How do omeprazole and lansoprazole act as antacids ?

Explanation

### Step-by-Step Solution:

1. **Understanding Antacids**: Antacids are substances that neutralize stomach acid. They help relieve symptoms of heartburn, indigestion, and upset stomach by reducing acidity in the stomach.

**Hint**: Remember that antacids work primarily by neutralizing excess stomach acid.

2. **Mechanism of Action**: Omeprazole and lansoprazole are classified as proton pump inhibitors (PPIs). They do not act like traditional antacids that simply neutralize acid; instead, they inhibit the production of stomach acid.

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