This is for those of you Who don't have the cracked or "Magic Keyed" version of I-Doser.  
For unlimited Doses, follow these steps:

1.  create a folder on your desktop and put all of your doses in it

2.  right click on the folder and Send To > My Documents


Alternate method:

After you use up a dose, open the dose with WOrdpad or Notepad.  Now change a few characters 
on the first line.  This seems to work with some, but not all, doses .


You will now have fully working duplicate doses!  Proceed to frying your brain with virtual drugs!!!!