Well Wintergreen...there is only one way to find out and that is to try it again. It does seem that with some of these anti-depressants, you build up a tolerance for them.
Talk to your doctor about taking it...and think about what dosage is appropriate. And also have Plan B in mind if the Prozac doesn't work again.
Let us know what happens...I am very curious. Hopefully others can chime in with their experience.
Thank you for your question!