This is not correct. Here's Pfizer's 2025 annual report [1]. Total expenses for the year were $55.1 billion. Advertising expenses were $2.7 billion of that, or just under 5%. R&D expenses were $12.1 billion, or just under 22%. They do have a lot of SG&A, but the large majority of that is not going to marketing.
reply[1] https://d18rn0p25nwr6d.cloudfront.net/CIK-0000078003/908eb6a...
Advertising is only a subset of marketing. From that doc, look at operating costs: SGA was ~$11B and R&D ~$12B - basically 50/50. Pfizer is very international, so is pretty difficult to break out US operating costs and what marketing vs R&D is for just the US. But one can also assume US marketing is higher than any other nation as direct-to-consumer advertising is primarily only allowed in the US.
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