What is drug of choice for ulcerative colitis :
The first-line treatment I remember is aminosalicylates, like mesalamine. They work by reducing inflammation in the colon. If that's not enough, corticosteroids might be used for acute flare-ups. Then there's immunomodulators like azathioprine or biologics such as TNF inhibitors for more severe cases. But the question is asking for the drug of choice, which is typically the first-line option.
Wait, the options aren't listed here. The user provided the question with placeholders for options A to D. The correct answer is supposed to be one of these, but the actual answer text isn't given. Hmm. Since the correct answer is missing, maybe I should infer based on standard knowledge. Mesalamine is the standard first-line drug for mild to moderate ulcerative colitis. So if one of the options is mesalamine, that's the correct answer. The other options might be other drugs like corticosteroids, biologics, or even something else.
I need to make sure the explanation is accurate. The core concept here is the pharmacological management of ulcerative colitis. The correct answer would be aminosalicylates, specifically mesalamine. The wrong options might include corticosteroids, which are used for acute flare-ups but not as maintenance therapy. Biologics are for moderate to severe cases when first-line treatments fail. Other options could be antibiotics or antispasmodics, which aren't primary treatments.
So, the explanation should state that mesalamine is the drug of choice. Then explain why other options are incorrect. The clinical pearl would be to remember that aminosalicylates are first-line, and corticosteroids are for flares. The correct answer line should list the correct option letter and the drug name.
**Core Concept**: Ulcerative colitis is managed with anti-inflammatory drugs targeting the colon. **Aminosalicylates** (e.g., mesalamine) are first-line for mild-to-moderate disease due to their localized anti-inflammatory effects without systemic immunosuppression.
**Why the Correct Answer is Right**: Mesalamine is the drug of choice for inducing and maintaining remission in ulcerative colitis. It acts by inhibiting cyclooxygenase and lipoxygenase pathways, reducing prostaglandin and leukotriene synthesis, thereby decreasing mucosal inflammation. It is delivered rectally or orally, with minimal systemic absorption, making it safer for long-term use compared to corticosteroids.
**Why Each Wrong Option is Incorrect**:
**Option A:** Corticosteroids (e.g., prednisone) are reserved for acute flares but not maintenance therapy due to significant side effects.
**Option B:** Biologics (e.g., infliximab) are second-line for moderate-to-severe cases unresponsive to aminosalicylates.
**Option C:** Azathioprine is an immunomodulator used for steroid-dependent patients, not first-line.
**Clinical Pearl / High-Yield Fact**: Remember the hierarchy: **Aminosalicylates →