What over‑the‑counter options can be used to treat colitis symptoms?

Over-the-Counter Treatment for Colitis

For microscopic colitis, bismuth subsalicylate (Pepto-Bismol) is the only evidence-based over-the-counter option, requiring 8-9 tablets daily divided three times per day, though it is conditionally recommended only as second-line therapy when prescription budesonide is not feasible. 1

Critical Context: Type of Colitis Matters

The term "colitis" encompasses multiple distinct conditions requiring different treatments. True over-the-counter options are extremely limited and only apply to microscopic colitis (collagenous and lymphocytic colitis). For ulcerative colitis and Crohn's disease, prescription medications are necessary.

For Microscopic Colitis

First-Line Approach (Requires Prescription)

Budesonide 9 mg daily is the gold standard, achieving clinical remission in over twice as many patients compared to no treatment (RR 2.52), with a number needed to treat of only 2 patients. 1 However, this requires a prescription.

Over-the-Counter Option: Bismuth Subsalicylate

Dosing regimen: 8-9 tablets (approximately 2,300 mg) divided three times daily for 8 weeks 1

Evidence quality: One small randomized trial showed all 7 patients on bismuth subsalicylate achieved clinical response versus 0 of 7 on placebo (p=0.003), with 3-fold higher likelihood of histological response. 1, 2, 3

Important caveats:

• The AGA gives this only a conditional recommendation with low-quality evidence 1
• Significant pill burden (8-9 tablets daily) in typically older patients already on multiple medications
• Unknown risk of salicylate or bismuth toxicity with long-term use
• Should only be considered when budesonide is not feasible due to cost or contraindications

Non-Pharmacologic OTC Measures

• Discontinue NSAIDs immediately if currently taking them 4
• Trial elimination of caffeine and lactose (no direct evidence, but reasonable to attempt) 4
• Loperamide or diphenoxylate for symptomatic diarrhea control, though these appear largely ineffective in microscopic colitis 4

For Ulcerative Colitis and Crohn's Disease

There are NO effective over-the-counter treatments for ulcerative colitis or Crohn's disease. These conditions require prescription medications:

• Ulcerative colitis: Requires prescription mesalamine (5-ASA) compounds, topical mesalamine, or corticosteroids 5, 6
• Crohn's disease: Requires prescription mesalamine, budesonide, or corticosteroids 7

What Does NOT Work (Despite Being OTC)

• Probiotics: The AGA specifically recommends AGAINST probiotics for microscopic colitis (conditional recommendation, low-quality evidence) 1
• Boswellia serrata: The AGA recommends AGAINST this herbal supplement (conditional recommendation, low-quality evidence) 1

Common Pitfalls to Avoid

1. Self-diagnosing "colitis" without proper evaluation - requires colonoscopy with biopsies to distinguish microscopic colitis from IBD
2. Delaying prescription therapy while trying ineffective OTC options - this risks disease progression and complications
3. Assuming IBS treatments work for colitis - loperamide and antispasmodics that work for IBS are ineffective for inflammatory colitis 4
4. Taking excessive bismuth subsalicylate without medical supervision - toxicity risk is unknown

Bottom Line Algorithm

If you have confirmed microscopic colitis:

• First choice: Get prescription budesonide 9 mg daily
• If budesonide not feasible: Bismuth subsalicylate 8-9 tablets daily in 3 divided doses
• Stop NSAIDs, eliminate caffeine/lactose
• Loperamide may help symptoms but won't treat disease

If you have ulcerative colitis or Crohn's disease:

• No OTC options are effective
• Requires prescription 5-ASA compounds, corticosteroids, or advanced therapies
• Do not delay seeking prescription treatment

If you don't know what type of colitis you have:

• See a gastroenterologist for colonoscopy with biopsies
• Do not attempt self-treatment without diagnosis