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.
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Question: Clinical recovery required an average of 42 days and was complete in four of five patients.

Answer: non-adverse drug event


Question: No explanation for this delay was found, other than the possibility that magnesium sulfate treatment impeded lactogenesis.

Answer: adverse drug event


Question: Nitric oxide, a potent smooth muscle relaxant, has been shown to be involved in the initiation and maintenance of erections; future research involving specific inhibitors of this chemical is indicated for the possible treatment of intraoperative penile erections.

Answer:
non-adverse drug event


