Merck told FDA that unbranded “Help-seeking” search ads for drugs, which have proliferated over the past year, are misleading and lack transparency.

In response to the agency’s call for comments on the use of the Internet and social media for drug promotion, Merck said such sponsored links “may lack transparency.”

“An individual searching for information on depression, for example, may view a sponsored help-seeking ad as confusing or worse, potentially deceptive, if the link provided redirects to a company-sponsored product website instead of a disease-specific website,” said the company.