Hi Cdg121990,
It really depends on a lot of different factors. I would say SSRI deferrals are some of the more difficult to get a read on as far as disposition. You said previous use, so I assume that means you aren't taking presently and haven't been for the last 60 days.
The FAA actually has loosened up a bit recently on the following reasons for SSRI use: bereavement, dysthymia, adjustment disorder, and use for smoking cessation. These can all be issued by the AME without deferral if the SSRI use was less than 6 months and the airman has been off for at least 90 days.
For cases outside of these parameters it will need to go to the FAA for review. They will typically request treatment records and pharmacy records. If the case is reviewed in Oklahoma City it will take as long as it takes for the reviewers to look at your situation. Right now with low staffing that could be awhile.
If possible I would call your regional flight surgeon office and see if they would be willing to review your case. If so find out what documents they require and get them emailed over ASAP. Sometimes that can speed things up.
Best Regards,
Aaron Florkowski, MD
FAA designated Aviation Medical Examiner
www.kansascityame.com