**Question:** NSAID induced ulcer are treated by:

A. Proton pump inhibitors (PPIs)
B. H2 blockers
C. Antacids
D. Mesalamine

**Core Concept:**
NSAIDs (Non-steroidal anti-inflammatory drugs) are a class of medications used for pain relief, inflammation, and fever reduction. However, they can cause a decrease in gastric mucus production, reduced gag reflex, and impaired wound healing, leading to an increased risk for gastric ulcers. These ulcers can be managed effectively with medications that inhibit acid production or protect the gastric mucosa.

**Why the Correct Answer is Right:**
NSAID-induced ulcers are treated by using medications that either inhibit gastric acid secretion (acid-suppressive agents) or protect the gastric mucosa. In this case, the correct answer is A: Proton pump inhibitors (PPIs) are the first-line drugs for the treatment of NSAID-induced ulcers. PPIs work by irreversibly blocking the enzyme H+/K+-ATPase in the gastric parietal cells, leading to a significant reduction in gastric acid secretion. This results in better healing of NSAID-induced gastric ulcers compared to H2 blockers (B) or antacids (C).

**Why Each Wrong Option is Incorrect:**
B. H2 blockers (e.g., cimetidine, ranitidine) are also acid suppressants but work by competitive inhibition of histamine at H2 receptors, leading to a partial reduction in gastric acid secretion. This is less effective than PPIs for NSAID-induced ulcer healing, making option B incorrect.

C. Antacids neutralize gastric acid, reducing its pH and potentially mitigating NSAID-induced ulcer damage. However, antacids have a limited effect on acid production and do not provide the same level of acid suppression as PPIs or H2 blockers. Therefore, option C is incorrect.

D. Mesalamine is a medication used for ulcerative colitis and Crohn's disease treatment, not specifically for NSAID-induced ulcer management. Hence, option D is incorrect.

**Clinical Pearl:**
In clinical practice, when treating patients with NSAID-induced ulcers, it is essential to select the most effective medication for acid suppression (PPIs) to ensure an optimal healing rate and minimize the risk of complications like gastrointestinal bleeding. Using alternative medications like H2 blockers, antacids, or mesalamine can lead to suboptimal outcomes compared to PPIs.