Diphenhydramine vs Methotrexate

## Diphenhydramine vs Methotrexate: Overview

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

## Mechanism of Action

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

**Methotrexate**: Dihydrofolate reductase inhibitor.

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Methotrexate — 3-10 hours.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Methotrexate — C20H22N8O5.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Methotrexate — 454.4400 g/mol.

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