My problem is though my eyes see it, I don’t register it after a couple days. I have a horrible, horrible time remembering mid-afternoon doses. I have no idea if doubling up is a good idea. Like Beth mentioned I think the idea is to have a stable blood level. The reason we supposed to take our meds on a regular schedule. Fortunately the only med I take in the afternoon is iron. I forget so often I have no idea if my blood level has gone back to normal or not. My doctor prescribed it but hasn’t followed up with any tests.