What is drug of choice for ulcerative colitis –
**Core Concept**
Ulcerative colitis (UC) is a type of inflammatory bowel disease (IBD) characterized by chronic inflammation and ulceration of the colonic mucosa. The primary goal of treatment is to induce and maintain remission, manage symptoms, and prevent complications.
**Why the Correct Answer is Right**
The drug of choice for ulcerative colitis is aminosalicylates, specifically sulfasalazine (Azulfidine) or mesalamine (Asacol, Pentasa, Lialda). These medications work by releasing 5-aminosalicylic acid (5-ASA) in the colon, which has anti-inflammatory properties and reduces the production of pro-inflammatory cytokines. The 5-ASA moiety inhibits the activity of lipoxygenase enzymes, which are involved in the production of leukotrienes, potent inflammatory mediators.
**Why Each Wrong Option is Incorrect**
**Option A:** Corticosteroids are effective in inducing remission in UC but are not the first-line treatment due to potential side effects and the risk of dependency.
**Option B:** Immunomodulators, such as azathioprine or mercaptopurine, are used in moderate to severe UC but are not the initial choice due to their side effect profile and the need for monitoring.
**Option C:** Biologic agents, such as infliximab or adalimumab, are reserved for patients with moderate to severe UC who have failed conventional therapy or have an inadequate response to other treatments.
**Clinical Pearl / High-Yield Fact**
Aminosalicylates are effective in UC because they can be administered topically, reducing systemic absorption and minimizing side effects.
**Correct Answer: A. Sulfasalazine (Azulfidine) or mesalamine (Asacol, Pentasa, Lialda)**