CalcMyPeptide
Clinical / PharmaceuticalAlso known as: Elmiron, PPS, SP-54, Cartrophen

Pentosan Polysulfate

Pentosan Polysulfate (Elmiron) is a highly specialized, semi-synthetic heparinoid structurally similar to the body’s natural mucosal lining. Remaining the only FDA-approved oral weapon against the excruciating pelvic pain of Interstitial Cystitis (IC), it is deployed to literally spackle over and repair profound acid burns within the bladder wall. Additionally, in elite veterinary medicine (Cartrophen), it is injected to massively halt severe arthritic joint degradation.

Reviewed by CalcMyPeptide Editorial Team
Last updated: April 2026Evidence: Moderate1 peer-reviewed citation

Quick Stats

Half-Life~4.8 hours (oral); longer intramuscular
Dose Range100 mg 3× daily (oral) or 2 mg/kg IM
Frequency3× daily (oral) or 1-2× weekly (IM)
Vial SizesN/A (oral)
Bioavailability~6% oral; IM superior
Year Developed1996 (FDA approval)

Scientific Data

Molecular Formula
C5H8O10SNa (repeating unit — polysaccharide)
Molecular Weight
4000–6000 Da (variable polysaccharide)
CAS Number
37319-17-8
Developer
Bene Pharmaceetical / Parsons (Elmiron)

Mechanism of Action

Pentosan Polysulfate Sodium (PPS, Elmiron®) is a semi-synthetic polysaccharide derived from beechwood hemicellulose. While not a traditional peptide, it is frequently researched alongside peptide therapies for musculoskeletal and joint conditions. It acts as a glycosaminoglycan (GAG) analog — coating damaged cartilage surfaces, inhibiting proteolytic enzymes (MMPs), reducing chondrocyte death, and stimulating proteoglycan production. FDA-approved for interstitial cystitis since 1996. Off-label veterinary use for equine and canine osteoarthritis is extensive. Recent research into human joint injection protocols is ongoing.

Source: PMID: 2206774

Dosing Protocol

Typical Dose100 mg 3× daily (oral) or 2 mg/kg IM
Frequency3× daily (oral) or 1-2× weekly (IM)
Half-Life~4.8 hours

Dosing Protocols

Oral (FDA-approved IC)

Dose
100 mg
Frequency
Three times daily (oral, on empty stomach)
Note: Elmiron protocol for interstitial cystitis. 3-6 months to assess response.

IM/SC (Joint Research)

Dose
1-3 mg/kg
Frequency
Once or twice weekly (IM)
Note: Off-label joint injection research doses (extrapolated from veterinary protocols).

Administration

Route
Oral (standard); IM injection (joint research protocols)
Timing
Oral: Empty stomach, 1 hour before or 2 hours after meals.
Fasting Required?
Yes — inject on an empty stomach

Expected Timeline

Months 1-3
Reduction in bladder pain/frequency (IC indication). Joint symptom reduction begins.
Months 6+
Cartilage degradation slowing in OA models. Peak IC benefit.

Who Is It For?

Interstitial Cystitis

High

FDA-approved (Elmiron). First-line oral pharmacological treatment for IC.

Osteoarthritis / Joint Repair

Moderate

GAG-mimetic cartilage protection. Extensive veterinary evidence; human OA trials ongoing.

Safety & Considerations

FDA-approved orally (Elmiron). IMPORTANT: Retinal pigmentary maculopathy linked to chronic high-dose use (>1-3 years). Annual retinal screening recommended for long-term users. Rare aplastic anemia at high doses.

Regulatory & Legal Status

FDA Status (US)
Research Only
WADA Status (2026)
Not Listed

Not currently on the WADA 2026 Prohibited List. Policies may change — verify before competition.

Classification

Research Chemical

US Compounding: Not eligible / not available

⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.

Dosing Quick Reference

Pentosan Polysulfate— Dosing Guide
Dose Range
100 mg 3× daily (oral) or 2 mg/kg IM
Half-Life
~4.8 hours
Frequency
3× daily (oral) or 1-2× weekly (IM)
Route
Oral
Clinical / Pharmaceuticalcalcmypeptide.com

Frequently Asked Questions

Is pentosan polysulfate safe for long-term use?▼
FDA-approved pentosan polysulfate (Elmiron) has rare but serious maculopathy risk with long-term use. Annual ophthalmological retinal screening is now recommended for all patients on Elmiron for more than 3 years.
Does pentosan polysulfate work for osteoarthritis?▼
In animal models and limited human trials, injectable PPS reduces cartilage degradation markers and improves joint symptoms. It is not FDA-approved for OA in the US but is used off-label in veterinary medicine extensively.

References

  1. Ghosh P, Smith M “"Pentosan polysulfate sodium for OA: review of evidence".” Current Therapeutic Research (2019).

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