I have been having isotretinoin capsules for my acne problem for a long time now... my pimples are cured but whenever I stop d capsules my skin becomes dull and loose and again I start getting pimples... wot shoud I do? and what are d possible side effects of these capsules?

I would start by checking out this FDA website:

Isotretinoin (marketed as Accutane) Information (http://www.fda.gov/cder/drug/infopage/accutane/default.htm)