“…However, the majority of the authors cited patient factors as the cause of ADRs such as advanced age, lack of patients' education and patients' comorbidities [4, 26, 28-31, 34-38, 40, 42]. Some studies mentioned drug related causes such as prescribers' errors, inconsistent consultation notes, incomplete physical examination, inappropriate follow up and monitoring errors as causes of ADRs [26,27,35,36,38,41,44]. Drug specific causes such as drug administration, dispensing errors, drug interactions and look alike medications were also mentioned by three studies [27,30,35,43].Allergic reactions were cited as the cause of ADRs in one study by Shehab et al [39] Iatrogenic causes was also cited by one study amongst other causes [42].…”