If one had been prescribed an anti-anxiety medication in the pass, would that disqualify them from working for

No. Just because someone was treating an illness, mental or physical, should not make a difference. It would be worse if you had an illness and did not treat it. Whether a person gets the job or not will depend on everything else, namely education, intelligence, past criminal record, employment and personal references, commitment, attitude, background check and a face-to-face interview.

F.BI. is one of the hardest positions to get. They do a thorough background check and you have to be unbelievably smart with above average high scores on tests. A anti-anxiety medication would not disqualify anyone, in fact that is against the law to discriminate. Now if you were ADDICTED to them or you had some sort of dependency on anything really, that could factor you out. If you are anxious because of a deeper mental illness that could interfere with your ability to do your hard job, than you absolutely would not get hired.

It shouldn't automatically disqualify you. Things change in a person's life, and just because you needed meds in the past doesn't mean you can't do a future job.

It may limit you, but the poor spelling in your question may be a bigger issue in landing a job.