Diphenhydramine vs Tamoxifen

## Diphenhydramine vs Tamoxifen: Overview

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

## Mechanism of Action

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

**Tamoxifen**: Selective estrogen receptor modulator (SERM).

## Pharmacokinetics

**Half-life**: Diphenhydramine — 2-8 hours; Tamoxifen — 5-7 days.

## Chemical Properties

**Molecular Formula**: Diphenhydramine — C17H21NO; Tamoxifen — C26H29NO.

**Molecular Weight**: Diphenhydramine — 255.3550 g/mol; Tamoxifen — 371.5150 g/mol.

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