Medications That Can Worsen Ulcerative Colitis: 5 to Know

Ulcerative colitis is a chronic inflammatory bowel disease that can be aggravated by certain everyday medications. Knowing which drugs might trigger flares or, in some cases, be linked to the onset of the disease can help you and your care team make safer choices.

What is ulcerative colitis?

Ulcerative colitis (UC) causes ongoing inflammation and ulcers in the lining of the colon and rectum. Symptoms often include bloody diarrhea, urgent bowel movements, abdominal cramping, fatigue, and weight loss. The disease typically follows a relapsing–remitting pattern, with periods of flares and remission.

While there isn’t a single known cause, UC likely results from a mix of genetics, an overactive immune response, environmental exposures, and changes in the gut microbiome. Family history increases risk, and certain environmental factors—like infections, diet patterns, and smoking status—can influence disease activity. (Interestingly, current smoking appears protective for UC, but it carries serious health risks and is not a treatment.)

Diagnosis is based on symptoms, lab tests, stool studies, imaging, and most definitively, colonoscopy with biopsies. Early diagnosis and tailored therapy are key to protecting the colon, preventing complications, and maintaining quality of life.

5 medications that can worsen or trigger UC

Not everyone will react the same way to each drug, but the following medication classes have been linked to flares or a higher chance of developing inflammatory bowel disease in some people. Never stop a prescription without discussing it with your clinician; instead, ask about safer alternatives.

1) Nonsteroidal anti-inflammatory drugs (NSAIDs)

Examples: ibuprofen, naproxen, diclofenac.

Why they matter: NSAIDs can irritate the GI lining and increase intestinal permeability, potentially triggering UC flares. Many people with UC report worsening symptoms after using them for headaches, period cramps, or joint pain.

What to consider instead: Acetaminophen (paracetamol) is often preferred for pain and fever. If an anti-inflammatory is unavoidable, ask about the risks and benefits of a COX-2 selective option (e.g., celecoxib) and whether it’s appropriate for you.

2) Broad-spectrum antibiotics

Examples: amoxicillin-clavulanate, fluoroquinolones, clindamycin.

Why they matter: Repeated or broad-spectrum antibiotic use can disrupt the gut microbiome, which may increase the risk of IBD onset in susceptible individuals and can provoke flares in those with UC.

What to consider instead: Use antibiotics only when clearly needed, with the narrowest effective spectrum and shortest effective duration. Discuss preventive strategies (probiotics, timing with meals) with your clinician.

3) Isotretinoin (Accutane)

Why it matters: Some observational studies have linked isotretinoin exposure to the development or exacerbation of inflammatory bowel disease. While evidence is mixed and not definitively causal, caution is reasonable if you have a personal or strong family history of UC.

What to consider instead: For severe acne, dermatologists may consider alternative regimens or monitor closely for gastrointestinal symptoms. Report any persistent abdominal pain, diarrhea, or rectal bleeding right away.

4) Oral contraceptive pills (OCPs)

Why they matter: Several large cohort studies have found an association between OCP use and an increased risk of developing IBD, including UC. The effect appears modest and is not proof of causation, but it’s worth discussing if you’re at elevated risk.

What to consider instead: Non-estrogen options (e.g., copper or levonorgestrel IUDs, progestin-only methods) may be alternatives. Your gynecologist can help balance contraceptive needs with IBD risk and symptom control.

5) Proton pump inhibitors (PPIs)

Examples: omeprazole, esomeprazole, pantoprazole.

Why they matter: PPIs can alter stomach acidity and downstream microbiome composition. Observational research has associated PPI use with increased IBD activity in some patients.

What to consider instead: For reflux, lifestyle measures (weight management, elevating the head of the bed, avoiding late meals, limiting alcohol and trigger foods) and, when suitable, step-down therapy or H2 blockers may help. Never change acid-suppressing therapy without medical advice, especially if you have ulcers, Barrett’s esophagus, or severe GERD.

How UC is treated

Care is personalized to disease severity, location, and your goals. The main aims are to stop a flare, achieve mucosal healing, prevent relapse, and improve quality of life.

5-ASA (mesalamine) therapies: Oral and/or rectal formulations reduce inflammation, particularly effective for mild to moderate disease and for maintaining remission.
Corticosteroids: Short courses (oral, rectal, or IV) quickly quell flares but aren’t for long-term maintenance due to side effects.
Immunomodulators: Azathioprine, 6-mercaptopurine, and methotrexate can maintain remission in some patients, often as steroid-sparing agents.
Biologics and small molecules: Anti-TNF agents (infliximab, adalimumab), anti-integrin (vedolizumab), anti–IL-12/23 (ustekinumab), and JAK inhibitors (tofacitinib, upadacitinib) target specific immune pathways and are effective for moderate to severe UC.
Surgery: For refractory disease, severe complications, or dysplasia/cancer, colectomy with ileal pouch–anal anastomosis (IPAA) or end ileostomy can be curative for colitis symptoms.

Supportive care matters too: vaccinations, bone and skin health, mental well-being, and regular colon cancer surveillance when indicated. Work with a gastroenterologist and an IBD-experienced dietitian for a comprehensive plan.

Foods to avoid with ulcerative colitis (and better choices)

Food doesn’t cause UC, but it can strongly influence symptoms. During a flare, the inflamed colon is extra sensitive; choosing gentler foods can reduce pain, urgency, and diarrhea. In remission, a broader, balanced diet is usually possible. Keep a food-and-symptom journal to discover your personal triggers.

Common foods to limit or avoid (especially during flares)

Insoluble fiber–dense foods: raw leafy greens, crunchy salads, raw broccoli/cauliflower, bran cereals, popcorn, nuts, and seeds.
Greasy or very high-fat foods: deep-fried items, heavy takeout, fatty cuts of meat; these can increase urgency and cramping.
Spicy foods and strong seasonings: hot peppers, chili oil, wasabi.
Alcohol and caffeine: beer, wine, spirits, energy drinks, strong coffee—can stimulate the bowel.
Sugar alcohols and high–added sugar foods: sorbitol, mannitol, xylitol in “sugar-free” candies/gums; large servings of sweets may worsen bloating and diarrhea.
Lactose-containing dairy (if sensitive): milk, soft cheeses, ice cream; consider lactase-treated or lactose-free options.
Carbonated beverages: can increase gas and discomfort.

Gentler swaps and strategies

Low-residue choices during flares: white rice, sourdough or white bread, plain pasta, peeled and cooked vegetables (carrots, zucchini), ripe bananas, applesauce, smooth nut butters (if tolerated), lean poultry or fish.
Protein first: eggs, tofu, baked chicken or turkey, simple fish preparations can help maintain strength without excessive fiber.
Cook it soft: steaming, baking, or slow-cooking can make foods easier to digest than raw or fried preparations.
Hydrate smartly: water, oral rehydration solutions, and broths; limit alcohol and very sweet drinks.
Reintroduce gradually in remission: add back whole grains, fruits, and veggies in small amounts; peel and cook at first, and space high-fiber foods throughout the day.

Because triggers vary, some people benefit from structured approaches such as a short-term low-FODMAP plan or an individualized Mediterranean-style diet in remission. Work with a dietitian to avoid nutrient gaps, especially if you’ve lost weight or have iron, B12, or vitamin D deficiencies.

Practical next steps

Review your medicine cabinet: Check for NSAIDs, PPIs, and other drugs listed above. Ask your clinician about safer alternatives if you have UC or significant risk factors.
Don’t stop prescriptions abruptly: Sudden changes can be harmful. Make adjustments under medical supervision.
Build your care team: A gastroenterologist, primary care clinician, and IBD dietitian can tailor your treatment and nutrition plan.
Track patterns: Keep a simple log of symptoms, foods, stress, sleep, and medications to spot triggers and share insights at appointments.

If you suspect a medication is worsening your ulcerative colitis—or you’re starting a new one and want to minimize risk—bring this list to your next visit and discuss the best plan for you.