Main entry: synergistic, interactive
Definition: used especially of drugs or muscles that work together so the total effect is greater than the sum of the two (or more)
Antonyms: incompatible, antagonistic
Definition: used especially of drugs or muscles that counteract or neutralize each other's effect
Main entry: interactional, interactive
Definition: capable of acting on or influencing each other
Antonyms: nonreciprocal
Definition: not reciprocal