The Client Receives Verapamil (Isoptin)

The client receives verapamil (Isoptin) . The client asks the nurse if it is okay to take herbal supplements with this medicine. What is the best response by the nurse?

A) "Most herbal supplements are okay, but you should avoid St. John's wort."
B) "Using herbal supplements may increase your blood pressure too much."
C) "Using herbal supplements may lower your blood pressure too much."
D) "Herbal supplements are okay as long as you take calcium salts with them."