Fellowship-Trained Urogynecologist
Urogynecology & Reconstructive Pelvic Surgery
Green Bay, Wisconsin
✓ Medically reviewed May 14, 2026
What is a urethral bulking agent?
A urethral bulking agent is a gel-like material injected around your urethra to help it close more tightly. The goal is to reduce stress urinary incontinence, which is leaking when you cough, sneeze, or exercise. It is a minimally invasive outpatient procedure that can improve leaking without major surgery.
How it works
Stress incontinence happens when your urethra does not seal well enough during moments of physical pressure. Bulking agents add volume to the tissue around the urethra, which helps it close more completely.
Think of it as adding a gasket around a pipe that is not sealing properly. The material helps your urethra stay shut so urine stays in place when you cough, laugh, or exercise.
The procedure
We do this injection as an outpatient procedure:
- Local anesthesia numbs the area
- A small camera (cystoscope) is placed into the urethra so we can see the injection sites
- The bulking agent is injected at specific points around the urethra until the opening looks well sealed
- The whole procedure takes about 15 minutes
Most women go back to normal activities right away. You may notice improvement within days.
Who benefits most
Bulking agents can be a good fit for women who:
- Have stress incontinence and want to avoid surgery
- Have health conditions that make surgery higher risk
- Are on blood thinners that cannot be stopped safely
- Have had pelvic radiation in the past
- Are older or frail and prefer a less invasive option
- Want to try something between pelvic floor therapy and a sling
The AUA/SUFU guidelines list bulking agents as one of four recommended surgical options for stress incontinence. You do not have to “fail” other treatments first. That said, we always talk through all your options so you can choose what fits best.
What agent do we use?
Several bulking agents are available. The one with the best safety and durability data is polyacrylamide hydrogel (Bulkamid). It is about 97.5% water and 2.5% hydrogel. The material allows blood vessels to grow into it from the surrounding tissue, which helps it stay in place.
Older agents like collagen and some synthetic beads have been withdrawn due to problems with erosion or particle migration. Current agents are much safer.
Results and what to expect
- About 20 to 30 percent of women achieve full cure at 1 to 3 years
- In a 7-year study of 388 women using Bulkamid, 65.5% maintained improvement or cure
- Women who respond well tend to keep their improvement over time
- Some women need a repeat injection down the road (repeat rates range from 10% to over 60% depending on the study and agent used)
- A sling has higher cure rates, but bulking is far less invasive
- Complication rates are low. In one trial comparing Bulkamid to a retropubic sling, complications were 2.1% versus 7.6%
Patient satisfaction tends to be high even when full cure is not achieved. For many women, meaningful improvement in leaking is enough to make a real difference in daily life.
Things to consider
- Not as durable as a sling, though Bulkamid has improved this significantly
- You may need repeat injections
- Less effective for severe stress incontinence
- Works best as part of a treatment plan we build together
- Having a bulking injection does not limit your future options. If you later want a sling, it is still safe to place one
References
- Fleischmann N, Chughtai B, Plair A, et al. Urethral bulking. Urogynecology. 2024. doi:10.1097/SPV.0000000000001548
- Collins SA, Swift S, Jha S, et al. Joint report on terminology for surgical procedures to treat stress urinary incontinence in women. Female Pelvic Med Reconstr Surg. 2020. doi:10.1097/SPV.0000000000000831
- Kobashi KC, Albo ME, Dmochowski RR, et al. Surgical treatment of female stress urinary incontinence: AUA/SUFU guideline. J Urol. 2017. doi:10.1016/j.juro.2017.06.061
- Wu JM. Stress incontinence in women. N Engl J Med. 2021. doi:10.1056/NEJMcp1914037
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