Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Direct-to-consumer advertising (DTC advertising) usually refers to the marketing of pharmaceutical products but can apply in other areas as well. This form of advertising is directed toward patients, rather than healthcare professionals. Forms of DTC advertising include TV, print, radio and other mass and social media. There are ethical and regulatory concerns regarding DTC advertising, specifically the extent to which these ads may unduly influence the prescribing of the prescription medicines based on consumer demands when, in some cases, they may not be medically necessary.