Currently, there is a big taboo on making drugs that should be used by someone that is considered healthy and usually, regulators like the FDA don't authorize studies on this matter. Nonetheless, it's possible that certain substances could be helpful to all the people (like vaccines)

If a non-vaccine drug is approved and it's recommended by the relevant U.S. authorities to be used by most adults (it's possible it was some populations where it's bad, like say pregnant women), this market resolves to YES.

I'll rely on official sources and the mainstream media (NYT, WaPo, The Economist, FT, WSJ, Bloomberg, CNN, CBS...)