There has to be more to it. If not, a simple refusal to sell would allow you to move the market. If the sellout bundle is profitable enough, why doesn’t everyone start a generic drug company to be sold and retire rich?
Then the competition moves money from profit markets to undercut you... making it impossible to compete... your competition subsedize the costs and effectively sell for 20% below cost until you agree to sell or close shop
small businesses generally can't launch everywhere. a big drug manufacturer can switch to selling at cost in a region for a few months to kill the profit opportunity of a young competitor. also, once they've done that a few times, it prevents others from trying