Adverse drug reactions are appreciably harmful or unpleasant reactions resulting from an intervention related to the use of medical products, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product. Given medical case reports extracted from MEDLINE, the task is to classify whether the case report mentions the presence of any adverse drug reaction. Classify your answers into non-adverse drug event and adverse drug event.

[Q]: Two patients treated with alprazolam had histories suggestive of a bipolar disorder and developed lithium-responsive manic episodes.
[A]: adverse drug event


[Q]: In patients with cirrhosis, the metabolism of meperidine is decreased, leading to accumulation of the parent drug and possible CNS depressive effects similar to hepatic encephalopathy.
[A]: adverse drug event


[Q]: PURPOSE: To describe a case of progressive outer retinal necrosis in a human immunodeficiency virus-negative immunosuppressed patient undergoing treatment for graft-versus-host disease after bone marrow transplantation.
[A]:
non-adverse drug event


