What characteristic defines Schedule V medications?

Schedule V medications are characterized by their relatively lower potential for abuse compared to medications in Schedules I-IV. A key feature of Schedule V medications is that they include certain medications that can be sold over-the-counter (OTC) in certain states or under specific circumstances, particularly those containing small amounts of certain narcotics. This classification allows for greater accessibility while still maintaining some level of regulation to prevent misuse. This OTC availability is particularly relevant for medications used to treat conditions like cough or diarrhea, which may have active ingredients that are controlled substances but are considered to have a low risk of abuse when used appropriately.

The other characteristics mentioned in the other options do not apply to Schedule V medications in the same way, such as the absence of prescription requirements or the assumption that all are used for anti-anxiety treatment. It's also crucial to note that Schedule V medications do not hold the highest potential for abuse, which is a defining feature of the higher schedules like Schedule I.