How to apply anal fissure cream correctly: where, how much and when

Why does the way you apply the cream matter so much?

In clinic we see the same pattern every week: a patient with a chronic fissure, a correct prescription for nifedipine or diltiazem, and four weeks of little progress. When we ask them to show us how they use it, the problem is often not the cream. It is a thick layer smeared on the outer skin once a day, or a dab pushed in with a long fingernail, or a tube that ran out in week three and was never refilled.

A fissure stays open because the internal anal sphincter is in spasm and squeezes the small vessels that feed the tear. Sphincter-relaxing ointments work by lowering that resting pressure for several weeks so the blood supply returns and the skin can close. The internal sphincter lies just under the lining of the lower anal canal, not on the skin of the buttocks. If the cream never gets past the anal verge, much of it is wasted on skin that does not need it.

The other half of the story is time. These ointments act slowly and only while you keep using them. Guidelines from the American Society of Colon and Rectal Surgeons (ASCRS 2023) and the British ACPGBI (2023) base their recommendation on regular use for 6 to 8 weeks. A perfect technique for ten days does less than a decent technique for eight weeks. You can read how the three main ointments compare in Nifedipine, diltiazem or nitroglycerin: which fissure ointment should you choose?.

How much cream should you use each time?

Less than most people think. The usual dose for a nifedipine or diltiazem ointment is a pea-sized amount, which is roughly a 2 cm strip squeezed onto the tip of your index finger. If your pharmacist or surgeon gave you a different measure (a dosing line, a marked applicator or a set number of grams), follow that: compounded creams are not all made at the same strength.

Why not more? Three reasons:

• The anal canal can only absorb so much. Extra cream ends up on the outer skin and your underwear.
• Side effects rise with the dose. With nitroglycerin, a larger amount means more chance of headache, which already affects up to half of patients. With nifedipine or diltiazem, more cream mainly means more local burning or itching.
• Thick layers trap moisture. That can irritate the skin around the anus and cause itching that you then mistake for the fissure getting worse.

If one tube or jar seems to last much less or much more than the prescription suggests, mention it at your next visit. It is a simple way to check whether the dose you are using is the one intended.

Do you apply fissure cream inside or outside the anus?

Inside, but not deep. The target is the first centimeter of the anal canal, just past the opening, where the fissure and the internal sphincter are. Here is the technique we teach in clinic:

1. Get into a comfortable position. Lying on your side with the top knee bent toward your chest works well, or standing with one foot on the edge of the toilet or bathtub.
2. Place the cream on the pad of your index finger, not on the nail side.
3. Touch the anal opening and wait a few seconds. Breathe out slowly as if you were about to pass gas: this relaxes the outer sphincter.
4. Slide the fingertip in gently, up to about 1 cm (roughly as far as the first crease of your finger, or less if it hurts), and spread the cream around the opening with a soft circular motion.
5. Withdraw the finger and spread what remains on the skin just outside.

Do not "stuff" the cream in with force, do not use cotton swabs or the tube nozzle to push it deep, and do not insert anything further than your fingertip. The fissure sits low in the canal, so pushing higher does not reach it better and can reopen the tear. If the pain is too intense to insert a fingertip at all, apply it on the opening itself for the first days and move a little further in as the spasm eases. Tell your surgeon if that stage lasts more than a week.

When and how often should you apply it?

Nifedipine and diltiazem ointments are used two to three times a day; nitroglycerin ointments, such as Rectogesic in the UK, Australia and Europe or Rectiv in the US, are usually prescribed twice a day. A simple schedule that fits most days:

Try to space doses evenly. If you miss one, apply it when you remember, and do not double the next dose. If you need a separate numbing gel such as lidocaine before going to the toilet, that one goes on a few minutes before the bowel movement; the sphincter relaxant goes after. Our guide on Lidocaine cream for anal fissure: why it eases the pain but does not close the tear explains how to combine them.

The sitz bath before the cream is worth the trouble: 10 to 15 minutes in warm water relaxes the sphincter and cleans without rubbing. Pat the area dry with a soft towel before applying. The details are in All guides.

Should you use a glove or finger cot?

Yes, ideally. A disposable nitrile glove or a finger cot (a small latex or nitrile sleeve for one finger, sold in pharmacies) does three jobs:

• Keeps the drug where it belongs. Nitroglycerin is absorbed through any skin, including your fingertip; a cot reduces the dose you take in through the hand and the risk of headache. The same logic applies, to a lesser degree, to nifedipine and diltiazem.
• Protects the tear. A smooth glove surface is gentler than skin with a rough cuticle.
• Makes hygiene simple. You remove it and throw it away.

Without a glove, wash your hands with soap before and after, and keep the nail of that finger short and filed. A sharp nail edge is enough to reopen a fissure that was starting to close. Wash your hands again before touching your eyes or contact lenses.

What mistakes stop the cream from working?

These are the ones we correct most often:

• Stopping at week 3 or 4 because the pain is gone. Pain relief comes first; the tear needs the full 6 to 8 weeks to close, and stopping early is a common reason it reopens.
• Skipping doses on busy days or when away from home. Once a day is not the same treatment as two to three times a day.
• Applying only on the outer skin and never inside the opening.
• Using too much, then stopping because of headache or burning.
• Ignoring the stools. No cream can protect a tear from hard stools or repeated diarrhea. Fiber, water and, if needed, a softener are part of the treatment; see All guides.
• Mixing creams on your own, for example adding a steroid hemorrhoid cream on top. Hydrocortisone should never be used for more than 7 days, and it thins the skin.
• Using an expired compounded cream. Compounded ointments have a shelf life set by the pharmacy; check the label and store it as instructed.

If after 4 weeks of correct use there is no change at all, read Four weeks on fissure cream and no better: what to check and what comes next before switching products.

When should you stop applying and see a doctor?

Applying a fissure cream should feel like mild stinging at most, easing within minutes. Stop and get checked without delay if you notice:

If the fissure is still open after 8 weeks of correct use, the next steps are a botulinum toxin injection or a lateral internal sphincterotomy, discussed with a colorectal surgeon. See our surgery page and the overview of fissure treatment.

Where does FISURIN fit?

FISURIN is the nifedipine and lidocaine cream in a water-based hydrogel that our surgeons at Clínica Proctológica de Lima prescribe, and it comes with the written 6-week protocol and the same technique described here, because we saw how often good creams failed through poor application. A randomized double-blind trial of the same combination (nifedipine 0.3 % with lidocaine 1.5 %) reported healing in 94.5 % of chronic fissures at 6 weeks versus 16.4 % in the control group (Perrotti, 2002); that is a study result, not a promise for every patient, and the cream does not replace soft stools. Today FISURIN is a magistral formula prepared under prescription in Peru and is not shipped abroad; FISURIN Hydrogel and FISURIN Relief are in preparation, with a waiting list. See what is inside FISURIN, the step-by-step instructions or how to get it where you live.