Before this thing is used, the person who casts the gu poison must feed it with their own blood, and the antidote will only be effective if it is mixed with the caster's blood.
Apart from this, there is no other way.
After the desire-eating gu is planted into a human body, it lies dormant in the woman's yin palace. Once the person poisoned is stimulated by the primordial yang of a man through the union of fish and water, the desire-eating gu will awaken, emerge from the yin palace, and burrow into the man's vital part. What follows next...
Chapter 183