counteractive
adjectiveUK /ˌkaʊntərˈæktɪv/
US /ˌkaʊntərˈæktɪv/
Something that works against something else to stop it or make it weaker.
The doctor gave her a counteractive medicine to fight the infection.
OTHER MEANINGS
2. Having the effect of canceling out or reducing the force of something.
The counteractive effects of the two drugs made the treatment less effective.
3. Acting in opposition to a harmful influence or process.
Exercise can be counteractive to the effects of a sedentary lifestyle.
4. Serving as a remedy or corrective measure.
They took counteractive steps to prevent the spread of the disease.