A patient has been prescribed a heart medication called Lasix. Since it is available as the generic drug furosemide, you dispense the generic. Why is it appropriate for you to dispense furosemide 40 mg even though the doctor wrote the prescription for Lasix 40 mg? Why is it financially preferable to dispense furosemide instead of Lasix? The patient believes that the generic drug won't work as well as the brand name drug. How do you convince the patient that this is not the case?