I can't remember all of the times that people come in for early refills on meds that affect their CNS.
Not just people but the doctors who prescribe them. My doctor has put me on 'preventative' antibiotics many times and the instructions on the bottle are very specific to TAKE THEM ALL! The last few times I haven't filled the prescription. I don't need to built a tolerance to something that could save my life later.
Lately I've just stopped going. If I get the sniffles I just take care of myself and it passes. If I keep it up after I feel better, I continue to feel better. I've been feeling under the weather once in the last year...that's some real prevention.