Cephalexin vs Doxycycline

## Cephalexin vs Doxycycline: Overview

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

## Mechanism of Action

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

**Doxycycline**: Inhibits bacterial protein synthesis by binding 30S ribosomal subunit.

## Pharmacokinetics

**Half-life**: Cephalexin — 0.5-1.2 hours; Doxycycline — 18-22 hours.

## Chemical Properties

**Molecular Formula**: Cephalexin — C16H17N3O4S; Doxycycline — C22H24N2O8.

**Molecular Weight**: Cephalexin — 347.3890 g/mol; Doxycycline — 444.4350 g/mol.

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