Nifedipine is a blood pressure drug, but as an ointment for anal fissures it works on a muscle rather than on your blood pressure. It relaxes the tight ring of muscle that keeps a fissure from closing, so it treats the reason the tear stays open instead of only numbing the pain. Many chronic fissures that had lasted for months heal within a couple of months of using it.1PubMed. Topical nifedipine with lidocaine ointment vs. active control for treatment of chronic anal fissure: results of a prospective, randomized, double-blind study
Why Fissures Don’t Heal on Their Own
A fissure usually starts as a small tear in the anal lining, caused by hard stool or straining. The tear hurts, and pain makes the internal sphincter, an inner ring muscle you can’t consciously control, clamp tighter.2PubMed. Increased anal basal pressure in chronic anal fissures may be caused by overreaction of the anal-external sphincter continence reflex That higher squeezing pressure reduces blood flow to the skin lining the anus, so the tear gets too little blood to heal and can become chronic.3PubMed. Increased anal basal pressure in chronic anal fissures may be caused by overreaction of the anal-external sphincter continence reflex Every bowel movement also stretches the tear open again before new tissue can seal it.
Fear of the next trip to the toilet leads people to hold stool in, which lets it harden. Harder stool re-tears the lining, and the cycle starts again. That’s why a fissure that lasts more than about six weeks often needs treatment aimed at the muscle.
The back of the anal canal is the weak spot. The back midline already gets less blood than the other areas, and the higher the sphincter pressure there, the lower the blood flow.4PubMed. Relationship between anal pressure and anodermal blood flow. The vascular pathogenesis of anal fissures Most chronic fissures sit at the back. When sphincter pressure is lowered, blood flow at the back midline improves and fissures can heal.5PubMed. Ischaemic nature of anal fissure
Acute fissures are recent and often heal with fibre, fluids and warm baths. Chronic fissures last over six to eight weeks and may have a skin tag or exposed muscle fibres. Nifedipine is mainly prescribed for chronic fissures, though it is sometimes used for acute ones.
A persistent fissure typically causes a little bright red blood on the paper or in the toilet, usually not mixed through the stool. Over time the edges of a long-standing tear can thicken into a small skin tag at the outer end, which people sometimes mistake for a hemorrhoid. Because hemorrhoids and other conditions can cause similar bleeding, a clinician should confirm the diagnosis.
How Nifedipine Relaxes the Sphincter
The inner ring muscle stays partly contracted all the time, and calcium entering its muscle cells powers that tone.6PubMed Central. Oscillating calcium signals in smooth muscle cells underlie the persistent basal tone of internal anal sphincter Nifedipine is a calcium channel blocker, so it shuts the channels that let calcium in.7PubMed Central. Oscillating calcium signals in smooth muscle cells underlie the persistent basal tone of internal anal sphincter That largely stops the muscle’s rhythmic squeezing and weakens its steady contraction.8PubMed Central. Oscillating calcium signals in smooth muscle cells underlie the persistent basal tone of internal anal sphincter It also relaxes the muscle in small blood vessels, so they widen and bring more blood to the tear.9Acta Gastro-Enterologica Belgica. Belgian consensus guideline on the management of anal fissures
The pressure drop is measurable. Nifedipine lowered resting anal pressure by about 30 percent in people with and without fissures.10PubMed. Effect of nifedipine on rectoanal motility The effect resembles a temporary, reversible version of what surgery does by cutting the muscle. Even so, the muscle can still contract when you need it to hold in stool or gas.11PubMed. Effects of nifedipine on anorectal smooth muscle in vitro
The inner ring muscle lies just beneath the thin lining of the anal canal, so an ointment applied just inside the opening can soak into it directly. That is also why it comes as an ointment rather than pills: much less reaches the bloodstream, so there are fewer effects on the rest of the body. In reviews, ointment worked better and caused fewer side effects than pills.12PubMed Central. Efficacy and safety of topical vs. oral calcium channel blockers for chronic anal fissures: a systematic review and meta-analysis Oral nifedipine for fissures caused headache in roughly 38 to 39 percent of users, compared with 16 percent for ointments.13Acta Gastro-Enterologica Belgica. Belgian consensus guideline on the management of anal fissures
The relaxation is temporary. The effect wears off between doses, which is why the ointment is applied two or three times a day. Stopping early can let the spasm return before the tear has closed. Once you stop, the muscle goes back to its usual tone with no lasting change.
How Well It Works and How Long It Takes
With nifedipine plus lidocaine ointment, about 95 percent of chronic fissures healed in 6 weeks, compared with about 16 percent without it.14PubMed. Topical nifedipine with lidocaine ointment vs. active control for treatment of chronic anal fissure: results of a prospective, randomized, double-blind study Other trials of nifedipine alone found healing rates of about 70 to 83 percent at 6 weeks,15PubMed. A Double-Blind Randomised Controlled Trial Comparing the Efficacy of Nifedipine and Diltiazem Ointments in the Treatment of Anal Fissure and about 73 percent healed in another 6-week trial.16Pakistan Railway Hospital / WHO EMRO. Comparison of Topical Glyceryl Trinitrate and Nifedipine in Management of Chronic Anal Fissure Six to 8 weeks is the usual course to judge whether it is working.
Improvement tends to come in stages. Pain after bowel movements often eases first, within days to a couple of weeks, and bleeding on the toilet paper usually fades next. Full closure of the tear takes longer, so keep using the ointment for the whole prescribed course. In one trial, pain at day 21 was very low on nifedipine.17PubMed Central. A Double-Blind Randomized Trial Comparing the Effectiveness and Safety of Nifedipine and Isosorbide Dinitrate in Chronic Anal Fissure
Not everyone heals, and fissures can return. In one series only about half of patients healed with nifedipine, and the rest went on to surgery.18International Journal of Surgery Science. Effect of topical nifedipine in treatment of chronic anal fissure Even when the fissure heals, it often comes back.19International Journal of Surgery Science. Effect of topical nifedipine in treatment of chronic anal fissure A Belgian expert guideline also notes that pooled trials of nifedipine 0.3 to 0.5 percent did not clearly beat a dummy ointment.20Acta Gastro-Enterologica Belgica. Belgian consensus guideline on the management of anal fissures
Trials differ in ointment strength, how long people were treated, whether lidocaine was included and how healing was defined, so the percentages can’t be compared directly. The very high figures often come from smaller trials, and a small trial can overstate a benefit that larger pooled analyses don’t confirm.
Supportive habits help too: soft stools from fibre and water so the tear doesn’t re-open, warm sitz baths to relax the sphincter further, and no straining or sitting long on the toilet. They also lower the chance of the fissure coming back after it heals.
Side Effects and How It Compares With Other Ointments
GTN (glyceryl trinitrate) is a nitroglycerin ointment, the other common first treatment, and it often causes headaches.21PubMed. Topical nifedipine vs. topical glyceryl trinitrate for treatment of chronic anal fissure Nifedipine caused fewer side effects than GTN and worked better in one trial.22PubMed. Topical nifedipine vs. topical glyceryl trinitrate for treatment of chronic anal fissure In another trial, headache affected about 17 percent of people using GTN and 7 percent of those using nifedipine, and nifedipine healed 83 percent compared with 60 percent.23Journal of Nepal Medical Association. Effectiveness of 0.2% Glyceryl Trinitrate and 0.5% Nifedipine in the Treatment of Chronic Anal Fissure In some trials, though, the two healed fissures about equally well.24Pakistan Railway Hospital / WHO EMRO. Comparison of Topical Glyceryl Trinitrate and Nifedipine in Management of Chronic Anal Fissure
Other side effects are uncommon. Only a few percent of users report mild headache in some series.25International Journal of Surgery Science. Effect of topical nifedipine in treatment of chronic anal fissure Low blood pressure was rare, and skin irritation was more common with diltiazem than with nifedipine.26PubMed Central. Comparative Study to Assess the Effectiveness of Topical Nifedipine and Diltiazem in the Treatment of Chronic Anal Fissure Diltiazem, a similar calcium blocker, healed about the same share of fissures as nifedipine.27PubMed. A Double-Blind Randomised Controlled Trial Comparing the Efficacy of Nifedipine and Diltiazem Ointments in the Treatment of Anal Fissure
A headache happens because a small amount of the drug is absorbed into the bloodstream, and like other drugs of its type it can widen blood vessels in the head. Nitroglycerin ointment widens them more strongly, which is why headaches are more common with it. Using only the amount prescribed keeps the absorbed dose low.
Headaches tend to appear soon after applying and often lessen after the first week. A simple painkiller can help; in one trial, people with severe headache continued treatment with painkillers.28Pakistan Railway Hospital / WHO EMRO. Comparison of Topical Glyceryl Trinitrate and Nifedipine in Management of Chronic Anal Fissure Stand up slowly if you feel dizzy. If headaches stop you using the ointment, tell your doctor, because switching ointments is an option.
To apply it, wash your hands and put a pea-sized amount just inside the anal opening with a fingertip or glove. Use it at the times your prescriber gives you, usually two or three times a day. Wash your hands afterwards so you don’t get it in your eyes.
A reaction that is more than mild, such as a spreading rash or swelling, is a reason to stop and contact your prescriber. If lidocaine is included, a numb feeling right after application is expected.
Nifedipine Versus Surgery
Lateral internal sphincterotomy is surgery that cuts part of the inner muscle to lower pressure for good. In one long-term study, about 97 percent healed with nifedipine and 100 percent with surgery by 8 weeks.29PubMed. Topical 0.5% nifedipine vs. lateral internal sphincterotomy for the treatment of chronic anal fissure: long-term follow-up Another trial found about 69 percent healed with nifedipine compared with 88 percent after surgery.30PubMed. Conservative versus surgical treatment for chronic anal idiopathic fissure: a prospective randomized trial
Surgery tends to come out ahead on how many fissures heal, but the gap varies between trials. That’s why the decision usually rests on risk and preference as well as on healing percentages.
The trade-off is continence. In one trial no one on nifedipine had leakage, while 30 percent had temporary and about 3 percent had permanent incontinence after surgery.31International Journal of Medical and Pharmaceutical Research. A Comparative Study of 0.3% Nifedipine and Lateral Anal Sphincterotomy in Anal Fissure Incontinence here covers a range, from difficulty holding gas or minor staining to loss of stool. Most problems were temporary, but the lasting ones are what make people cautious. Ointment avoids this risk because its effect wears off.
Some surgeons argue the fear of leakage is overstated and shouldn’t stop severe cases from getting relief.32PubMed. Conservative versus surgical treatment for chronic anal idiopathic fissure: a prospective randomized trial Still, ointment first, with surgery if it fails, is the usual path.
It’s worth bringing up surgery or other options if the fissure hasn’t healed after a full 6 to 8 week course, or if pain keeps returning after each course. Botox injection into the sphincter is a middle option, sometimes combined with ointment.33Acta Gastro-Enterologica Belgica. Evaluation of Surgical and Conservative Approaches in the Treatment of Anal Fissure: A Systematic Review Ask what the leakage risk is for you, since prior childbirth injury or older age can raise it.
Why Nifedipine Is Often Mixed With Lidocaine
Lidocaine is a local anaesthetic that numbs the area within minutes.34National Institute for Health and Care Research Innovation Observatory. Nifedipine–lidocaine for treating chronic anal fissure It eases pain right away while nifedipine relaxes the muscle over the following weeks.35PubMed Central. Effectiveness and Safety of Lidocaine-Nifedipine Combination in Patients With Acute and Chronic Anal Fissure: A Retrospective, Multi-centric, Post-marketing Surveillance Study Users of the combination reported less pain and bleeding and tolerated it well,36PubMed Central. Effectiveness and Safety of Lidocaine-Nifedipine Combination in Patients With Acute and Chronic Anal Fissure: A Retrospective, Multi-centric, Post-marketing Surveillance Study and combination treatments generally performed better than single drugs.37Acta Gastro-Enterologica Belgica. Evaluation of Surgical and Conservative Approaches in the Treatment of Anal Fissure: A Systematic Review
The numbing helps healing, not only comfort. Pain makes the muscle clench and makes people avoid the toilet, which hardens stool. A cream that lets you pass stool without dread supports softer, easier bowel movements, so pain relief complements the muscle relaxation rather than simply masking symptoms.
The combination is also used for children’s fissures. In one study of children with recent fissures, about 93 percent improved over 4 weeks on 0.3 percent nifedipine with lidocaine, without side effects.38PubMed Central. The Italian Unitary Society of Colon-proctology SIUCP Società Italiana Unitaria di Colonproctologia guidelines for the management of anal fissure Children usually get a lower strength, such as 0.2 percent.39PubMed. Anal fissure in children: a 10-year clinical experience with nifedipine gel with lidocaine Only use it on a child with a doctor’s prescription.
Compounded Ointment and Storage
In many countries nifedipine ointment is mixed by a pharmacy rather than sold ready-made. Compounded cream and ointment kept their strength for 90 days in plastic jars at room temperature.40International Journal of Pharmaceutical Compounding. Stability of Compounded Topical Nifedipine in Cream, Gel, and Ointment Bases Gel versions are best used within 60 days.41International Journal of Pharmaceutical Compounding. Stability of Compounded Topical Nifedipine in Cream, Gel, and Ointment Bases
Compounding means the pharmacist mixes the active drug into a base, such as an ointment or gel, so the product is made for you rather than manufactured in bulk. The prescription specifies the strength and base, and the pharmacist assigns a date after which it should not be used. If you move pharmacies, the product may be mixed slightly differently, so ask about any change.
Store it at normal room temperature, not in a hot car or a steamy bathroom. Check the beyond-use date on the pharmacy label, and throw the ointment out if it changes colour, texture or smell. After that date the drug may be weaker even if it looks unchanged. Strengths of 0.2 to 0.5 percent are common, so check that your label matches your prescription. If a course will run longer than the beyond-use date allows, ask for a fresh batch.