I’ve found Amdro to be virtually worthless, though my problem was with carpenter ants.
What worked for me were these products (you need both):
http://store.doyourownpestcontrol.com/maxforce-carpenter-ant-bait-gel
http://store.doyourownpestcontrol.com/advance-375a-select-ant-bait
Ants love this stuff.
Bottom line-anything you can buy in a Lowe’s type store is not likely to work.
Amdro killed all my fire ants.
This is what killed the Carpenter Ants for me.
I don't have an ant problem any more.
I guess it depends on what kind of ants, but Amdro really works well on fire ants.
I still have scars from fire ant stings decades old.
They are EXTREMELY nasty.
Carpenter ants eat your house. Fire ants eat YOU!