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Second botox injection for fissure

Published 13 March 2026 ·Last reviewed 13 March 2026 by the editorial team ·How we create our content

At a glance

A second botox injection for an anal fissure is offered when the first injection provided partial benefit, or when the fissure healed but recurred. The decision involves weighing the likelihood of success against the alternative of surgery. This guide covers when a second injection makes sense and what to expect.

When a second injection is considered

Partial response to the first

The fissure improved but did not fully heal. The sphincter relaxed, the pain reduced, but the tear persisted. A second injection may provide the additional healing window needed.

Fissure recurred after the first

The fissure healed during the botox effect but returned after the botox wore off. A second injection gives another healing opportunity, often combined with renewed emphasis on stool management to prevent recurrence.

When a second injection is not typically offered

If the first injection provided no benefit — no sphincter relaxation, no pain reduction, no change in symptoms — most surgeons will discuss alternative approaches rather than repeating botox.

What to expect

The procedure is the same as the first injection:

  • Day case under sedation or general anaesthesia
  • Brief injection into the sphincter
  • Same recovery pattern
  • Same self-care requirements

The key difference is psychological. People describe less anxiety about the procedure itself (they know what to expect) but more anxiety about whether it will work.

Effectiveness

The evidence suggests:

  • People who had a partial response to the first injection have a reasonable chance of further improvement with a second
  • People who had a good response followed by recurrence may respond well again
  • The overall healing rate for a second injection is somewhat lower than for the first
  • A third injection is rarely offered — if two injections have not resolved the fissure, surgery is typically the next discussion

The surgery conversation

After a second injection — whether successful or not — the conversation about surgery becomes more prominent. This is not a failure of botox; it is a normal part of the treatment pathway. Botox is tried before surgery precisely because it is less invasive. Having tried it (even twice) gives both you and your surgeon better information about what your fissure needs.

Our guide on what to do when botox does not work covers the surgical options in detail.

Common questions

Is a second botox injection as effective as the first?

The evidence is mixed. Some people respond well to a second injection, particularly if the first provided partial improvement. Others find the second injection less effective than the first. There is also a theoretical concern about antibody development reducing effectiveness with repeated injections, though this is more relevant to cosmetic botox than the small doses used for fissures.

When is a second injection offered?

A second injection is typically offered when the first injection provided partial improvement but the fissure did not fully heal, or when the fissure healed but recurred after the botox wore off. If the first injection provided no benefit at all, most surgeons will discuss surgery rather than repeating the same approach.

How long should I wait between injections?

This varies by surgeon. Most recommend waiting at least three months between injections — allowing the first dose to fully wear off before assessing whether a second is appropriate. The timing is a conversation to have with your surgical team.

Should I just have surgery instead?

This is a very personal decision that depends on your specific situation. Some people prefer to try a second injection because it is less invasive and carries no permanent risk. Others, particularly those who had no response to the first injection, may feel surgery is the more direct path. Your surgeon can help you weigh the options.

When to seek care Heavy bleeding or feeling faint? Get emergency help now. Emergency: 911

Not sure how urgent it is? Get help today.

  1. Emergency

    Heavy bleeding, black tarry stools, feeling faint, severe pain or trouble breathing.

    Call 911 or go to the ER.

  2. Today

    Fever, pain getting worse, a hot swollen lump, or trouble passing urine.

    Call your doctor or go to urgent care.

  3. Soon

    Bleeding or bowel changes nobody has checked, or anything lasting 3 weeks.

    Book a doctor’s appointment.

Feeling overwhelmed? Call or text 988, any time.

See all the signs

For this topic, get medical advice if you notice:

  • Heavy or persistent bleeding that does not settle
  • Severe pain that is getting worse rather than better
  • Fever or signs of infection
  • Symptoms that have not improved after 4 to 6 weeks of self-care

Recording how you feel is not the same as being checked. These are the signs that need a doctor’s attention.

Call 911 or go to the emergency room now if you have:

  • bleeding that will not stop, a lot of blood (the toilet water turns red, or you pass large clots), or any bleeding with feeling faint or dizzy
  • fainting, a racing heart or trouble breathing
  • confusion or slurred speech, extreme shivering, no urine in a day, or blotchy skin
  • sudden severe belly pain, or a swollen, hard belly with vomiting or not passing stool or gas
  • you cannot pass urine at all, or your bladder feels full and painful and you can’t empty it
  • redness, swelling or severe pain spreading quickly around your anus, genitals or groin, especially with a fever or feeling very ill
  • a fever with a painful swelling near your anus if you have diabetes or a weakened immune system (for example, from chemotherapy or transplant medicines)
  • black, tarry stools

Call your doctor or go to urgent care today (or the ER if you can’t be seen today) if you have:

  • a temperature of 100.4°F (38°C) or higher, chills, vomiting, or feeling generally unwell
  • pain that is getting worse over days, or severe pain that stops you sitting or sleeping
  • a hot, swollen or very tender lump near your anus or at the top of the crease between your buttocks, or foul-smelling discharge
  • trouble urinating
  • bleeding that is getting heavier or more frequent, or blood mixed into your stool
  • feeling much more tired than usual, looking pale, or getting out of breath more easily than you used to
  • not passing stool for several days, or new belly pain

Make an appointment with your doctor if:

  • you have never had these symptoms checked by a doctor or nurse — whatever your age
  • you have had rectal bleeding for more than 3 weeks
  • your bowel movements have been looser, thinner or more frequent than usual for 3 weeks or more, or you have lost weight without trying
  • symptoms have not settled after a week or so, or keep coming back
  • you notice a new lump near your anus, between your buttocks or in your belly, or an itch or discharge that does not clear
  • you have new leakage or trouble controlling your bowels
  • you are 45 or over, or have a family history of bowel cancer or inflammatory bowel disease, and any of these symptoms are new for you

If you are unsure, it is always reasonable to ask. If things feel overwhelming, call or text 988 (Suicide & Crisis Lifeline) or chat at 988lifeline.org, any time. If you don’t feel safe, call 911.

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Related symptoms

BleedingPain during bowel movementsPain after bowel movementsSpasm or crampingConstipation

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For hemorrhoids, fissures, fistulas and other anal and rectal problems. A short, discreet email asks how things have been, and saves each answer, so you can look back at every flare and every good week in your own words. If you haven’t had your symptoms checked, see your doctor first.

  • About ten seconds a check-in. No app, no password.
  • Nothing in the subject or preview says what it’s about.
  • Each Sunday, a link to your week, ready for your next appointment.
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