I have a few cases of depression when person stabilized on mirtazapine (taken for several weeks without reaction) got additional SSRI drug (no matter which) there was a good antidepressant reaction but very short-term (about a day) and does not appear anymore despite continuation of both drugs. And this reaction does not appear when both drugs were started simultaneously. Any ideas why there is such reaction? What biological synergy was behind it, and most important: how maintain this antidepressant reaction? What drugs can be taken instead of mirtazapine? Thanks.

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