Is there a drugresistance frm using benzoylperoxide for a long time? I stop using it for 3wks then restartd, it seems that its not workin as gud as b4.

No resistance. One of the benefits of benzoyl peroxide (bpo) has always been that it has not yet been shown to cause drug resistance to the bacteria involved in acne, "p. Acnes". Unfortunately, acne is a slowly responding condition. I would recommend giving the bpo another month before you give up on it.