title: Hypertensive urgency induced by an interaction of mirtazapine and clonidine.
abstract: Mirtazapine is a new antidepressant with a tetracyclic chemical structure that is not related to selective serotonin reuptake inhibitors, tricyclic antidepressants, or monoamine oxidase inhibitors. The antidepressant effect results from stimulation of the noradrenergic system through antagonism at central (alpha2-inhibitory receptors. Clonidine exerts its antihypertensive effect by stimulating these receptors to cause a reduction in endogenous release of norepinephrine. Therefore, the two agents have mechanisms of action that potentially oppose one another. We report a case of hypertensive urgency that ensued after a patient stabilized on clonidine began taking mirtazapine.
authors.affiliation: Department of Pharmacy Practice, The Cleveland Clinic Foundation, Ohio, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Abo-Zena
authors.forename: M B
authors.initials: MB
authors.lastname: Bobek
authors.forename: R A
authors.initials: RA
authors.lastname: Dweik
mesh_terms: D000316:Adrenergic alpha-Agonists / Q000009:adverse effects* / Q000627:therapeutic use; D000317:Adrenergic alpha-Antagonists / Q000009:adverse effects* / Q000627:therapeutic use; D000328:Adult; D000928:Antidepressive Agents / Q000009:adverse effects / Q000627:therapeutic use; D000959:Antihypertensive Agents / Q000009:adverse effects / Q000627:therapeutic use; D003000:Clonidine / Q000009:adverse effects* / Q000627:therapeutic use; D003863:Depression / Q000188:drug therapy; D004347:Drug Interactions; D006801:Humans; D006973:Hypertension / Q000139:chemically induced* / Q000188:drug therapy; D008297:Male; D008803:Mianserin / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D000078785:Mirtazapine
chemical_list: D000316:Adrenergic alpha-Agonists; D000317:Adrenergic alpha-Antagonists; D000928:Antidepressive Agents; D000959:Antihypertensive Agents; D008803:Mianserin; D000078785:Mirtazapine; D003000:Clonidine