Cephalexin vs Diphenhydramine

## Cephalexin vs Diphenhydramine: Overview

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

## Mechanism of Action

**Cephalexin**: First-generation cephalosporin inhibiting cell wall synthesis.

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

## Pharmacokinetics

**Half-life**: Cephalexin — 0.5-1.2 hours; Diphenhydramine — 2-8 hours.

## Chemical Properties

**Molecular Formula**: Cephalexin — C16H17N3O4S; Diphenhydramine — C17H21NO.

**Molecular Weight**: Cephalexin — 347.3890 g/mol; Diphenhydramine — 255.3550 g/mol.

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