Pharmaceutical marketing aims to educate consumers and healthcare professionals about new treatments. While some question the value of marketing, it plays an important role in disseminating medical information. Recent changes include voluntary principles for direct-to-consumer ads and a strengthened industry code of ethics. Studies show marketing helps address underdiagnosis and undertreatment by raising disease awareness and prompting patients to see doctors. However, most physicians say clinical knowledge and patient needs strongly influence prescribing over marketing.