Francis is a pharmacy technician who is talking to Serra, a patient. Serra was prescribed a non-preferred drug and was worried it was too expensive. Francis looked at the formulary and found a generic drug that she could try. He then told her that if that didn’t work, there was also preferred drug she could try. Finally, if that didn’t work, she could get the non-preferred drug. What did Francis just describe to the patient? open formulary step formulary step therapy tier therapy