A patient complains that she doubled the maximum dose of acetaminophen for her headache but two hours later she still hasn't received any relief. What is the most likely problem? Select one: Oa She...

Extracted text: A patient complains that she doubled the maximum dose of acetaminophen for her headache but two hours later she still hasn't received any relief. What is the most likely problem? Select one: Oa She hasn't taken enough medication to get the maximum results. Ob. She hasn't reached the therapeutic index. Oc She doesn't have any drug receptors. Od. She has reached the drug's ceiling.