Both antiacids and antiallergic drugs are antihistamines but they are antihistamines but they cannot replace each other . Explain why ?

Explanation

**Step-by-Step Solution:**

1. **Define Antacids and Antiallergic Drugs:**
- Antacids are medications that neutralize stomach acidity. They are used to relieve symptoms of heartburn, indigestion, and upset stomach.
- Antiallergic drugs, commonly known as antihistamines, are used to treat allergic reactions by blocking the action of histamine, a substance in the body that causes allergic symptoms.

2. **Understanding Antihistamines:**
- Antihistamines are a class of drugs that reduce or block the effects of histamine in the body. Histamine is released during allergic reactions and can cause symptoms such as itching, swelling, and redness.
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