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: Methotrexate-induced pneumonitis in patients with rheumatoid arthritis and psoriatic arthritis: report of five cases and review of the literature.

Answer: adverse drug event


Question: 2-CdA induces lymphocytopenia, which may explain the improvement in this patient's psoriasis.

Answer: adverse drug event


Question: Because etoposide-induced pulmonary toxicity is an uncommon but serious adverse event, clinicians must be vigilant about the possibility of it, so that the optimal treatment can start as soon as possible.

Answer:
adverse drug event