Lexi-comp Herb-to-Drug, Herb to Herb Interaction GuideThis is a complete drug and herbal interaction analysis program. Enter a patient’s entire regimen, identify potential interactions, and obtain appropriate patient managements steps. The analysis includes a summary of drug interactions with an assigned risk rating to identify the action steps necessary. Each letter designation (A, B, C, D, X) represents the severity level of the identified interaction. A detailed interaction monograph is displayed by clicking on the interacting drug name.