Marketing. They are for the most part chemically identical. When a new drug is created, the company that made it has a patent that says that no one else can use that formula for a certain number of years (I can’t remember how many at the moment). This is so the company that created the drug can recover their research and development costs. Once that patent is up, anyone can make the medicine and they will charge a much lower price since the cost of the actual ingredients is not that much money.
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