Best way to store data in flash?

I’m having trouble figureing out the best way to store data. I’m creating a Flash application for work and basically it’s a module to add a medication to a patients chart. There is a screen with drug name, drug class, dosage, etc. I want to hold this data in an array and then take that data and apply it to a data grid. I’ve done this without the array, but I wanted to use the array because I need to use this data in other ways.

Say I have 4 fields:
Drug Name
Drug Class
Drug Dosage
Reason Taking

Would it be best to have 4 arrays; one for each type of field and then if I want say drug number 5 look at the 5th position in each array?