What medicine would you choose?

Hypothetical situation here:

Say all the medicines, pharmaceuticals, dietary supplements, vaccines, IV delivered substances, prescriptions, etc had disappeared, worldwide.

What would be the first thing you would want available to you ASAP?

Another way to phrase the question is:

If you had the opportunity to create the first medicine (be it an ointment, hormone supplement, or whatever), what would you choose?

I am not asking for medical advice.

I just want to see what selections could be made and see the line of thought for said selections. I'd like to read the discussion on this too. Thanks in advance.