While everybody reacts differently by week 4 it should be shutting you down, however everybody is different, but EVERYONE will tell you for any oral aas you want to use test as a base, test must always be included in a cycle and of course followed by propper post cycle therapy (pct), however most people will not actually listen to the advice given on here, and you'll probably go ahead and do a dbol only cycle anyway, and if you're adament on doing this i strongly suggest you read up on Bill Roberts 2 on 4 off theory, and ALWAYS have some nolvadex at hand.