Uptodate is really overwhelming from a medical student perspective. I don't need all this detailed information on primary literature and stuff at my level. Medscape gives the distilled down version that is exactly what I need.Use it all the time cause uptodate has a really crappy layout
Second Epocrates! They have a great iPhone app (not sure about Android).Medscape for general overview. UpToDate for the nitty-gritty details and sources of evidence (primary literature). Epocrates Online for medication dosing.