Pentosan Polysulfate Sodium

How it works

It is thought to act as a heparin-like agent that adheres to and helps restore the bladder urothelial glycosaminoglycan layer, reducing irritant penetration and bladder pain.

Prescribing in practice

• Long-term use has been associated with pigmentary maculopathy and visual impairment, so patients should have ophthalmic assessment and prompt review of new visual symptoms, in line with MHRA advice.
• As a weak anticoagulant it should be used cautiously in patients at increased risk of bleeding or undergoing procedures.
• Treatment response should be reviewed and continuation justified, with discontinuation if no benefit, per the SPC.

Monitoring

Monitor symptom response and bleeding risk, and arrange regular ophthalmological examination during long-term treatment.

Counselling the patient

• Attend recommended eye checks and report any change in vision, such as difficulty reading or adapting to dim light.
• It may take time to notice benefit; do not stop without discussing with your clinician.
• Report unusual bruising or bleeding.

Evidence & guidelines

Pentosan polysulfate sodium is a licensed option for interstitial cystitis, and the MHRA has advised on the risk of pigmentary maculopathy with long-term use.