The below table gives us information about planets, their placement and also it would give information as to which planet considered other planet as enemies from their natal postion. During the Antar dasa of these planets operating native would face troubles as the Maha dasa would consider the antar dasa planet as its enemy and the significance is destroyed

Ex:I am Under Maha dasa of Saturn with the Antara of Venus.  From the table you would find that Saturn the 6th house and the planet placed would becomes the enemy and it destroys it. In my chart Venus is the 6th from Saturn hence the karkatwa and the placement gets destroyed.  Venus is in my Lagna.  Venus is the lord of the 10th house(career is destroyed), Venus is the karakatwas for spouse(so spouse health is destroyed) and Venus is in Lagna (hence so growth is destoryed)