"Side Effects" is a song by American singer and songwriter Mariah Carey from her eleventh studio album, E=MC² (2008). It was written by Carey, Scott Storch, Crystal Johnson and the song's featured artist, Young Jeezy. It was inspired by Carey's marriage to record executive Tommy Mottola and his controlling nature over her and her career. Carey discusses how she still deals with the side effects of the experiences that she encountered during the relationship. Critical response to the song was positive, with many critics highlighting it as an album standout, praising its candid lyrics and honesty. It charted at number 93 on the US Billboard Pop 100 chart.