Non-prescription drugs, also known as over-the-counter (OTC) medications, are medicines that can be purchased without a doctor's prescription. They are commonly used to treat minor health issues such as headaches, colds, allergies, and digestive problems. Examples include acetaminophen, ibuprofen, and antihistamines. These drugs are generally considered safe when used as directed, but it's important to read labels and follow dosage instructions. Some non-prescription drugs can interact with other medications or have side effects, so consulting a healthcare professional is advisable if you have any concerns or pre-existing conditions.