antagonism
situation in which two chemicals upon interaction interfere in such a way that the action of one partially or completely inhibits the effects of the other
en-US/ænˈtæɡəˌnɪzəm/
en-GB/ænˈtæɡənɪzəm/
situation in which two chemicals upon interaction interfere in such a way that the action of one partially or completely inhibits the effects of the other