Supported by a usage history that predates written records and the perception that "natural" ensures safety, herbal products have increasingly been incorporated into Western health care. Consumers often self-administer these products concomitantly with conventional medications without informing their health care provider(s). Such herb-drug combinations can produce untoward effects when the herbal product perturbs the activity of drug metabolizing enzymes and/or transporters. Despite increasing recognition of these types of herb-drug interactions, a standard system for interaction prediction and evaluation is nonexistent. Consequently, the mechanisms underlying herb-drug interactions remain an understudied area of pharmacotherapy. Evaluation of herbal product interaction liability is challenging due to variability in herbal product composition, uncertainty of the causative constituents, and often scant knowledge of causative constituent pharmacokinetics. These limitations are confounded further by the varying perspectives concerning herbal product regulation. Systematic evaluation of herbal product drug interaction liability, as is routine for new drugs under development, necessitates identifying individual constituents from herbal products and characterizing the interaction potential of such constituents. Integration of this information into in silico models that estimate the pharmacokinetics of individual constituents should facilitate prospective identification of herb-drug interactions. These concepts are highlighted with the exemplar herbal products milk thistle and resveratrol. Implementation of this methodology should help provide definitive information to both consumers and clinicians about the risk of adding herbal products to conventional pharmacotherapeutic regimens.
With the inclusion of mesentery, the total number of human organs has recently increased by one. The mesentery was formerly construed to be a complex, discontinuous anatomical structure simply serving as a support for organs in abdominal cavity. However, recent research has established the mesentery to be a far more simple and unfragmented organ. Newly emerging information on the mesentery has challenged some older pathophysiological concepts. This review briefly discusses the anatomy of the mesentery, historical perspective on the mesentery, embryology, drug metabolizing enzymes and transporters of the mesentery, and the mesentery's role in diseases. The possible impact of the mesentery on absorption, distribution, metabolism, and excretion (ADME) is also discussed.
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