This document provides guidance on pharmacologic interventions for various cardiac dysrhythmias and conditions including bradycardia, tachycardia, cardiac arrest, and shock. It outlines the mechanisms of action, indications, contraindications, dosages, and administration routes for atropine, dopamine, epinephrine, adenosine, diltiazem, metoprolol, amiodarone, lidocaine, magnesium sulfate, and vasopressin.