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Pentosan Polysulfate (PPS)
FDA Approved
Also known as Elmiron, Cartrophen
Function
Primary
Interstitial cystitis · Osteoarthritis (off-label)
Secondary
Cartilage protection
Mechanism
Synthetic glycosaminoglycan analog — inhibits MMP enzymes; stimulates proteoglycan synthesis; anti-inflammatory; anti-fibrotic; supports synovial fluid quality.
Evidence
Clinical RCT (Limited)
Research
Phase II cartilage trials (Arthrogen); FDA approved IC only
Dosing
Range
100 mg TID (oral); 2 mg/kg IM (injection)
Frequency
3× daily (oral); weekly (IM)
Route
Oral · Intramuscular
Administration & Technique
Oral
For peptides formulated with absorption enhancers (SNAC) or small stable molecules.
DeviceTablet or capsule.
TechniqueSwallow whole with ≤120 mL plain water, on an empty stomach. Wait 30 min before food, other meds, or additional liquid (bioavailability collapses otherwise).
Intramuscular (IM)
Used for depot formulations, some GH secretagogues (localized delivery), and clinical protocols requiring faster systemic uptake.
Device23–25G × 1–1.5" needle. 1–3 mL syringe.
TechniqueVentrogluteal, vastus lateralis, or deltoid. Insert 90°, aspirate (optional), inject slowly. Rotate sites weekly.
Injection & Application Sites
Front
Back
Oral
Swallowed — no injection site
Intramuscular (IM)
- Ventrogluteal — Palm on greater trochanter, index to ASIS — inject in the V. Safest IM site.
- Dorsogluteal (upper outer) — Upper outer quadrant of the buttock. Used for depot IM; alternate sides each cycle.
- Upper arm / deltoid — Back of the upper arm for SubQ; 2 in below the shoulder bone for IM.
- Anterior thigh (vastus lateralis) — Middle third of the outer front thigh. Preferred IM site for self-injection.
Diagram is a general illustration, not a medical instruction. Rotate sites every injection, keep 1 in (2.5 cm) between recent sites, and avoid scars, moles, bruises and the navel area.
Cycling
Continuous oral for IC; injectable orthopedic cycles vary.
Timing & Interactions
When to take
Oral 100 mg 3× daily on an empty stomach (1 hr before or 2 hrs after meals).
Do not combine with
- ·Concurrent anticoagulants — bleeding risk
- ·Pentosan-associated maculopathy — annual eye exams
Complements
- ·Standard interstitial cystitis multimodal care
Storage & Reconstitution
Powder (Pre-Reconstitution)
Lyophilized powder: refrigerate 2–8°C for up to 24 months, or freeze at –20°C for extended storage. Keep sealed, desiccated, and protected from light.
After Reconstitution
After reconstitution with bacteriostatic water, refrigerate at 2–8°C and use within 28 days. Discard if cloudy, discolored, or precipitated.
Notes
Do not freeze after reconstitution — freeze/thaw cycles degrade most peptides.
Reconstitution Calculator
Concentration
2.50 mg/mL
Volume per dose
0.100 mL
Insulin syringe
10.0 units (U-100)
1 mL = 100 units on a standard U-100 insulin syringe. Draw to the nearest 0.5 unit and confirm dosing with a clinician before injection.
Your Notes
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Benefits
- ·Bladder pain relief in IC
- ·Possible joint/cartilage support
- ·Anti-inflammatory
Risks
- ·Macular pigment changes with chronic oral use
- ·Bleeding risk (anticoagulant)
- ·Alopecia
Contraindications
- ·Active bleeding disorders
- ·Pregnancy
- ·Retinal disease (caution)
Regulatory
FDA-Approved for IC; veterinary approved; off-label orthopedic use
Veterinary Use (Pets)
No established veterinary protocol for Pentosan Polysulfate (PPS). Consult a licensed veterinarian before considering off-label use in any species.
Full veterinary reference →Functional Groups
Cited Works
- Anger JT et al. Pentosan polysulfate sodium for interstitial cystitis. Cochrane Database. 2010.