You're "dead" wrong on that. It’s price is high in the US because it costs about a billion dollars to complete all of the testing required to get a new drug approved by the FDA. Then, they can only recover that cost during the time of the patent coverage, because the patent is required to give sufficient information for anyone else to produce it.
You are confusing cost and price. The price is what it is because US patent law gives them exclusive use of their intellectual property which allows them to recoup the cost. But other countries don’t. So the price is low. That doesn’t make the same drug produced elsewhere inferior.