Which term refers to the trade name of a medication that is used for marketing purposes?

The term that refers to the trade name of a medication used for marketing purposes is the brand name. A brand name is specifically created by a pharmaceutical company for promoting and selling its product. It is often designed to be memorable and marketable, distinguishing it from other medications. This name is used in advertising and packaging, making it recognizable to both healthcare professionals and consumers.

In contrast, the generic name of a medication is its official or chemical name that is not tied to any particular manufacturer. It's important for identifying the medication in scientific terms but lacks the commercial appeal of a brand name. The active ingredient refers to the specific chemical substance in a medication that produces its effects. Finally, a common name is not a standardized term within the pharmaceutical context like the brand and generic names, and it could refer variably to different substances in casual conversation. Thus, brand name specifically denotes the marketed identity of a drug, making it clear why this is the correct choice.