Anal fissure ointment
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Here is a comprehensive guide to ointments and topical treatments used for anal fissures, drawn from multiple surgical and primary care textbooks.
Anal Fissure - Topical Ointment Treatments
Pathophysiology (Why Ointments Work)
An anal fissure triggers internal anal sphincter spasm, which reduces blood flow to the anal mucosa, creating ischemia that prevents healing - a vicious cycle. The goal of topical agents is "chemical sphincterotomy": relaxing the internal sphincter, improving anodermal blood flow, and allowing the fissure to heal. - Pfenninger & Fowler's Procedures for Primary Care, p. 690; Sabiston Textbook of Surgery, p. 2159
First-Line Conservative Measures
Before any ointment, all patients should begin:
- High-fiber diet (≥30 g/day) + fiber supplements (3-6 g/day)
- 6-8 glasses of water per day
- Sitz baths (provide significant pain relief in >90% of patients with acute fissures)
- Stool softeners/bulking agents
Most acute fissures resolve within 2-4 weeks with these measures alone. Chronic fissures (>6-8 weeks) are less likely to heal without topical pharmacotherapy. - Sabiston, p. 2158-2159; Roberts & Hedges' Emergency Medicine, p. 3535
Topical Ointments - Comparison Table
| Agent | Concentration | Dosing | Mechanism | Healing Rate | Key Side Effect |
|---|---|---|---|---|---|
| Glyceryl Trinitrate (GTN/Nitroglycerin) | 0.2%-0.5% | 3-4x/day for 6-8 weeks | Nitric oxide donor -> relaxes internal sphincter + vasodilation | ~50% of chronic fissures | Headache (up to 20% discontinue) |
| Nifedipine gel | 0.2% (often + lidocaine 1.5%) | 2-3x/day | Calcium channel blocker -> sphincter relaxation | Similar to GTN | Fewer headaches; preferred by many |
| Diltiazem ointment | 2% | 2x/day | Calcium channel blocker | Similar to GTN | Better tolerated than GTN; preferred first-line topical in many centers |
| Lidocaine ointment | 5% | Apply as needed (esp. before BM) | Topical anesthetic | Symptomatic relief only | Minimal |
| Hydrocortisone cream | Standard OTC | Short-term only | Anti-inflammatory | Limited evidence | Not for long-term use |
Drug Details
1. Nitroglycerin (GTN) Ointment
- Concentration: 0.2% (not commercially available as a premade product in many countries - must be compounded by pharmacy; do NOT use the 2% cardiac preparation)
- Prescription: "0.2% nitroglycerin ointment, 60 g - apply a small amount (size of a pencil eraser) to the anal fissure, 3-4 times daily for 6-8 weeks"
- Application: Apply directly to the fissure with a finger - not with a rectal tube applicator or suppository
- Headache management: If headache occurs, use a smaller amount; taking aspirin 1 hour beforehand can help
- Pfenninger & Fowler's, p. 690-691
2. Nifedipine Gel 0.2%
- Compounding formula: Mix 10 x 20 mg nifedipine capsules in 100 mL surgical lubricant (K-Y Jelly or 2% lidocaine jelly can substitute)
- With lidocaine: Nifedipine 0.2% + lidocaine 1.5% applied twice daily - reduces anal canal pressure and promotes healing
- Some add bethanechol to make a 0.1% mixture
- Preferred by many because it achieves similar healing rates to GTN with significantly fewer headaches
- Pfenninger & Fowler's, p. 691; Roberts & Hedges', p. 3537
3. Diltiazem Ointment 2%
- Similar healing efficacy to topical nitrates
- Better side-effect profile for headaches - making calcium channel blockers the preferred first-line topical agent per Sabiston
- Must be obtained from compounding pharmacies (no commercial formulation available in the US)
- Sabiston Textbook of Surgery, p. 2159
4. Lidocaine 5% Ointment
- Used for pain relief, not healing
- Especially useful before bowel movements and at bedtime
- Does not treat the underlying sphincter spasm
- Pfenninger & Fowler's, p. 690
Important Application Rules
- Always apply with a finger directly to the fissure - never with a rectal tube applicator
- No suppositories - these worsen anal fissure symptoms by dilating the canal
- No anal dilators - risk of unpredictable sphincter disruption and incontinence
- No silver nitrate or electrocautery - can exacerbate symptoms
- Over-the-counter creams (e.g., Anusol, Preparation H) provide minimal therapeutic benefit but can lubricate the canal for bowel movements
When Ointments Fail - Escalation
If topical therapy fails after 6-8 weeks:
- Botulinum toxin (Botox) injection into the internal sphincter - 20-100 IU; lasts ~3 months; effective but modest improvement over topicals; risk of temporary flatus incontinence
- Lateral Internal Sphincterotomy (LIS) - the gold standard surgical treatment; healing rates 88-100%; considered definitive therapy for chronic anal fissure - Sabiston, p. 2160
Recent meta-analyses (2024-2025) confirm botulinum toxin as effective for chronic anal fissure with favorable safety profiles (PMID: 39786616), though LIS remains superior for long-term cure (PMID: 39579232).
Summary of Preferred Approach
| Stage | Agent |
|---|---|
| Acute fissure | Fiber + sitz baths + lidocaine 5% for pain |
| Persistent / chronic fissure (first-line) | Diltiazem 2% or Nifedipine 0.2% gel (better tolerated) |
| Alternative first-line | GTN 0.2% ointment |
| Second-line | Botulinum toxin injection |
| Definitive surgical | Lateral internal sphincterotomy |
Note: Topical calcium channel blockers (diltiazem, nifedipine) are now preferred over GTN as first-line topical agents due to equivalent efficacy with a significantly better headache side-effect profile. - Sabiston Textbook of Surgery, p. 2159
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