Conspicuously absent from your scenario is the way the doctor becomes aware of the new drug. How does that happen?

By accepting SWAG from the pharma rep, or accepting free trips to conferences sponsored by pharma. If a doctor has not heard about a new drug the their reps just haven't made their way to them yet because they're in a smaller market. The yet is key, eventually a rep will make their way to them. More than likely much sooner than the TV ads run

By researching new drugs? Though sadly at the moment the doctor is also a target of advertising. The point being that this should generally be a pull process driven by a demand (and mediated by neutral review and publication processes) and not a push being driven by a supply (mediated by a process that goes to the highest bidder).

By doing their job instead of hoping a stranger's friend happens to land on a useful ad?

so in your mind "advertisement" covers any transmission of information?

so in your mind, a pharmaceutical company telling a patient that a drug exists is "advertisement" but a pharma company telling a doctor that a drug exists magically isn't?