Phenytoin vs Tacrolimus

## Phenytoin vs Tacrolimus: Overview

This comparison examines the pharmacological differences between **Phenytoin** and **Tacrolimus**.

## Mechanism of Action

**Phenytoin**: Sodium channel blocker stabilizing inactive state.

**Tacrolimus**: Calcineurin inhibitor binding FKBP12; suppresses IL-2 transcription.

## Pharmacokinetics

**Half-life**: Phenytoin — 22 hours; Tacrolimus — 12 hours.

## Chemical Properties

**Molecular Formula**: Phenytoin — C15H12N2O2; Tacrolimus — C44H69NO12.

**Molecular Weight**: Phenytoin — 252.2680 g/mol; Tacrolimus — 804.0180 g/mol.

**Type**: Phenytoin — Small molecule; Tacrolimus — Small molecule.