At a glance
Topical treatments — typically GTN (glyceryl trinitrate, also known as Rectogesic) or diltiazem — are the most commonly prescribed first-line treatment for anal fissures. They work by relaxing the internal sphincter muscle, which improves blood flow and allows the fissure to heal.
The most common question people have: how long do I need to use this? The standard answer is six to eight weeks. But the practical reality is more nuanced than that.
The typical timeline
Weeks one to two: adjusting
The first week or two is often about adjusting to the treatment itself. Common experiences:
- Side effects settling — headaches from GTN, flushing from diltiazem — these often ease over the first week
- Learning the application technique — how much to use, where to apply, how to time it
- Minimal change in symptoms — most people do not notice significant improvement this early
- Maintaining the routine — applying two to three times daily as prescribed
This is the phase where people are most tempted to stop — the treatment has side effects, the fissure has not improved, and the routine is tedious. But the treatment has not had enough time to work yet.
Weeks two to four: early signs
Many people describe the first hints of improvement during this window:
- The post-bowel-movement pain lasts slightly less time
- The burning is slightly less intense
- Bowel movements are marginally less frightening
- The sphincter feels slightly less clenched
These changes are often subtle enough that people are not sure whether they are real or wishful thinking. A simple daily pain log can help — looking back at a week of scores often reveals improvement that was not obvious in real time.
Weeks four to six: clearer picture
By this point, the treatment’s effect is usually more apparent:
- People who are responding describe a noticeable reduction in pain and spasm
- The fissure may not be fully healed, but the trajectory is clearly improving
- Those who are not responding have a clearer signal that the treatment may not be sufficient
Weeks six to eight: completion or reassessment
Most prescriptions are for six to eight weeks. At this point:
- If healed or significantly improved — the treatment can be tapered and stopped per your prescriber’s guidance
- If partially improved — your prescriber may extend the course or consider additional measures
- If no improvement — this is the point to discuss escalation: a different topical treatment, botox, or surgical options
Common mistakes
Stopping too early
The most common pattern in fissure relapse stories: symptoms improve around week three or four, the person stops applying the treatment, and the fissure returns. The sphincter needs sustained relaxation to allow full healing. Pain relief is not the same as full healing.
Inconsistent application
The treatment works by maintaining a relaxed sphincter. Missing applications — particularly after bowel movements, which is when the sphincter is most likely to spasm — reduces effectiveness. People describe the difference between consistent and inconsistent use as significant.
Wrong technique
Applying too much, too little, or in the wrong location all affect outcomes. The standard approach is a pea-sized amount applied to the perianal skin (not pushed inside the canal) two to three times daily. Your prescriber can demonstrate or clarify the technique.
When to go back to your prescriber
- No improvement after four to six weeks of consistent, correct use
- Side effects that are intolerable — particularly severe headaches from GTN
- Symptoms that are getting worse despite treatment
- Relapse after completing a course — this may indicate a chronic fissure
- Uncertainty about whether the treatment is working — your prescriber can examine the fissure and assess healing
After the course
Once you have completed the treatment course and the fissure has healed, the focus shifts to prevention:
- Maintaining soft stools through diet and hydration
- Continuing fibre intake
- Sitz baths as needed
- Avoiding constipation triggers
- Being alert to early symptoms of recurrence — catching a relapse early and restarting treatment quickly improves outcomes