Bladder Botox injections
A thin camera is passed into the bladder and small doses of Botox are injected into the bladder muscle to calm sudden urges and urge leakage. It is usually done in the office with numbing medicine, and the effect usually lasts about 6 to 12 months.
Also called Botox in the bladder, Botox for overactive bladder, onabotulinumtoxinA, botulinum toxin bladder injection, intradetrusor Botox, intravesical Botox, detrusor injection, chemodenervation of the bladder
- Where
- Clinic procedure room (sometimes an operating room)
- Anesthesia
- Numbing liquid placed in the bladder and numbing gel in the urethra (local anesthesia). Some practices offer light sedation.
- Time in the room
- About 30 to 45 minutes in the room, including time for the numbing to work. The injections themselves take about 5 to 10 minutes.
- Hospital stay
- Same day
- Going home with
- None for most people. A small number need to drain the bladder with a catheter for a while if it does not empty well.
- Back to normal
- The same day or the next day
- Back to work
- Usually the next day
Overview
Botox is a medicine made from a purified protein (botulinum toxin) that relaxes muscle. When it is injected into the muscle of the bladder wall, it quiets the sudden squeezes that cause a strong urge to urinate and leaking before you reach the bathroom. The small dose used in the bladder stays mostly where it is injected.
The injections are given through a cystoscope, a thin tube with a camera that goes in through the urethra (the tube that carries urine out of the body). No cuts are made on the skin. Most people have it in the office with numbing medicine and go home within an hour.
For overactive bladder the usual dose is 100 units, spread over about 20 small injections. People with neurogenic bladder from spinal cord injury or multiple sclerosis usually receive 200 units in about 30 injections. The effect builds over 1 to 2 weeks and usually lasts about 6 to 12 months. When symptoms return, the treatment is repeated.
The main trade-off is that Botox can relax the bladder so much that it does not empty well. A small number of people need to pass a thin catheter to drain the bladder for a while, until the effect eases. Your team will make sure you are willing and able to do this before you start.
The parts of your body involved
The bladder is a stretchy, hollow organ that stores urine. Its wall is mostly a muscle called the detrusor. Normally the detrusor stays relaxed while the bladder fills and squeezes only when you decide to urinate. In overactive bladder the detrusor squeezes on its own, often with little warning. Botox is injected into this muscle. The trigone, a triangle near the bladder outlet where the ureters (the tubes from the kidneys) enter, has many nerve endings. Many surgeons avoid it, while some include it.
- Bladder
A hollow, stretchy organ low in the belly that stores urine. Most adult bladders comfortably hold about 1.5 to 2 cups (about 350 to 500 mL).
- Detrusor muscle
The muscle layer of the bladder wall. This is where the Botox goes.
- Lining
The smooth inner surface of the bladder. The needle passes through it to reach the muscle just underneath.
- Trigone
A triangle at the base of the bladder between the two ureter openings and the bladder outlet. It is very sensitive.
- Urethra
The tube that carries urine out of the body. The scope goes in through it.
- Bladder nerves
Nerves from the lower spinal cord tell the bladder muscle when to squeeze. Botox blocks the chemical message between these nerves and the muscle where it is injected.
Why it’s done
Your urologist may suggest bladder Botox when urgency, frequent trips, or urge leakage still bother you after simpler steps, or when bladder pills cause side effects or cannot be used. U.S. guidelines from the American Urological Association (AUA) and the Society of Urodynamics, Female Pelvic Medicine and Urogenital Reconstruction (SUFU) list it as a standard option for overactive bladder and for neurogenic bladder. Newer guidance is flexible about the order of treatments, so you and your doctor can choose together.
- Urge leakage that has not improved enough
Bladder training, pelvic floor exercises and medicines help many people, but not everyone. Botox works in a different way and often helps when pills have not.
- Side effects from bladder pills
Some bladder medicines cause dry mouth, constipation, or blurred vision. Some older ones may affect memory in older adults. Botox avoids taking a daily pill.
- Neurogenic bladder
In spinal cord injury or multiple sclerosis, Botox lowers pressure inside the bladder, reduces leaks between catheterizations, and can help protect the kidneys.
- You already use a catheter
If you already drain your bladder with a catheter, the main risk of Botox (trouble emptying) matters much less.
- You prefer no implant and no weekly visits
Botox is a short office treatment repeated about once or twice a year. Nothing stays in your body.
Other options
- Lifestyle changes and bladder training
Cutting back on caffeine and alcohol, spacing fluids through the day, timed bathroom trips, urge-suppression techniques, and pelvic floor muscle exercises. These are safe and help many people, alone or together with other treatments.
- Medicines
Beta-3 agonists (such as mirabegron or vibegron) and antimuscarinic medicines (such as solifenacin, trospium, or oxybutynin) relax the bladder. They can be used alone or together.
- Percutaneous tibial nerve stimulation (PTNS)
A fine needle near the ankle sends mild pulses to the bladder nerves, in 12 weekly office sessions and then maintenance visits. Very low risk, but it takes time.
- Sacral neuromodulation
A small implanted device sends mild pulses to the nerves that control the bladder. You try it for a short test period first. It does not cause trouble emptying.
- Bladder augmentation
Major surgery that enlarges the bladder with a piece of bowel. It is used for a small number of people, mostly with neurogenic bladder, when the bladder stays small and high-pressure despite other treatment.
- Pads and watchful waiting
Overactive bladder is bothersome but not dangerous for most people. Using pads or other products and choosing not to have a procedure is a reasonable choice.
Getting ready
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1 to 2 weeks before
The day before and the morning of
At the clinic
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 on the procedure table. Women usually rest their legs in padded supports; men often lie flat. The nurse cleans the genital area and covers you with sterile drapes.
After the procedure
Right afterward
- Your first urination
It will likely burn and may look pink. This usually settles within a day or two.
- Emptying check
Some clinics scan your bladder after you urinate before you leave. Others wait for your follow-up visit.
- Antibiotics
If you were given antibiotics, finish them as directed.
- Follow-up booked
Most teams check how well your bladder empties about 1 to 2 weeks after the injections, usually with a quick ultrasound in the office.
- Going home
You can usually drive yourself home after local numbing. If you had sedation, someone needs to drive you.
At home
- Burning and blood
Burning with urination and pink urine are common for 1 to 3 days. Drink your usual fluids. Small clots may pass on the first day.
- Pain
Discomfort is usually mild. Acetaminophen and a warm pack on the lower belly help. Some doctors prescribe a medicine that numbs the urinary tract for a day or two; it turns urine orange.
- Activity
You can return to normal activities right away and exercise the next day.
- Driving and showering
You can drive the same day if you did not have sedation. You can shower the same day.
- Sex
Most people wait a day or two, until burning and bleeding have settled.
- Watch how you empty
Tell your team if you strain to urinate, have a weak stream, feel you never finish, pass only small amounts very often, or start leaking all the time. These can be signs that urine is staying behind.
- Your bladder pills
Ask whether to keep taking your bladder medicine. Some people stop once the Botox works; some continue at a lower dose.
- If you need a catheter
If the bladder is not emptying well, your team will teach clean intermittent catheterization: passing a thin catheter a few times a day to drain the bladder, then removing it. For most people this is temporary and stops as the effect eases.
- Work
Most people return to work the next day.
Recovery timeline
- Day 0Treatment day
The procedure takes under an hour, and you go home the same day.
- Days 1 to 3Settling down
Burning, pink urine, and frequent trips ease. Most people feel close to normal.
- Days 3 to 14The effect begins
Most people notice fewer and milder urges within 1 to 2 weeks.
- Weeks 1 to 2Emptying check
A bladder scan shows how much urine stays behind after you urinate. If it is high, your team discusses catheterization.
- Weeks 2 to 4Full effect
The benefit usually reaches its peak. A bladder diary shows how much has changed.
- Months 6 to 12Wearing off
Urges and leaks usually creep back gradually over weeks. This is the time to book the next treatment. Repeat treatments are given no sooner than 12 weeks apart.
- Long termRepeat treatments
Many people continue repeat treatments for years with a similar benefit each time. Your doctor may adjust the dose based on your results and side effects.
What it feels like
Most people say the worry beforehand was worse than the procedure. The numbing helps, and the injections feel like brief pinches or cramps low in the belly. The bigger emotional part is often the waiting afterward: hoping it works, and wondering whether you will need a catheter.
Waiting for the numbing to work
The liquid feels cool, then you notice a mild urge to urinate. Lying still for 15 to 30 minutes can feel long, and many people feel exposed and a bit embarrassed.
What helpsAsk for a blanket, bring headphones, and breathe slowly. The staff do this every day and will keep you covered.
The scope going in
A sting at the opening and a feeling of pressure or needing to urinate. Men often feel more pressure as the scope passes the prostate.
What helpsRelax your pelvic muscles as if you were starting to urinate, and take slow breaths. Tell the doctor if you need a moment.
The injections
Many people feel very little. Others feel quick pinches or a cramp like a period cramp, especially near the base of the bladder. It is over in a few minutes.
What helpsAsk the doctor to count down the injections out loud. Knowing how many are left makes it easier.
The first time you urinate afterward
Burning and a pink tinge, sometimes a small clot. It can be alarming the first time.
What helpsDrink a glass of water. The burning usually fades by the next day or two.
Waiting for it to work
The first week may bring little change, and frustration. Then, for most people, urges become less sudden and nights become calmer.
What helpsKeep a simple bladder diary so you can compare honestly with how things were before.
If you need to catheterize
Many people dread it, and some feel embarrassed or upset. After a few tries, most find it quick and painless, and it is usually temporary.
What helpsA nurse will teach you step by step. Slippery coated catheters make it easier, and women often find a mirror helps at first.
When it starts wearing off
Urges creep back over weeks. Some people feel disappointed even though they expected it.
What helpsBook the next treatment early. Repeat treatments usually feel easier because you know what to expect.
How well it works
Success means fewer sudden urges, fewer bathroom trips, and fewer leaks. In the large studies for overactive bladder, leaks dropped by about half or more on average, and about 1 in 4 people became completely dry after 12 weeks, compared with fewer than 1 in 10 people given a placebo (a dummy treatment). Many people who do not become fully dry still have a large improvement.
- Bladder diary
A record of trips, urges, and leaks for a few days before and after treatment is the best way to measure the change.
- Emptying check
A bladder scan 1 to 2 weeks after treatment shows whether urine is staying behind.
- How long it lasts
Usually about 6 to 12 months, though some people get more or less. The time often stays fairly steady from one treatment to the next.
- Neurogenic bladder checks
People with spinal cord injury or multiple sclerosis may have repeat urodynamic tests and kidney ultrasounds to confirm that bladder pressure is lower and the kidneys are safe.
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
Expected for a day or two after the injections.
Burning, urgency, cloudy urine, or fever in the weeks after treatment. This is why many teams give antibiotics around the procedure.
Botox can relax the bladder enough that it does not empty well. Some people need to use a catheter until the effect eases. The risk is higher with larger doses, in men with an enlarged prostate, and in people who already leave urine behind.
Less common
Some people notice little change. Your doctor may suggest a higher dose next time or a different treatment.
When emptying trouble happens, it can last until the Botox wears off. It always eases with time.
More than a pink tinge, usually clears with fluids. More likely if you take blood thinners.
Only in people with spinal cord injury at T6 or above: a sudden, dangerous rise in blood pressure triggered by the procedure. Your team monitors for it.
Rare
Very rarely, Botox can cause weakness away from the bladder: drooping eyelids, double vision, hoarse voice, or trouble swallowing or breathing. This can happen hours to weeks later and needs urgent care.
Rash, swelling, or trouble breathing soon after treatment.
A kidney infection or infection in the bloodstream that needs hospital care.
Call your care team or go to the emergency room if
- Fever of 101°F (38.3°C) or higher, or shaking chills
- You cannot urinate at all, or pass only dribbles, and your lower belly feels full and tight
- Burning, urgency, or cloudy, bad-smelling urine that starts after the first 2 or 3 days
- Heavy bleeding, thick blood like ketchup, or clots that block your urine
- New muscle weakness, drooping eyelids, double or blurry vision, hoarse voice, or trouble swallowing (call 911 for any trouble breathing)
- If you have a spinal cord injury: a pounding headache, flushing or sweating above the injury, or a sudden rise in blood pressure (this is an emergency)
- Pain in your side or back with fever (possible kidney infection)
Questions to ask your surgeon
- What dose will you use for me, and how many injections?
- Will I need antibiotics, and for how long?
- Should I stop my blood thinner or any other medicine beforehand?
- What is my chance of needing a catheter, and will you teach me before or after the treatment?
- When will you check how well my bladder is emptying?
- Should I keep taking my bladder pills afterward?
- How will we know if it worked? Should I keep a bladder diary?
- How long does the effect usually last for your patients?
- Will my insurance cover repeat treatments, and do they need approval each time?
- If this does not work well enough, what would we try next?
- Can I drive myself home?
Words you may hear
- Overactive bladder (OAB)
- Sudden, hard-to-delay urges to urinate, usually with frequent trips by day and night, with or without leaking.
- Urge incontinence
- Leaking urine with or right after a sudden urge.
- Detrusor
- The muscle in the wall of the bladder that squeezes to empty it.
- OnabotulinumtoxinA
- The medical name for Botox, the botulinum toxin approved in the U.S. for bladder treatment.
- Units
- The way Botox doses are measured. Units are not the same between different botulinum toxin brands.
- Cystoscope
- A thin tube with a camera and light that is passed through the urethra to look inside the bladder.
- Urethra
- The tube that carries urine from the bladder out of the body.
- Trigone
- A sensitive triangle at the base of the bladder between the ureter openings and the outlet.
- Post-void residual (PVR)
- The amount of urine left in the bladder right after you urinate, usually measured with a quick ultrasound.
- Urinary retention
- Being unable to empty the bladder fully, or at all.
- Clean intermittent catheterization
- Passing a thin catheter into the bladder to drain it, then removing it, several times a day.
- Neurogenic bladder
- Bladder problems caused by a nerve condition such as spinal cord injury, multiple sclerosis, or spina bifida.
- Bladder diary
- A simple record of when you urinate, how much, your urges, and any leaks.
- Autonomic dysreflexia
- A sudden, dangerous rise in blood pressure that can happen in people with a high spinal cord injury.
Common questions
Is this the same Botox used for wrinkles?
It is the same medicine, onabotulinumtoxinA, used at a different dose and in a different place. In the U.S. it is the botulinum toxin approved for the bladder. Other brands are not interchangeable unit for unit.
Does it hurt?
Most people describe brief pinches or cramps that are over in a few minutes. The numbing liquid and gel help a lot. If you are very anxious, ask whether light sedation is available.
Will I definitely need a catheter?
No. Most people never need one. With the usual dose for overactive bladder, about 6 in 100 people needed to catheterize for a time in the large studies. Your risk depends on how well you empty now and on your dose.
How soon will I notice a difference?
Usually within 1 to 2 weeks, with the full effect by about 2 to 4 weeks.
Can I keep getting it? Will it stop working?
Most people keep getting a similar benefit from repeat treatments for years. A small number find it works less well over time or stop because of infections or emptying trouble.
Will it affect the rest of my body?
The dose stays mostly in the bladder wall. Weakness elsewhere in the body is very rare, but it is serious, so call right away if you notice drooping eyelids, double vision, or trouble swallowing or breathing.
Can I use it together with my bladder medicine?
Yes. Some people continue a medicine, often at a lower dose, for extra benefit. Ask your doctor what makes sense for you.
Sources this page draws on
- American Urological Association / SUFU, The AUA/SUFU Guideline on the Diagnosis and Treatment of Idiopathic Overactive Bladder (2024)
- American Urological Association / SUFU, Adult Neurogenic Lower Urinary Tract Dysfunction: AUA/SUFU Guideline (2021)
- Journal of Urology (Nitti and colleagues), OnabotulinumtoxinA for the treatment of patients with overactive bladder and urinary incontinence: results of a phase 3, randomized, placebo controlled trial (2013)
- JAMA (Amundsen and colleagues), Effect of intradetrusor onabotulinumtoxinA vs sacral neuromodulation on urgency urinary incontinence among women (ROSETTA trial) (2016)
- U.S. Food and Drug Administration, BOTOX (onabotulinumtoxinA) prescribing information
- Urology Care Foundation, Overactive Bladder (OAB)
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.