“Follow market forces” really just means people respond to price information. If price information is corrupted or obscured (as in healthcare) then yes, market forces do not work.
The solution though is to return to accurate price information (freer market), not to further obscure price information by adding new rules, laws, and bureaucracy.
That would be helpful at least. There are a lot of ways prices have been obscured over time. I think Americans often pay more for drugs to cover selling them cheaper in poor nations.
& you're right prices can be inelastic (needing treatment for a life-threatening disease). But markets generally create alternatives & competition drives down prices/increases quality
Pharmaceutical companies give away a lot of parasite drugs to third world nations for free. Some of the cheaper drugs are to compete with generic versions though. Some are offset price