Waivers are case by case based on the candidates medical records, it is not a flat decision, hence nobody can tell you if it is possible for you personally. I am sure there are anecdotal stories of yes and no, but the reason you have both answers is due to the fact that it is case by case.
The thing is whether you fill that script or not really doesn't matter because one of the questions you will be asked is:
Have you ever been prescribed medicine for any condition? If so, what?
Your answer must YES. Prozac.
Not taking it is your choice, but even if you don't fill it, on your medical records it will show what the doc prescribed, when, how much and for what. On the form you will admit it. The questionnaire does not ask if you took the prescription, they will assume you followed your docs medical orders.
Be honest, move forward with your plans. I.E. make sure you have leadership and athletics in your resume, take the most rigorous curriculum you can, study for your PSAT/SAT/ACT.
It is hard and I know you want answers, but the answer is you will be required to acknowledge your OCD diagnosis and Prozac. It probably will set off the DQ alarm, and either remedial/waiver or both. The importance is the branch waives, and if you are a competitive candidate, and if it can be waived your chances are higher, than if you are not a competitive candidate.
Why risk the chance on a candidate that needs a waiver with no ECs, eh PAR and mediocre CFA over a candidate that also needs a waiver, was Team Captain, Eagle Scout, top 1% of their class, NMF candidate, and maxed the CFA?
This is out of your control right now, what is in your control your ability to be the best candidate regarding the Whole Candidate Scoring system.
Remember DoDMERB DQ's, branches waive. As Dad illustrated AF may waive and Navy won't.