Side Effects is the 3rd Main Single from House DJ Z-2's Debut Album The Space Warrior and features vocals from Gwen Stefani. It was released on May 10, 2014, and currently tops the Billboard Hot 100, making the song Z-2's first #1 single and featured singer Gwen Stefani's 3rd #1 single since Hollaback Girl in 2005 and The Sweet Escape (ft. Akon) in 2007.
The music video is part of the Space Warrior film based on the album, where it shows Ashley getting captured by the FBI despite fending them off in a mall. Elsewhere, Gwen Stefani is singing her vocals behind a white background.
A Lyric Video was released before the film's release date, which shows various creepypastas combined with techno / sci-fi / visual elements, similar to those from the music video of Zedd's Clarity.
An alternate video was released on June 17 2014, which is the same as the lyric video, but has Z-2 and Stefani performing behind the creepypastas (with techno / sci-fi / visual elements).