olanzapine and Colitis--Ischemic

Ischemic colitis (IC) is an uncommon adverse event associated with antipsychotic agents, more commonly found with phenothiazine drugs and atypical neuroleptics such as clozapine. The risk of developing ischemic colitis increases when anticholinergic drugs are associated. We report the case of a 38-year-old woman with a history of schizoaffective disorder who had been on chronic quetiapine for 3 years, and presented to the ER because of diarrhea for 5 days. Four months previously, olanzapine had been added to her psychiatric drug regimen. Physical examination revealed abdominal distension with abdominal tympanic sounds and tenderness. Emergency laboratory tests were notable for increased acute phase reagents. Tomography revealed a concentric thickening of the colonic wall in the transverse, descending and sigmoid segments, with no signs of intestinal perforation. Colonoscopy demonstrated severe mucosal involvement from the sigmoid to the hepatic flexure, with ulcerations and fibrinoid exudate. Biopsies confirmed the diagnosis of ischemic colitis. The only relevant finding in her history was the newly added drug to her baseline regimen. An adverse effect was suspected because of its anticholinergic action at the intestinal level, and the drug was withdrawn. After 6 months of follow-up clinical, laboratory and endoscopic recovery was achieved. Therefore, antipsychotic medication should be considered as a potential cause of ischemic colitis, particularly atypical antipsychotics such as clozapine and olanzapine; despite being uncommon, this adverse event may result in high morbidity and mortality.

Topics: Adult; Benzodiazepines; Colitis, Ischemic; Colonoscopy; Female; Humans; Olanzapine; Psychotic Disorders; Selective Serotonin Reuptake Inhibitors; Tomography, X-Ray Computed

Ischemic colitis is the most common subtype of intestinal ischemia usually resulting from vasospasm, vessel occlusion or mesenteric hypoperfusion. Neuroleptics have seldom been linked to ischemic colitis by blocking peripheral anticholinergic and antiserotonergic receptors inducing severe gastrointestinal paresis. We report a young patient with severe ischemic colitis requiring surgery due to necrosis of the bowel. After exclusion of other potential causes, olanzapine was admitted as the cause of ischemia. Clinicians should be aware of how to recognize and treat the potentially life-threatening effects of neuroleptics.

Topics: Adult; Anastomosis, Surgical; Autistic Disorder; Benzodiazepines; Colitis, Ischemic; Colonoscopy; Humans; Male; Olanzapine; Selective Serotonin Reuptake Inhibitors

Ischemic colitis is a rare adverse effect of antipsychotic medications and is most commonly associated with the phenothiazine class of antipsychotics and atypical antipsychotics such as clozapine and olanzapine. The risk is further increased when antipsychotics are taken in conjunction with anticholinergics. A 27-year-old man with a history of bipolar disorder and depression presented to the emergency department with 6 days of constipation, abdominal pain, nausea, and nonbloody vomiting. He later developed multiple episodes of hematochezia and fever. Within the preceding 2 weeks, his medication regimen of divalproex sodium, aripiprazole, and trihexyphenidyl, had been changed to olanzapine, benztropine, and bupropion. The patient's physical examination showed diffuse abdominal tenderness, guarding, and distension and laboratory tests revealed a leukocytosis. A computed tomographic scan of the abdomen/pelvis showed colitis extending from the splenic flexure to the sigmoid colon, without evidence of perforation. A colonoscopy revealed severe ischemic colitis involving the descending and sigmoid colon, which was confirmed on biopsy. Given the temporal association between the new medications and onset of symptoms, the patient's ischemic colitis was likely caused by olanzapine or the combination of olanzapine and benztropine, likely secondary to their anticholinergic properties. Thus, providers should take a thorough history and counsel patients regarding the risks of constipation when starting antipsychotic medications, particularly those with anticholinergic activity. Despite the fact that ischemic colitis is such a rare adverse effect of antipsychotic medications, it is important to consider because of its potentially fatal outcomes.

Topics: Adult; Antipsychotic Agents; Benzodiazepines; Benztropine; Bipolar Disorder; Colitis, Ischemic; Drug Therapy, Combination; Humans; Male; Muscarinic Antagonists; Olanzapine; Tomography, X-Ray Computed