Antagonistic
From Health Facts
Latest Edit: Iva 2011-06-01 (EDT)
Some botanicals have an opposing of antagonistic action on drugs. For example, botanicals with a high affinity to scavenge free radicals might reduce the efficacy of other drugs.
In an antagonistic reaction you end up with the effect that 1 (drug) + 1 (herb) = 1 (effect) or 1 (drug) + 1 (herb) = 0 (no effect).