Do Furanocoumarins Mediate the Fexofenadine-grapefruit Juice Interaction?

• Status: Completed
• Trial end date: 2011-04-01
• Target enrollment: 0
• Participant gender: All

Summary

Purpose: Grapefruit juice is one of the most extensively studied dietary/natural substances shown to interact with a variety of medications. However, unanswered questions remain regarding the causative ingredients and mechanisms underlying such drug-grapefruit juice interactions. Compounds in grapefruit juice called furanocoumarins have been established as major causative ingredients, which act by inhibiting the elimination (metabolism) of drugs, leading to increased circulating drug concentrations. Increased drug concentrations can in turn lead to increased drug potency or even toxicity. Grapefruit juice also has been shown, paradoxically, to decrease circulating concentrations of some drugs, including the non-sedating antihistamine agent, fexofenadine (Allegra), which undergoes negligible metabolism. Whether or not furanocoumarins mediate the decrease in fexofenadine concentrations is unknown. The purpose of the proposed study is to compare the effects of a "furanocoumarin-free" grapefruit juice with grapefruit juice on circulating concentrations of fexofenadine.

• Phase: N/A
• Accepts Healthy Volunteers?: Accepts Healthy Volunteers

Details

• Lead Sponsor: University of North Carolina, Chapel Hill
• Treatments: Fexofenadine; Furocoumarins; Terfenadine

Criteria

Inclusion Criteria:

• Men or women between the ages of 18 and 65

• Normal screening laboratory test results

• Able to understand the informed consent form

• Willing to abstain from grapefruit products and all fruit juices for one week prior to and during the study

• Willing to abstain from alcohol and caffeinated beverages the evening prior to each study day

Exclusion Criteria:

• History of intolerance to grapefruit products

• History of any allergy or hypersensitivity to grapefruit products or fexofenadine

• History of significant medical conditions that the study physician believes would increase risk

• History of significant alcohol abuse and/or illicit drug use

• Tobacco use within the month preceding the study

• Pregnancy or breast-feeding

• Taking concomitant medications, both prescription and non-prescription (including herbal products), known to alter fexofenadine blood levels or P-gp and/or OATP activity (women stabilized on hormonal methods of birth control will be allowed to participate)