I think there should be a single app that
a. provides all the necessary health information (emergency instructions, drug search, doctor and hospital lookup, doctor-patient Q & A, etc)
b. is minimalistic and lightweight to run fast on old devices and 3g connections (emergencies don't necessarily happen inside strong Wi-Fi zone, duh)
c. is free and doesn't bother user with logging in.
I didn't find such an app, so I decided to build one. :D