**Quick Reference – Common Antihistamines**

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### 1. General Overview
- **Purpose:** Block H₁‑receptor → ↓ itching, hives, nasal congestion, sneezing, watery
eyes.
- **Typical dosing (adult):** 1–2 mg/kg IV or
25–50 mg PO every 4–6 h; repeat as needed.
- **Key points:** Short‑acting agents are preferred for
acute reactions; monitor for hypotension in severe cases.

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