Loading dose and maintenance dose are the important dosage types. The video explains them in a differentiating manner. TIMELINE: 0:00 Introduction 0:06 Route of administration of drug 1:00 Making a drug work 1:39 Half life 2:56 Steady state 3:41 Intravenous infusion 5:33 Loading dose 6:47 Maintenance dose 7:47 Final thoughts