The phrase "potent antidote" means a very strong remedy or solution that can counteract or neutralize the effects of something harmful or dangerous. Full definition
The study of ancient liturgical materials is a potent antidote to the cultural captivity of Christianity in this or any other culture, for liturgies embody ancient wisdom. (religion-online.org)
Immunity Soup Recipe This soup's «monster white pepper broth» is a potent antidote for clogged sinuses and a sore throat, especially when served piping hot. (sonima.com)
Also a potent antidote to sitting as it realigns the spine. (vistayoga.com)