Diphenhydramine vs Phenytoin
Diphenhydramine vs Phenytoin: Overview
This comparison examines the pharmacological differences between Diphenhydramine and Phenytoin.
Mechanism of Action
Diphenhydramine: First-generation H1 antihistamine with anticholinergic properties.
Phenytoin: Sodium channel blocker stabilizing inactive state.
Pharmacokinetics
Half-life: Diphenhydramine — 2-8 hours; Phenytoin — 22 hours.
Chemical Properties
Molecular Formula: Diphenhydramine — C17H21NO; Phenytoin — C15H12N2O2.
Molecular Weight: Diphenhydramine — 255.3550 g/mol; Phenytoin — 252.2680 g/mol.
Type: Diphenhydramine — Small molecule; Phenytoin — Small molecule.