Urethral bulking injections
A soft gel or paste is injected into the wall of the urethra to make small cushions that help it close, which reduces leaking with coughing, laughing, or exercise. It takes about 15 to 30 minutes, often in the clinic, with no cuts.
Also called bulking agent, urethral bulking agent, Bulkamid, polyacrylamide hydrogel, Macroplastique, Coaptite, Durasphere, transurethral bulking
- Where
- Clinic procedure room or outpatient surgery center
- Anesthesia
- Numbing gel in the urethra, sometimes with a small numbing injection beside it. Some women choose light sedation or anesthesia in an operating room.
- Time in the room
- About 15 to 30 minutes
- Hospital stay
- Same day. You go home once you have urinated.
- Going home with
- Usually none. A few women need a small catheter for a day or two if they cannot urinate.
- Back to normal
- 1 to 2 days
- Back to work
- Usually the next day
Overview
Stress urinary incontinence is leaking when pressure in the belly rises, such as with a cough, sneeze, laugh, lift, or jump. It happens when the urethra (the tube that carries urine out) does not close firmly enough at those moments. Bulking injections place small amounts of a soft, long-lasting gel into the wall of the urethra. The gel forms cushions that bulge into the channel and help it seal.
The injections are given through a short, rigid cystoscope (a camera tube) passed into the urethra, so there are no cuts. Many women have it in the office with numbing gel and go home within the hour.
Several products are used in the United States. A common one is Bulkamid, a water-based gel (polyacrylamide hydrogel). Others include Macroplastique (silicone particles in a gel) and Coaptite (tiny calcium-based particles in a gel). Your doctor will explain which one they use and why.
Bulking is less invasive than a sling and has a quicker recovery, but it is also less likely to make you completely dry, and the effect can fade over time. Many women need a second injection to get the best result. The AUA and SUFU guidelines list bulking as an option for women who understand this trade-off.
The parts of your body involved
The female urethra is a short tube, about 1.5 inches (4 cm) long, running from the bladder neck to its opening just above the vagina. It is kept closed by a ring of muscle in its wall (the urethral sphincter), a soft, spongy lining that seals like a gasket, and support from the pelvic floor muscles and the front wall of the vagina. Childbirth, aging, lower estrogen after menopause, and earlier surgery can weaken this closure. Bulking gel is placed just under the lining, in the upper to middle part of the urethra.
- Urethra
The short tube that carries urine from the bladder out of the body. The cushions are placed in its wall.
- Urethral sphincter
The ring of muscle in the urethral wall that keeps it closed.
- Bladder neck
Where the bladder narrows into the urethra.
- Pelvic floor muscles
A hammock of muscles that supports the bladder and urethra from below.
- Front wall of the vagina
Supports the urethra like a shelf. Weak support lets the urethra drop with straining.
- Bladder
Stores urine. Pressure on it rises with every cough or sneeze.
Why it’s done
Your doctor may suggest bulking if you leak with coughing, sneezing, or exercise and want a low-risk option with a quick recovery, or if you still leak after a previous operation. It treats stress leakage only. Leaking with a sudden urge is treated in other ways.
- Avoiding surgery or mesh
Some women prefer not to have a sling or other surgery, or do not want mesh.
- Health problems that make surgery riskier
Bulking can be done with numbing gel alone, which suits women with heart, lung, or other conditions.
- Leaking after a sling
Bulking can be added when some stress leakage continues after earlier surgery.
- A well-supported urethra that does not close well
Bulking may work especially well when the urethra does not move much with straining but its seal is weak.
- Future pregnancy
Many surgeons suggest waiting to have a sling until you have finished having children. Bulking can be an interim option.
Other options
- Pelvic floor muscle training
Exercises to strengthen the pelvic floor, ideally with a pelvic floor physical therapist. Many women improve, and it is the usual first step.
- Vaginal inserts and pessaries
Devices placed in the vagina that support the urethra during activity. Some are bought over the counter; others are fitted by a clinician.
- Midurethral sling
A narrow strip of mesh placed under the urethra through a small vaginal cut. More likely than bulking to make you dry and to last, with the risks of surgery and mesh.
- Burch colposuspension or a sling made from your own tissue
Operations without synthetic mesh that lift and support the urethra. Durable, with a longer recovery.
- Lifestyle changes and pads
Weight loss, treating a chronic cough or constipation, and using pads or absorbent underwear. Choosing not to have a procedure is reasonable.
Getting ready
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Weeks before
The day before
The day of
The procedure, step by step
Press play or pick a step. Each drawing shows what your surgeon is doing at that moment. Your team may do some steps differently.
1. Getting positioned
You lie on your back with your legs in padded supports. The area around the urethra is cleaned and covered with sterile drapes.
After the procedure
Right afterward
- Urinating before you leave
You must be able to urinate before going home. The first time usually burns and the stream may be slow.
- If you cannot urinate
A few women need a small catheter to drain the bladder for a day or two. This usually resolves quickly.
- Antibiotics
If you were given antibiotics to take home, finish them as directed.
- Going home
You can drive yourself after numbing gel alone. Someone must drive you after sedation.
At home
- Burning and spotting
Burning with urination and a little blood are common for 1 to 2 days.
- Urinating
Your stream may be slower than before. Sit fully on the toilet, relax, and take your time. Leaning forward can help.
- Fluids
Drink normally.
- Activity
Most women return to normal activities the next day.
- Showering and driving
You can shower the same day and drive the same day if you did not have sedation.
- Sex
Many teams suggest waiting a few days to a week, until any burning or spotting has settled.
- Pads
Keep using pads at first. Some leaking may return as swelling settles over the first week or two.
- Follow-up
A visit about 4 to 6 weeks later checks your result and decides whether a second injection would help.
- Work
Most women return to work the next day.
Recovery timeline
- Day 0Injection day
You go home once you have urinated. Some women notice less leaking right away.
- Days 1 to 2Burning and spotting
These fade quickly.
- Weeks 1 to 2Settling
Swelling goes down and the gel settles. Some leaking may return.
- Weeks 4 to 6Follow-up
You and your doctor decide whether you are satisfied or would like a top-up injection.
- Months 2 to 3Second injection, if needed
A top-up injection builds the cushions further.
- 1 yearChecking durability
Many women remain improved. Others notice leaking slowly returning.
- Long termOptions if leaking returns
Repeat injections are possible, or you can move on to a sling or other surgery.
What it feels like
Most women describe the procedure as uncomfortable more than painful, and quickly over. The harder part is often the hope and uncertainty: you may feel dry right away, then notice some leaking return as swelling settles, and wonder whether a second injection will be needed.
Lying in the stirrups
Exposed and embarrassed, even though you know the team does this every day.
What helpsAsk the team to talk you through each step. You will be covered as much as possible.
The injections
Pressure, a sting, and a sudden urge to urinate. It is over in a few minutes.
What helpsSlow breaths and relaxing your bottom and thighs help.
The first urination afterward
Burning, and a slower stream that may make you worry you are not emptying.
What helpsSit fully, relax, and give it time. Running a tap or leaning forward can help.
The first cough
The moment of truth. Many women feel relief; some feel let down if they still leak.
What helpsGive it a few weeks. The full result is judged at follow-up, and a top-up is often planned from the start.
The first week
Some leaking may return as swelling goes down, which can be discouraging.
What helpsKeep your diary. Small leaks now do not mean the treatment failed.
Deciding on a second injection
Mixed feelings about going through it again.
What helpsMost women find the second time easier because they know what to expect.
How well it works
Bulking reduces leaking for many women, but fewer become completely dry than with a sling. In studies, more than half of women say their leaking is much better or cured a year after treatment, often after a second injection. Results vary between products and between women, and the effect may fade over the years.
- Pad use and diary
Fewer pads and fewer leaks compared with your starting diary.
- Cough test
Your doctor may ask you to cough with a full bladder at follow-up.
- Top-up injection
Many women need a second injection to reach their best result.
- Durability
Some women stay improved for years; others need repeat injections or move on to surgery.
Risks
Every operation has risks. These are the ones people ask about most, with honest odds where good numbers exist. Your surgeon’s own results matter more than averages.
Common
For 1 to 2 days.
Usually mild and short-lived.
Often part of the plan to get the best result.
Burning, urgency, or cloudy urine in the days after. Treated with antibiotics.
Less common
Some women cannot urinate for a day or two and need a small catheter. It almost always resolves.
Sudden urges to urinate, usually temporary.
The benefit may fade over months to years.
Rare
Rarely, the material forms a tender lump or a sterile collection of fluid that may need draining.
Rare. May need treatment with a scope.
Very rare.
Call your care team or go to the emergency room if
- You cannot urinate at all, or only dribble, and your bladder feels full
- Fever of 101°F (38.3°C) or higher
- Burning, urgency, or cloudy, bad-smelling urine after the first 2 days
- Heavy bleeding or clots
- A painful swelling or tender lump near the urethra or in the front wall of the vagina
- Severe pain not helped by acetaminophen or ibuprofen
Questions to ask your surgeon
- Which bulking material do you use, and why?
- Will I have this in the office or in the operating room?
- How likely am I to need a second injection?
- How do my chances of success compare with a sling?
- What happens if I cannot urinate afterward?
- Will this make a sling harder if I need one later?
- How long does the effect usually last for your patients?
- Do I also have urge leaking that needs separate treatment?
- Will my insurance cover a repeat injection?
- How many of these procedures do you do?
Words you may hear
- Stress urinary incontinence
- Leaking urine with coughing, sneezing, laughing, lifting, or exercise.
- Urethra
- The tube that carries urine from the bladder out of the body.
- Bulking agent
- A gel or paste injected into the urethral wall to help it close.
- Polyacrylamide hydrogel
- A soft, water-based gel used in one common bulking product.
- Intrinsic sphincter deficiency
- Weak closure of the urethra itself, rather than poor support around it.
- Cystoscope
- A tube with a camera passed into the urethra and bladder.
- Bladder neck
- Where the bladder narrows into the urethra.
- Urge incontinence
- Leaking with a sudden, strong need to urinate.
- Mixed incontinence
- Having both stress and urge leakage.
- Post-void residual
- The urine left in the bladder after you urinate.
- Midurethral sling
- A narrow tape placed under the middle of the urethra to support it during coughs and strain.
- Pelvic floor muscle training
- Exercises that strengthen the muscles supporting the bladder and urethra.
Common questions
Is the gel permanent?
The materials used today are designed to stay in the tissue for a long time, and some are not absorbed at all. Even so, the effect can fade as tissues change, so some women need repeat injections.
Does it contain mesh?
No. Bulking agents are gels or pastes. There is no mesh.
Will I be dry right away?
Many women notice an improvement right away. Some leaking may return as swelling settles, and the final result is judged after a few weeks.
Can I still have a sling later?
Yes. Having bulking injections does not usually prevent a sling or other surgery later.
Does it help leaking with sudden urges?
No. Bulking treats stress leakage only. Urge leaking is treated with bladder training, medicines, or other options.
Is it a good option for older women?
Often, yes. Because it can be done with numbing gel and recovery is quick, it suits many older women and women with other health problems.
Sources this page draws on
- American Urological Association / SUFU, Updates to Surgical Treatment of Female Stress Urinary Incontinence (SUI): AUA/SUFU Guideline (2023)
- European Association of Urology, EAU Guidelines on Non-neurogenic Female LUTS
- Urology Care Foundation, Stress Urinary Incontinence (SUI)
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), Bladder Control Problems in Women (Urinary Incontinence)
- American Urogynecologic Society, Stress Urinary Incontinence patient fact sheet
Written November 2026. This page explains what usually happens. It is not medical advice and does not replace a conversation with your own surgeon, whose plan for you comes first.