Alendronate, atorvastatin, doxercalciferol, doxycycline (should be taken at least 1 hr before Velphoro), levothyroxine (not to be prescribed w/ Velphoro) & paricalcitol. May affect bioavailability of other medicinal products; consider separate administration w/ oral medications where bioavailability reduction would have a clinically significant effect on its safety or efficacy. Concomitant treatment w/ medicinal products w/ narrow therapeutic window; monitor clinical effect & adverse events.