The phrase "effective antidote" refers to a solution or treatment that successfully counteracts or neutralizes a problem or harmful situation. It is like a cure that effectively helps fix or prevent something negative from happening. Full definition
She told MPs: «Twitter was in a place where it believed the most effective antidote to bad speech was good speech. (businessinsider.com)
A lot of coding and other activity may make your engineers feel better (it's a somewhat effective antidote for anxiety), but it's not likely to be moving the ball up the field or leading your business to a better result for your clients unless it's informed by actual and timely customer input. (inc.com)
Science education and science media can be highly effective antidotes if done well. (discovermagazine.com)