Top 10 most expensive prescription drugs in the US by price and by sales volume

On the heels of President Donald Trump’s Monday announcement of an executive order that will slash prescription drug prices in the U.S., the spotlight is on current costs and how much Americans could save.

The president’s order calls for "most favored nations drug pricing" — which means "the lowest price paid for a drug in other developed countries, that is the price that Americans will pay," he said.

"Some prescription drug and pharmaceutical prices will be reduced almost immediately by 50 to 80 to 90%," Trump said.