At a glance
Botulinum toxin (commonly known as Botox) injection is a treatment option for chronic anal fissures that have not healed with conservative care or topical treatments. It works by temporarily relaxing the internal sphincter muscle, reducing the spasm that prevents healing.
This page covers what the procedure involves, what people report about their experience, recovery patterns, effectiveness, and what happens when botox does not work.
What the procedure involves
Botox for fissure is a relatively quick procedure. People commonly describe:
- The injection being done in a clinic or hospital setting
- Sedation or local anaesthesia used for comfort
- The procedure itself taking only a few minutes
- Going home the same day
- No surgical wound — just the injection site
The botox is injected into the internal sphincter muscle near the fissure. Your doctor will explain the specifics of how it will be done in your case.
What people report about the experience
People describe the procedure and immediate aftermath in various ways:
- Before — anxiety about the injection is common, especially for people already dealing with significant pain
- During — most people say the procedure itself was quicker and less uncomfortable than they expected
- Immediately after — some people notice a reduction in spasm within the first few days. Others say it took a week or two to feel the effect.
- The relief — many people describe the reduction in sphincter spasm as noticeable. Bowel movements become less painful as the muscle relaxes.
Recovery timeline
Recovery from botox injection is generally straightforward:
- Days 1 to 3 — mild soreness at the injection site is common. Most people resume normal activities within a day or two.
- Week 1 to 2 — the botox begins to take full effect. People often notice reduced pain with bowel movements.
- Weeks 2 to 12 — the window where the sphincter is relaxed and the fissure has its best chance to heal. Conservative care (fiber, hydration, sitz baths) remains important during this time.
- After 2 to 3 months — the botox effect gradually wears off. If the fissure has healed, the sphincter returns to normal function.
Effectiveness patterns
People report varied outcomes with botox treatment:
- Many people heal — a significant number of people report that their fissure heals during the relaxation window provided by botox
- Some need repeat treatment — if the fissure has partially healed or recurs after the botox wears off, a second injection may be recommended
- Results are not guaranteed — not everyone responds to botox. Some people see improvement but not complete healing
- Conservative care matters — people who maintain good fiber intake, hydration, and sitz bath routines alongside botox tend to report better outcomes
Repeat treatments
Some people need more than one round of botox. What people report:
- A second injection is fairly common and often discussed as part of the treatment plan
- Some people respond better to the second treatment than the first
- There is typically a limit to how many rounds are recommended before considering surgical options
- Your doctor can advise on whether repeat treatment makes sense for your situation
When botox does not work
For some people, botox does not result in healing. This can be discouraging, but there are next steps:
- It does not mean nothing will work — botox not working does not predict the outcome of other treatments
- Surgery may be discussed — LIS (lateral internal sphincterotomy) is often the next option considered for fissures that have not responded to botox
- The decision is yours — your surgeon should explain the risks and benefits so you can make an informed choice
- Conservative care continues — regardless of what comes next, fiber, hydration, and sitz baths remain the foundation
What tends to help
- Maintaining fiber, hydration, and sitz bath routines throughout the botox treatment window
- Not assuming the botox alone will do the work — it creates the conditions for healing, but self-care supports it
- Keeping a symptom journal during the treatment period to share with your doctor
- Being patient — the full effect may take 1 to 2 weeks to develop
What tends to make things worse
- Stopping conservative care because the botox is “doing its job”
- Expecting instant results — the relaxation effect builds over days
- Straining or allowing stools to become hard during the treatment window
- Delaying follow-up if symptoms are not improving
Talking to your doctor
Before the procedure, useful questions to discuss:
- How many botox treatments do you typically recommend before considering surgery?
- What success rate do you see in your practice?
- What should I watch for during recovery?
- How will we know if the treatment has worked?
After the procedure, contact your doctor if:
- Pain is not improving after 2 weeks
- You notice any unexpected changes in bowel control
- Symptoms worsen rather than improve
If you experience severe pain, heavy bleeding, fever, or symptoms that concern you, seek medical care.