Why are there so many pharmaceutical drug commercials on national news programs?

Everytime I watch the evening national news, or any other national news programs, about 50-70% of the commercials are pharmaceutical drug commercials, with at least one of them being a perscription drug ad, which are very annoying with all the rish information. I wonder why there are so many drug commercials on tv... show more Everytime I watch the evening national news, or any other national news programs, about 50-70% of the commercials are pharmaceutical drug commercials, with at least one of them being a perscription drug ad, which are very annoying with all the rish information. I wonder why there are so many drug commercials on tv during national news programs? Why isn't there much other variety?
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