Skip to content
Urology Associates of Cape Cod — home

InterStim Therapy

InterStim is like a pacemaker for the bladder: a small implanted device gently stimulates the sacral nerves, which control the pelvis and its organs, helping the brain and bladder communicate properly. It's unique in that you test it first — a 6–8 day trial with a temporary external stimulator — before any permanent implant.

Important: your printed instructions are specific to you — if anything differs, follow your sheet or call (508) 771-9550, ext. 104.

Prints exactly what's on this page — or choose "Save as PDF" in the print window to keep a copy on your device.

Before the trial procedure

  • No blood thinners or aspirin-containing medications for 7 days before and 3 days after; Coumadin or Pradaxa stop 5 days before. Always coordinate with your prescribing physician. You may resume 1–3 days after, per your physician.
  • A urine culture is required one week before the procedure.
  • You'll be prescribed 12 antibiotic pills. Start the morning of the day BEFORE your procedure, then continue every 6 hours until they're gone. If you forget your antibiotics, the procedure is rescheduled.
  • Wear comfortable, loose-fitting pants (sweatpants are perfect).
  • Have a light meal before the procedure.
  • Your follow-up is 6–8 days later with the physician assistant, to remove the leads and review your results.

During the trial: what it feels like

A thin, flexible wire is placed near the sacral nerves through numbed skin and connects to a small stimulator worn at your waistband. Most people describe the sensation as a slight pulling or tingling in the pelvic area — it should never be painful.

Set the stimulation as high as comfortable — never to the point of discomfort — and ideally keep it on 24 hours a day. The wire can shift slightly as you move and heal, changing how the stimulation feels; adjusting the dial is normal. Some people don't feel it continuously — that's okay. The goal is symptom improvement.

Trial-week rules

  • No heavy lifting or vigorous exercise; avoid bending at the waist (bend at the knees), excessive twisting, and heavy housework.
  • No sexual relations during the trial.
  • Keep the dressing dry and in place — no showers or tub soaking; sponge baths are the safe way to stay clean. Reinforce the dressing with tape if needed, but don't change it.
  • Turn the stimulator off and unplug it before driving.
  • When moving to and from bed, couch, or car, avoid sliding across surfaces.
  • If the green light stops flashing, turn the dial off, wait 5 seconds, and turn it back on; if it still won't flash — or the yellow BAT light shows — replace the 9-volt battery.