Pentosan Polysulfate for Bladder Pain: The Eye Exam Warning on the Label

Interstitial cystitis, also called bladder pain syndrome, causes pressure and pain in the bladder and an urgent, frequent need to urinate. Our guide to interstitial cystitis explains the condition. Pentosan polysulfate is a pill approved for relief of the bladder pain or discomfort it causes.¹ Many women have taken it for years, so the label’s eye warning matters.

The eye warning

Long-term use has been linked to changes in the retina called pigmentary maculopathy.¹

• Most cases occurred after 3 or more years of use, but some happened sooner.¹
• The total amount taken over time appears to be a risk factor.¹
• Reported symptoms included trouble reading, slow adjustment to dim light, and blurred vision.¹
• The changes may be permanent and may keep progressing even after stopping.¹

Eye checks the label suggests

1. Tell your prescriber about any eye conditions before starting, and any family history of inherited retinal disease.¹
2. Get a baseline retinal exam, including imaging such as OCT and autofluorescence, within six months of starting.¹ People with existing eye conditions should have it before starting.¹
3. Repeat the exams regularly while you take it.¹
4. Report any vision change.¹
5. If changes appear, talk with your prescriber about whether to continue.¹

Tell your eye doctor the name of the medicine and how long you’ve taken it.

Other label checks

• Bleeding. It’s a weak blood thinner. Bruising, nosebleeds, bleeding gums and rectal bleeding have been reported.¹ Be careful with warfarin, heparin, high-dose aspirin or anti-inflammatory pain relievers, and tell your clinicians before any procedure.¹
• Hair loss, usually a single patch on the scalp, has been reported early in treatment.¹
• How it’s taken: 100 mg three times a day with water, at least 1 hour before or 2 hours after meals.¹
• Check-in at 3 months. If you’re not better and side effects aren’t a problem, it may be continued another 3 months. The benefit of continuing past 6 months without improvement is unknown.¹

Other options

Our guide to bladder hydrodistension covers a procedure option, and our article on caffeine and the bladder covers diet triggers.

Try: “I’ve taken pentosan for five years. Have I had the retinal imaging the label suggests, and is it still helping enough to keep taking?”

Laugh, Sneeze, Jump includes an appointment prep sheet. Use it to note how long you’ve taken each bladder medicine, any vision changes and your pain levels.