TASK DEFINITION: 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.
PROBLEM: Pigmentary aberrations are well known side effects of cytostatic chemotherapeutic agents.

SOLUTION: non-adverse drug event

PROBLEM: Pravastatin is associated with myotonia in animals.

SOLUTION: adverse drug event

PROBLEM: Thrombin is highly effective for stopping intractable arterial hemorrhage during stereotactic brain biopsy; however, it is a vasospastic agent and may have been responsible for the cerebral infarctions in one patient.

SOLUTION:
adverse drug event