An outright ban would be very difficult now that the genie is out of the bottle. The FDA can regulate what goes in the ads, like requiring disclosure of the expected benefit, how prevalent some of those side effect them mention are, how common the condition it's meant for actually is, and of the list price of the medication. Many of these drugs are for rare conditions and the drugs, though approved, help a smaller percentage of patients than the ads portray and to a lesser extent.