Demi Lovato was rushed to an L.A. hospital after suffering what appears to be a heroin overdose ... law enforcement tells TMZ. Law enforcement sources tell us Demi was treated with Narcan -- an emergency treatment for narcotic overdoses -- at her home. We've confirmed the OD occurred at her house in the Hollywood Hills. Harvey Levin breaks down the news on Demi Lovato. Leave your thoughts in the comments section below! SUBSCRIBE: http://po.st/TMZSubscribe About TMZ: TMZ has consistently been credited for breaking the biggest stories dominating the entertainment news landscape and changed the way the public gets their news. Regularly referenced by the media, TMZ is one of the most cited entertainment news sources in the world. Subscribe to TMZ on YouTube for breaking celebrity news/ gossip and insight from the newsroom staff (TMZ Chatter & TMZ News), the best clips from TMZ on TV, Raw & Uncut TMZ paparazzi video (from TMZ.com) and the latest video from TMZ Sports and TMZ Live! Keeping Up with Our YouTube Exclusive Content: TMZ Chatter: TMZ newsroom staff insight and commentary from stories/ photos/ videos on TMZ.com TMZ News: The latest news you need to know from TMZ.com Raq Rants: Raquel Harper talks to a celebrity guest with ties to the hip hop and R&B communities. Behind The Bar Podcast: TMZ's lawyers Jason Beckerman and Derek Kaufman loiter at the intersection of law and entertainment, where they look closely at the personalities, events and trends driving the world of celebrity — and how the law affects it all. We love Hollywood, we just have a funny way of showing it. Need More TMZ? TMZ Website: http://po.st/TMZWebsite LIKE TMZ on Facebook! http://po.st/TMZLike FOLLOW TMZ on Twitter! http://po.st/TMZFollow FOLLOW TMZ on Instagram! http://po.st/TMZInsta TMZ on TV & TMZ Sports on FS1 Tune In Info: http://po.st/TMZOnAir TMZ is on iOS! http://po.st/TMZiOS TMZ is on Android! http://po.st/TMZonAndroid Got a Tip? Contact TMZ: http://po.st/TMZTip Check out TMZ Live, TMZ Sports and toofab! TMZ Live: http://po.st/TMZLiveWebsite Subscribe! TMZ Live: http://po.st/TMZLiveSubscribe TMZ Sports: http://po.st/TMZSportsWebsite Subscribe! TMZ Sports: http://po.st/TMZSportsSubscribe Toofab: http://po.st/toofabWebsite Subscribe! toofab: http://po.st/toofabSubscribe https://www.youtube.com/c/TMZ