Over-the-counter drugs, also known as OTC drugs, are drugs that can be purchased without a prescription written by a physician or other medical professional for the convenience of the public and under the premise of ensuring the safety of medication, as prescribed or validated by the state health administration. Most of the over-the-counter drugs can be commonly self-diagnosed for multiple illnesses, such as colds, coughs, indigestion, headaches, fever, etc. For routine treatment, they can be purchased according to the public’s self-identification. These drugs are safer drugs because they have been identified and confirmed to be effective and of stable quality for a long time.