Diphenhydramine vs Rabeprazole

## Diphenhydramine vs Rabeprazole: Overview

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

## Mechanism of Action

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

**Rabeprazole**: Proton pump inhibitor irreversibly inhibiting gastric H+/K+-ATPase with faster onset than omeprazole.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Rabeprazole — 1-2 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Rabeprazole — C18H21N3O3S.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Rabeprazole — 359.4440 g/mol.

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