Em, no, ads were always allowed with the first major one was in 1983 for ibuprofen. The only thing that kept them in check was that they needed to post every single risk factor for the drug with a mandatory disclaimer. Direct to doctor adverts were allowed if there was no mention of what the drug was for as a "remember us" thing and drugs like Motrin had few major side effects.
The FDA loosened the rules in 1997 allowing for a quick mention of only the most adverse side effects or a ticker, and Clinton was president. But the FDA Commissioner Kessler made that call that drug companies could just give us the Cliff Notes for risks, had been appointed in 1990 under HW Bush, and there was plenty of bipartisan support for the change. Feel free to remind me of any GOP outrage over major corporations swindling the US public and driving up drug prices....