A heath care provider is reviewing the history of a patient who is about to begin furosemide (Lasix) therapy to treat hypertension. Which of the following drugs that the patient takes should alert the health care professional to take further action?
A. Phenytoin (Dilantin) for a seizure disorder.
B. Lithium (lithobid) for bipolar disorder
C. Warfarin (Coumadin) to prevent blood clots
D. Erythromycin (erythrocin) for bronchitis