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: Five days after the 3rd booster dose, in November 1996, the dermatosis relapsed on the forearms, trunk, and legs.

Answer: non-adverse drug event


Question: Osteomyelitis occurring during infliximab treatment of severe psoriasis.

Answer: adverse drug event


Question: The authors think that although lamivudine is widely used and well tolerated, it can cause ADRs, which are reversible after drug withdrawal.

Answer:
adverse drug event