Even computationally parallel algorithms hopefully have a centralization point where the compulation completes. What's the equivalent for whether or not a drug

Even computationally parallel algorithms hopefully have a centralization point where the compulation completes. What's the equivalent for whether or not a drug is more effective than a sugar pill, given countless edge cases? I could imagine a case where a drug that was never effective is widely distributed before being calculated to be no more effective than placebo. In the meantime, such a widely distributed drug could cause significant harm as it is selected over medication with actual efficiacy or effective drugs avoided due to the side effects of the ineffective one.