most of us know that ketotifin should be taken with clen, on a side note lots of us also know that benadryll is a perfect substitute for ketotifin its over the counter, the reason why ketotifin and clen are used in conjunction is because your body is unable to use clen as efficiently after around 21 days and ketotifin or benadryll counteract this letting the person extend their cycle of it however a much better choice rather than benadryll or ketotifin is Unisom just use half the amount of unisom that you would use in according to benadryll