Effects of Genotype on CYP2C9 Drug Interactions

This research study will help determine how a person's genetic makeup affects their responses to drugs, the ability of the body to break down drugs, and their potential to experience an interaction between drugs. We are investigating the drug interactions between an antifungal drug called fluconazole and the commonly used drugs tolbutamide, flurbiprofen, and ketoprofen. Tolbutamide is used for management of Type 2 diabetes. Both flurbiprofen and ketoprofen are non-steroidal anti-inflammatory drugs (NSAIDs) often used for arthritis or pain. We are interested in studying whether individuals with certain genetic profiles have different drug interactions than normal. This research is being done to see if certain genetic profiles require us to adjust medication doses differently than is needed for the general population. Genetic profiles of subjects are determined from their previous participation in the Pharmacogenetics Registry (Investigator Richard Brundage, University of Minnesota). The study hypothesis is: Fraction metabolized by CYP2C9 enzyme determines the extent of drug interactions in CYP2C9\*1/\*1 individuals but this factor (fraction metabolized) becomes less influential and drug interactions are attenuated in a gene-dose dependent manner in individuals with one or more defective alleles.