Diphenhydramine vs Upadacitinib

## Diphenhydramine vs Upadacitinib: Overview

This comparison examines the pharmacological differences between **Diphenhydramine** and **Upadacitinib**.

## Mechanism of Action

**Diphenhydramine**: First-generation H1 antihistamine with anticholinergic properties.

**Upadacitinib**: Selective JAK1 inhibitor reducing signaling from cytokines implicated in autoimmune diseases.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Upadacitinib — 9-14 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Upadacitinib — C17H19F3N6O.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Upadacitinib — 380.3700 g/mol.

**Type**: Diphenhydramine — Small molecule; Upadacitinib — Small molecule.