Over-the-counter (OTC) is a term used to describe drugs or other products that can be purchased without a prescription. However, there are several synonyms for "over-the-counter". One of the most commonly used terms is "non-prescription", which is often used interchangeably with OTC. Other words that can be used to describe over-the-counter products include "off-the-shelf", "retail", and "conventional". These words can help differentiate between products that require a prescription and those that do not. Another term that is gaining popularity is "direct-to-consumer," which highlights the fact that these products can be purchased without the involvement of a healthcare provider. Overall, while each synonym focuses on a slightly different aspect of the concept, they all generally refer to the same thing.