Although that is effective, you're still relying on a corrupt court system

No. More exactly - not only on that.

The problem is that manufacturer of some medical shit have overhelming advantage over their customer. The most honest court will rely on hard proofs. And regular customer have no chance to prove that it was a medicine sold by that businessman was a cause of his suffering.

How to resolve that issue? Who should pay for obtaining proof of damage in case of damage from bad medicine? Customer have no such resources, pharma business have, but it will obviously prove that it is innocent. State? Juridical system? How that will look like in case of completely honest courts, free trade and malicious pharma business?