I forgot about that. But I don't think it's that big a deal, because for other things, they already set the price:

"The prices that Medicare FFS pays providers are set administratively through laws and regulations, and providers can either take them or leave them."

https://www.cbo.gov/system/files/2022-01/57422-medical-price...

And in 2016 only about 10% of health costs in the US were prescription drugs.

https://www.actuary.org/content/prescription-drug-spending-u...