Erlotinib vs Trimethoprim

## Erlotinib vs Trimethoprim: Overview

This comparison examines the pharmacological differences between **Erlotinib** and **Trimethoprim**.

## Mechanism of Action

**Erlotinib**: Reversible inhibitor of EGFR (HER1) tyrosine kinase, blocking autophosphorylation.

**Trimethoprim**: Dihydrofolate reductase inhibitor (bacterial selective).

## Pharmacokinetics

**Half-life**: Erlotinib — 36 hours; Trimethoprim — 8-10 hours.

## Chemical Properties

**Molecular Formula**: Erlotinib — C22H23N3O4; Trimethoprim — C14H18N4O3.

**Molecular Weight**: Erlotinib — 393.4380 g/mol; Trimethoprim — 290.3180 g/mol.

**Type**: Erlotinib — Small molecule; Trimethoprim — Small molecule.