The company provides health and benefits information to consumers, employers, doctors and health plans. Its websites include WebMD Health, MedicineNet, RxList and theheart.org.
WebMD has struggled to maintain advertising revenue this year as drug companies cut back on spending. Competition from social networking sites and ad networks also has increased.
Shares of WebMD slipped 22 cents to $13.63 in premarket trading. The stock closed Monday at $13.85, down 63 percent since the start of the year.