At the physician's request, Tony is attempting to enter a prescription for Mrs. Johnson for her high blood pressure. The EHR system keeps reporting an error: Incompatible medication. What might this mean, and what should Tony do about it? 

A. The medication is not yet entered into the EHR system, so Tony should add it before entering the prescription.
B. The medication Tony is trying to enter has not yet been approved by the FDA, so he should enter another drug instead.
C. Tony misspelled the name of the medication, so he should check the spelling and try again.
D. Mrs. Johnson is either allergic to the medication or is taking another medication that interacts with it; Tony should consult the physician.
E. The medication is not on Mrs. Johnson's insurance list of covered medications; he should enter another drug instead.

D. Mrs. Johnson is either allergic to the medication or is taking another medication that interacts with it; Tony should consult the physician.
Because the EHR program communicates with Mrs. Johnson's medical record, it can flag any allergies or possible medication interactions for an ordered medication.