At a glance
Botox injection for anal fissure is a temporary treatment — the effects last for a limited period, typically two to four months. For many people, this window is enough: the fissure heals while the sphincter is relaxed, and symptoms do not return. But for others, the botox wearing off is a significant moment — the point where they discover whether the healing has stuck or whether further treatment is needed.
This guide covers what the wearing-off process feels like, the signs to watch for, and the options available if symptoms return.
The timeline
Botox (botulinum toxin) works by temporarily paralysing the internal anal sphincter muscle, reducing the spasm that prevents fissure healing. The effects follow a general pattern:
- Weeks 1 to 2: Botox reaches full effect
- Weeks 2 to 12: Period of maximum effect — reduced sphincter tone, improved blood flow, fissure healing window
- Weeks 12 to 16: Effects begin to diminish as the muscle gradually regains function
- Beyond 16 weeks: Most of the botox effect has worn off; sphincter tone returns to baseline
These timelines are approximate. Individual variation is significant.
Signs the botox is wearing off
People describe a gradual return rather than a sudden change:
Early signs
- A subtle increase in sphincter tightness — the background looseness that the botox provided begins to fade
- Bowel movements that require slightly more effort or cause slightly more discomfort
- A return of mild post-BM symptoms that had been absent during the botox period
- These changes may be so gradual that people are not sure if they are real or imagined
More noticeable signs
- Clear return of tightness or gripping sensation during bowel movements
- Post-bowel-movement burning or spasm reappearing
- Stool types that were comfortable during the botox window becoming uncomfortable again
- Needing to restart or intensify self-care measures that had been eased
The critical question
The key question at this point is: has the fissure healed?
If the fissure has healed during the botox window, the return of normal sphincter tone should not cause problems. There may be a temporary adjustment period, but symptoms should not return in a meaningful way.
If the fissure has not fully healed, the returning sphincter spasm will act on the still-present fissure, and symptoms are likely to return.
Scenario 1: the fissure has healed
For people whose fissure healed during the botox period, the wearing-off process is typically uneventful:
- Some mild awareness of increased sphincter tone — not painful, just noticeable
- Bowel movements that feel slightly different but not distressing
- A period of heightened vigilance and anxiety about recurrence
- Gradual realisation over weeks that the healing has held
People in this group describe the main challenge as psychological — managing the anxiety that the pain will return. Maintaining the self-care habits developed during the botox period (fibre, water, sitz baths, good toilet posture) provides both practical protection and psychological reassurance.
Scenario 2: symptoms begin to return
For people whose fissure has not fully healed, or who have re-torn, the wearing-off period brings a return of familiar symptoms:
- Pain during bowel movements that increases over days to weeks
- Return of post-BM burning or spasm
- Bleeding that resumes
- The emotional weight of returning to a painful cycle after a period of relief
This is a difficult moment. People describe a range of emotions: disappointment, frustration, grief for the pain-free period, and anxiety about what comes next.
Options when symptoms return
Continued conservative care
If the fissure was partially healed and symptoms are returning mildly, some people choose to intensify conservative measures:
- Restarting or increasing topical treatments
- Strict stool management
- Consistent sitz bath routine
- Sphincter relaxation techniques
This approach may be sufficient for partial or mild recurrence.
Second botox injection
Many surgeons offer a second injection, particularly if the first provided significant benefit:
- Some people who had partial response to the first injection respond better to a second
- The second injection gives the fissure another healing window
- Some surgeons adjust the dose or injection technique for the second round
- Success rates for a second injection are generally reasonable
Surgical options
If botox (one or two rounds) has not achieved lasting healing, surgical options become part of the conversation:
- Lateral internal sphincterotomy (LIS) — a small, permanent cut in the internal sphincter to reduce tone. Higher success rates than botox but carries a small risk of continence changes
- Fissurectomy — removal of the chronic fissure tissue, sometimes combined with botox or a sphincterotomy
- Fissurectomy with advancement flap — for complex or recurrent cases
The decision between these options depends on individual factors and should be discussed with your surgeon.
Protecting the healing
Whether the botox has achieved full healing or not, maintaining self-care habits as the botox wears off is important:
- Continue adequate fibre and water intake
- Do not let stool management slip as you feel better
- Continue sitz baths, at least after bowel movements
- Maintain good toilet posture and avoid straining
- Keep a brief symptom log so you can track any changes objectively
The botox wearing off is a period that benefits from extra attention to the basics, even if everything feels fine.