Don't allow patents on medication would be a good start
This is a very slippery slope to go down.
On one hand, restricting patents on medication would allow more competition to be introduced into the market
But on the other hand, restricting patents would lead to lower incentive for research and development because at the end of the day, pharmaceuticals are an industry like any other. The incentive for R&D is mostly financial.
I don't disagree that patents certainly can do a lot of harm with regards to price inflation of medication, but at the same time they're one of the larger protectors of the incentive for investors. Without capital from investors, where are you going to get all the money to develop new drugs?