Diphenhydramine vs Trimethoprim

Diphenhydramine vs Trimethoprim: Overview

This comparison examines the pharmacological differences between Diphenhydramine and Trimethoprim.

Mechanism of Action

Diphenhydramine: First-generation H1 antihistamine with anticholinergic properties.

Trimethoprim: Dihydrofolate reductase inhibitor (bacterial selective).

Pharmacokinetics

Half-life: Diphenhydramine — 2-8 hours; Trimethoprim — 8-10 hours.

Chemical Properties

Molecular Formula: Diphenhydramine — C17H21NO; Trimethoprim — C14H18N4O3.

Molecular Weight: Diphenhydramine — 255.3550 g/mol; Trimethoprim — 290.3180 g/mol.

Type: Diphenhydramine — Small molecule; Trimethoprim — Small molecule.