5. Concurrent use of medications that may potentially interact with study medications including: astemizole, terfenadine, rifampin, dihydroergotamine, ergonovine, ergotamine, methylergonovine, cisapride, St. John's wort, lovastatin, simvastatin, pimozide, midazolam, triazolam, adefovir, cidofovir, acyclovir, ganciclovir, and valganciclovir.