How May SSRI medications increase/cause psychosis or worsening depression?

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I have been on various SSRIs in the past 15 years for anxiety and depression (Prozac, Wellbutrin, Zoloft, Celexa). FYI: I am noticing Celexa is the winner. I have seen in media and criminal defenses that they may cause suicide, further depression, and psychotic episodes. I understand how basic SSRIs work on the brain so how does this happen? What causes the contraindication when these are a drug that should bring mental benefits?

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