The addition of mirtazapine to an monoamine oxidase inhibitor (MAOI), while potentially having typical or idiosyncratic (unique to the individual) reactions not herein described, does not appear to cause serotonin syndrome.[1] This is in accordance with the fact that the 5-HT2A receptor is the predominant serotonin receptor thought to be involved in the pathophysiology of serotonin syndrome (with the 5-HT1A receptor seeming to be protective).[64][2] Mirtazapine is a potent 5-HT2A receptor antagonist, and cyproheptadine, a medication that shares this property, mediates recovery from serotonin syndrome and is an antidote against it.[65][66]