspected, the recommended approach is gastric lavage (stomach pumping) if possible, along with close observation and supportive care — contact emergency services or Poison Control right away.
📡Pharmacodynamics — effects in the body▾
Pentosan polysulfate sodium appears to adhere to the inner lining (mucosal membrane) of the bladder wall. It may protect bladder cells by acting as a buffer — essentially forming a barrier that prevents irritating substances in the urine from penetrating the bladder lining and causing pain. The drug also has measurable anticoagulant (blood-thinning) and fibrinolytic (clot-dissolving) effects, although the connection between these properties and its effect on bladder symptoms has not been established.
🔬Pharmacokinetics — how your body processes it▾
Only about 6% of an oral dose of pentosan polysulfate sodium is actually absorbed into the bloodstream — the majority passes through the digestive tract and is excreted in the stool unchanged. After absorption, the drug is metabolized (broken down) in the liver and spleen, and further processed by the kidneys. The drug clears from the body with a half-life (the time it takes for the body to eliminate half of it) of roughly 20 to 27 hours. Most of the absorbed portion is excreted in the urine as metabolites, with only a very small amount leaving the body as intact, unaltered drug.
📦How to store it▾
Store at 20 °C to 25 °C (68 °F to 77 °F); excursions permitted to 15 °C to 30 °C (59 °F to 86 °F). Keep out of reach of children.
📄 Written from Pentosan Polysulfate’s FDA-approved label information, summarized in plain language with AI, and reviewed by our pharmacy team before publication. Every point is grounded in that labeling — nothing is invented. How we use AI →
Supplements & herbs that interact with Pentosan Polysulfate
17 supplements and herbal products have documented interactions with Pentosan Polysulfate in the licensed clinical database we use. Most are manageable — but your pharmacist should know about everything you take, including vitamins and herbals.
- Major · 1
- Moderate · 7
- Minor · 9
Educational information from a licensed clinical database (Natural Medicines) — see our data sources & update cadence. Not medical advice: an interaction being documented does not mean it will happen to you; do not start or stop medications or supplements without professional guidance.
🩺 Pharmacist Counseling Corner
Quick, plain-English answers to the questions patients ask most about Pentosan Polysulfate — the kind of thing our pharmacy team would talk through with you at the counter.
What exactly is Elmiron used for? ▾
How long does it take for Elmiron to start working? ▾
Can Elmiron hurt my eyes? ▾
Should I take Elmiron with food or on an empty stomach? ▾
I take a blood thinner — is Elmiron safe for me? ▾
What side effects should I actually expect — and which ones mean I should call my doctor? ▾
Is Pentosan Polysulfate available over the counter? ▾
When was Pentosan Polysulfate first available? ▾
Who makes Pentosan Polysulfate? ▾
💬 Answers drafted from Pentosan Polysulfate’s FDA-approved label information, summarized in plain language with AI, and reviewed by our pharmacy team before publication. Grounded in that labeling — nothing is made up. How we use AI →
🧰 Keep exploring
💊 How Pentosan Polysulfate comes
Pentosan Polysulfate is available in 1 form. Different forms and brands can have different approved uses, doses, schedules, and directions. Follow the instructions for your exact product, and do not switch forms without guidance from your prescriber or pharmacist.
Capsule
How this form is used
- Elmiron capsules are used to relieve bladder pain and discomfort associated with interstitial cystitis.
- Elmiron capsules are taken three times daily by mouth.
- Elmiron should be swallowed with water at least 1 hour before meals or 2 hours after meals.
- Your prescriber will reassess whether Elmiron is working after 3 months of treatment.
- Do not change your Elmiron dose or stop taking it without talking to your prescriber first.
📊 Pentosan Polysulfate across the U.S. market
How Pentosan Polysulfate appears in the FDA’s National Drug Code Directory — including its dosage forms, strengths, brand names, manufacturers, and FDA-listed product records. These are directory records, not sales or prescription volume.
Also listed with the FDA, not a patient dose form: Powder (14) — bulk drug substance sold to compounders/manufacturers and multi-item kits. These aren’t counted in the dose-form total above.
Share of FDA-listed product records by manufacturer — FDA National Drug Code Directory. Record counts are not sales or prescription volume.
📈 How widely Pentosan Polysulfate is used
A general measure of how commonly Pentosan Polysulfate is prescribed, based on Medicaid — one of the largest public drug programs. The figure below is prescriptions filled in Q1–Q4 2025, summed across every form and brand of the drug.
Think of this as a proxy for how widely Pentosan Polysulfate is used, drawn from freely available public data. Medicaid is just one program — these numbers don’t include Medicare, other government coverage, or commercial and cash-pay prescriptions, so real-world use is higher than what’s shown here.
How commonly is Pentosan Polysulfate prescribed? Of the 1,596 medications we measure, Pentosan Polysulfate ranks #937 by Medicaid prescriptions — more than 41% of them.
Utilization by Pentosan Polysulfate product
Pick a product to see its own Medicaid numbers. Each chip is one clinical product — a specific strength & dosage form as defined by RxNorm — with brand-name and generic versions combined.
pentosan polysulfate 100 MG Oral Capsule
Summed across the 1 of 1 listed NDC products with Medicaid activity — every brand and generic of this exact strength & form. RxNorm 199498
Shares are of the Medicaid prescriptions shown here. Product grouping follows RxNorm (the National Library of Medicine’s drug terminology), so “one product” means one strength & dosage form regardless of manufacturer. Dollar figures are gross Medicaid reimbursement before mandatory rebates — rebates (often large, especially for brand-name drugs) are confidential, so actual net cost to Medicaid is lower than shown.
Source: Medicaid State Drug Utilization Data (CMS), aggregated by generic ingredient — summed across every NDC (all brands, strengths, salt forms and dosage forms) of Pentosan Polysulfate, and across all states and both fee-for-service and managed-care claims. A general popularity signal; it excludes Medicare, commercial insurance and cash prescriptions, so it is not total U.S. use. Based on the 1 of 1 listed Pentosan Polysulfate NDCs with Medicaid activity.
🔍 Compare Pentosan Polysulfate products
A representative set of FDA-listed product records for Pentosan Polysulfate — across manufacturers, strengths, and dosage forms, grouped by form with each product’s manufacturer and how the FDA approved it. The same medicine may be made and packaged by different companies, so a single drug can have many directory entries. (It’s also why a refill can look different — a new shape, color, or box — even though it contains the same medication.)
| Strength | Route | Manufacturer / Labeler | Category ⓘ | Details |
|---|---|---|---|---|
| 💊Capsule | ||||
| 100 mg | Oral | Janssen Pharmaceuticals, Inc. × 2 listings | NDA | View NDC → |
| 💊Bulk drug substance | ||||
| 1 kg/kg | — | Apicore Pharmaceuticals Private Limited | BULK INGREDIENT | View NDC → |
| 1 kg/kg | — | Aragen Life Sciences Limited | BULK INGREDIENT | View NDC → |
| 1 g/g | — | Darmerica, LLC | BULK INGREDIENT | View NDC → |
| 1 kg/kg | — | Indena SpA × 2 listings | BULK INGREDIENT | View NDC → |
| 1 g/g | — | Kalchem International inc | BULK INGREDIENT | View NDC → |
| 1 g/g | — | Letco Medical, Llc | BULK INGREDIENT | View NDC → |
| 1 g/g | — | Medisca Inc. | BULK INGREDIENT FOR HUMAN PRESCRIPTION COMPOUNDING | View NDC → |
| 10 kg/10 kg | — | Micro Labs Limited | BULK INGREDIENT | View NDC → |
| 1 kg/kg | — | Molclone Labs Private Limited | BULK INGREDIENT | View NDC → |
| 1 kg/kg | — | Professional Compounding Centers of America dba PCCA | BULK INGREDIENT FOR HUMAN PRESCRIPTION COMPOUNDING | View NDC → |
| 20 kg/20 kg | — | Sentio Biosciences, LLC | BULK INGREDIENT | View NDC → |
| 1 kg/kg | — | Swati Spentose Private Limited × 2 listings | BULK INGREDIENT | View NDC → |
Showing 16 of 16 products — FDA National Drug Code Directory. See every product, package size and price: browse all 16 Pentosan Polysulfate NDCs →
📈 What people report — real-world data (FDA FAERS)
After a medicine reaches the market, patients, doctors and drugmakers can send the FDA reports of problems they think may be linked to it. Here’s what’s been reported for Pentosan Polysulfate — a signal of what to watch for, not proof the drug caused it.
Source: openFDA, from the FDA Adverse Event Reporting System (FAERS). These are voluntary reports — they don’t prove the drug caused the effect, and counts reflect how often something was reported, not how often it actually happens. Reports also often name the very problem the medicine is taken for — a common reason to file one is that the drug didn’t help — so for a pain reliever you may see “pain” high on the list; that points to why the report was filed, not to the drug causing the symptom. This counts every report that lists Pentosan Polysulfate in any role, so the total runs higher than the FDA’s official dashboard, which counts only cases where the drug is the suspect. For the authoritative figures, see the FDA FAERS Public Dashboard. Always talk to your pharmacist or doctor.
🏛️ The road to your pharmacy
How Pentosan Polysulfate went from FDA review to the pharmacy shelf — the key milestones in its regulatory journey.
Source: Drugs@FDA.
🚨 Recall history
A recall is when a specific batch of a medicine is pulled from the market — usually a manufacturing issue, not a problem with the drug itself. Class I is most serious, Class III least.
Source: openFDA drug enforcement (recall) reports.
RxNorm Concept Web — From Ingredient to Every Form and Strength
This page starts with one ingredient concept (IN). The branches below show its dose-form concepts (SCDF), then the available clinical drug and strength concepts (SCD). Combination products remain separate concepts with their own pages.
RxCUI 155046 2 dose forms · 2 strengths
-
Dose form (SCDF) Injection RxCUI 2635090No current FDA listingClinical drug / strength (SCD) 7.5 ML pentosan polysulphate sodium 250 MG/MLRxCUI 2635091 -
Dose form (SCDF) Oral Capsule RxCUI 373284In current FDA listingsClinical drug / strength (SCD) 100 MGRxCUI 199498
Look up RxCUI 155046 in the RxCUI Atlas →
RxNorm is the U.S. National Library of Medicine’s normalized drug vocabulary. Its concept hierarchy can include forms that are not currently marketed; the status on each branch compares that concept with current FDA listings. RxCUIs identify vocabulary concepts, not individual packages or manufacturers.
📦 Supply & shortage status
Whether Pentosan Polysulfate is in short supply in the U.S. right now, plus any shortage history the FDA has on record. A shortage usually reflects a manufacturing or demand issue — not a safety problem with the drug.
Source: openFDA, from the FDA Drug Shortages database.
🏷️ Sold under these brand names
🏭 Manufacturers & labelers
RxNorm drug class
Pentosan Polysulfate belongs to the Glycosaminoglycan class.
Classified by RxNorm RxClass — the U.S. National Library of Medicine's standardized drug-classification service (Established Pharmacologic Class from the FDA, the ATC drug family from the WHO, and mechanism of action). Reference only, not medical advice.
🔬 Where this comes from
Core label, product, RxNorm, safety, and utilization data on this page come from the sources identified below. AI-written, editorial, and licensed sections are labeled separately.
How we combine label and product data
HelloPharmacist combines public FDA and NLM records; we don’t author the underlying clinical facts. We identified 1 FDA-filed SPL label set within the page’s selected clinical scope after exact ingredient or ingredient-combination matching and applicable route/form matching. The representative label is the starting point for the displayed reference monograph; the 12 largest stored in-scope SPL records, which may include that representative, are compared section by section, and the longest available version of each section is retained. Forms, routes, brands, labelers, product-listed strengths, and product-record counts are aggregated separately from ingredient-matched FDA NDC Directory records; package records listed above are associated with the linked SPL; and the normalized concept hierarchy comes from NLM RxNorm.
For canonical ingredient pages, bounded product-attributed indication and administration excerpts may be added to the AI evidence, and the generator is instructed to preserve available product, brand, route, and form qualifiers instead of treating one label as universal. Where a section is identified as AI-written, its plain-language text is generated from bounded label evidence. New draft drug pages remain in the admin review queue before first publication. Janssen Pharmaceuticals, Inc. is the representative DailyMed label linked for verification and dates; it is not the sole source used for the page.
This is general education, not medical advice — always consult your doctor or pharmacist about your medications and any medical condition. For the exact wording of the linked representative label, view that label on DailyMed; some displayed composite sections may come from other in-scope SPL labels. Learn how we use AI and our data sources & update cadence.