Introduction
An omitted, incorrectly dosed, or interacting medication may be the cause of patient symptoms at hospital presentation. An accurate and complete admission medication history facilitates identification of medication-related problems on admission; however, if the list of medications obtained during the medication history is not reliable, then linking a patient’s symptoms to a medication-related problem becomes a more difficult task. Despite efforts by hospitals to compile reliable medication histories, errors may occur, and the clinician should consider a medication history error when the clinical picture and the medication history do not align. In these cases, applying the simple proverb “trust but verify” may provide the elusive piece needed to solve a diagnostic puzzle. Here we describe an application of “trust but verify” leading to the diagnosis of a patient’s mystery illness.