Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Promoted
2 Answers
Relevance
- ?Lv 71 decade agoFavorite Answer
It means works against it. So for example caffeine is a stimulant and barbiturates are downers. When taken together the work in opposition to one another
- 1 decade ago
It means that one drug works against another. Neither drug can work properly in the body at the same time.
Source(s): experience
Still have questions? Get your answers by asking now.