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Stool softeners for anal fissure

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

At a glance

Stool softeners are one of the most important parts of fissure management. Hard stools re-injure the fissure with every bowel movement. Soft stools allow the fissure to heal. This guide covers the types available, how they work, and how to use them effectively.

Why soft stools matter

The fissure cycle: hard stool passes over the tear, re-injuring it. The re-injury causes pain and spasm, which reduces blood flow, which slows healing. By the time the next bowel movement arrives, the fissure has not had a chance to heal — and the cycle repeats.

Soft stools break this cycle. When stool passes without creating trauma, the fissure can begin to heal.

Types of stool softeners

Osmotic preparations

How they work: Draw water into the bowel, softening the stool.

Common examples: Macrogol (Movicol, Laxido), lactulose.

What people report: Effective and well tolerated. Macrogol is generally preferred over lactulose because it causes less bloating. The dose can be adjusted to achieve the right stool consistency.

Stool softeners (emollient)

How they work: Reduce the surface tension of the stool, allowing water to penetrate it.

Common examples: Docusate sodium.

What people report: Gentle and well tolerated. May be less potent than osmotic preparations for significant constipation. Often used alongside other measures.

Fibre supplements (bulk-forming)

How they work: Absorb water and add bulk to the stool, making it softer and easier to pass.

Common examples: Psyllium husk (Metamucil, Fybogel), methylcellulose.

What people report: Effective when taken with adequate water. Need to be introduced gradually to avoid bloating. Our psyllium guide covers these in detail.

Finding the right balance

The goal: stools that are soft and well-formed. Think type 3 or 4 on the Bristol stool scale — smooth, easy to pass, and formed (not liquid).

  • Too hard: Increase the softener dose, add more water, increase fibre
  • Too soft: Reduce the softener dose, add fibre to add bulk
  • Just right: Maintain the current approach

This balance takes trial and adjustment. It is normal to need a week or two to find the right combination.

Practical tips

  • Take softeners daily, not just when you feel constipated — consistency is key
  • Drink adequate water — softeners work by drawing water into the stool, so hydration is essential
  • Take them at the same time each day — builds a predictable routine
  • Do not rely on softeners alone — diet (fibre from food), hydration, and movement all contribute
  • Continue after the fissure improves — stopping too soon is the most common cause of recurrence

Common questions

What is the difference between a stool softener and a laxative?

Stool softeners (like docusate) work by drawing water into the stool, making it softer and easier to pass. They do not stimulate bowel movements. Laxatives are a broader category — some stimulate the bowel to push stool through (stimulant laxatives), some draw water into the bowel (osmotic laxatives), and some add bulk (fibre-based). For fissures, osmotic preparations and stool softeners are generally preferred because they soften without causing urgency or cramping.

How long should I take stool softeners?

For fissure management, stool softeners are typically used for the duration of active symptoms and often continued for several weeks after the fissure heals to prevent recurrence. Some people continue them long-term, particularly if they are prone to constipation. There is no standard timeline — it depends on your individual situation and your clinician's guidance.

Can stool softeners make stools too soft?

Yes. If stools become very loose or watery, the amount may be more than you need. Loose stools can irritate the fissure area just as hard stools can. The goal is stools that are soft and formed — easy to pass without straining, but not liquid. People commonly describe adjusting it with their pharmacist's or doctor's guidance to reach that balance.

Are stool softeners safe during pregnancy and breastfeeding?

Many stool softeners are considered safe during pregnancy and breastfeeding, but the specific safety profile varies by product. Discuss this with your doctor, midwife, or pharmacist to confirm which options are appropriate for your situation.

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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