You are off by a factor 10. The 1 billion is in total over all the time needed to produce the drug (about 10 years), while ads are per year.
https://www.statista.com/statistics/817534/annual-novel-drug...
I don't see any reason to believe that pharma spends more on ads than R&D. Do you?
Pull a public filing for these companies and take a look at their balance sheets; it's pretty straight forward.
No.
> Do you?
The fact that you just reposted your above comment without any change despite knowing it was wrong and despite being called out on that. That seems like a strong point in favor of the opposite of whatever your position is.