Based on the following patient comments, which statement does not show the patient's understanding of their medication regimen?

a. I take my tetracycline on an empty stomach.
b. I finish my whole course of antibiotics, even if I'm feeling better.
c. I do not take OTC dextromethorphan because it will interact with my phenelzine.
d. I take my ibandronate once a week.
e. I take buspirone three times daily for my anxiety.