Methotrexate vs Pembrolizumab

## Methotrexate vs Pembrolizumab: Overview

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

## Mechanism of Action

**Methotrexate**: Dihydrofolate reductase inhibitor.

**Pembrolizumab**: Anti-PD-1 monoclonal antibody restoring anti-tumor immunity.

## Pharmacokinetics

**Half-life**: Methotrexate — 3-10 hours; Pembrolizumab — 26 days.

## Chemical Properties

**Molecular Formula**: Methotrexate — C20H22N8O5; Pembrolizumab — N/A.

**Molecular Weight**: Methotrexate — 454.4400 g/mol; Pembrolizumab — N/A.

**Type**: Methotrexate — Small molecule; Pembrolizumab — Antibody.