You take them all togther. Thats what i did, and what a few i know who took them did.
Best to do is ask next time yoru there, but it wont damage you to take them togther untill then.
I came off mine volentairily, becuase i felt i made myself better not the meds, or the doctors.
While i was on them, on their own, they didnt really help me much, obviously as the meds didnt make me better, you wouldnt expect that. but i have heard good things about Fluoxetine, its also a brand name of prozac just so you know.
If you need any more help let me/us know, i dont mind talking to you about them