Final answer:
Medications that can be legally purchased without a prescription are considered over the counter (OTC).
Step-by-step explanation:
Medications that can be purchased legally without a prescription are considered over the counter (OTC). These medications include a wide variety of drugs that have been deemed safe enough for use without the direct supervision of a healthcare provider. Common examples of OTC drugs are aspirin and ibuprofen. It is important to note that even though these drugs are available without a prescription, they should still be used as directed to avoid potential risks, such as an overdose.