As part of the post offer medical screening, you will be required to disclose all medications you are taking as well as undergo a psychiatric evaluation. Intentionally concealing it would be grounds for disqualification. Whether it will be a concern for an agency is something I cannot answer.
I didn't mean to imply you would, only that you should be careful not to conceal it. A background investigator for the agency will not ask about this ... or should not. The inquiry here will occur after a conditional job offer and will be done by medical and psych professionals. If it is anything like it is here, the full psych report will be provided to the agency's executive and then either returned or destroyed. All the official record should receive is notice that you met the medical requirements and the psych exam found you acceptable (or not).