WASHINGTON — As federal regulators take their first tentative steps toward policing the wild west of medical information online, pharmaceutical companies are pressing their case to market drugs via Google, Twitter and other Web sites.

The Food and Drug Administration will convene a two-day meeting beginning Thursday to hear the drug industry's position on Internet marketing. The agency has agreed to consider developing rules for online advertising after companies complained that the current guidelines for traditional media — which require a detailed list of possible side effects — have left them hamstrung on the Web.

An estimated 83 percent of Internet users search for health information online, according to a recent survey from the Pew Research Center.

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