The company noted that the network of these accounts operated in Russia.
Alongside other efforts, TikTok, Instagram and Pinterest will all surface support materials based on users' searches and posts.
Pages, groups and ads whose content includes "verifiable vaccine hoaxes" will be taking a backseat.
UK health and social care secretary Matt Hancock previously warned social media firms that "more action is urgently needed" to protect children online.
Users who click through the popup will be provided with anonymous support hotlines, a treatment facility locator, peer support guidance, and other substance abuse education.