The lecture discusses over-the-counter (OTC) medicines. OTC medicines are drugs approved by the FDA that can be purchased without a prescription. The lecture aims to define OTC medicines, identify their advantages, note risks, discuss their use in children, and list common OTC categories. Potential side effects of OTC drugs are also reviewed, such as nausea, vomiting, and dizziness. The speaker emphasizes reading labels, using OTCs only for intended symptoms, and avoiding interactions with prescription drugs.