I used the wrong word, not caution but if you can get propecia. This has only been my experience, first of all its important to take the pills in the morning because it seem dht-levels rise during the day and fall at night. and secondly, when you cut the tablets you get fluctuating amount of dosage in your system , sometimes less sometimes more etc., I have been cutting pills from proscar for nearly eight months now and I have taken it consistently and the results were not that great. only recently a few weeks I have started propecia and the constant dosage in the morning effect seems to have been a good combination because it is finally seems to be having a much more consistent effect than the the proscar. just my two cents.