Tonic is an American post-grunge rock band formed in 1993 by Emerson Hart, Jeff Russo, Dan Rothchild, and Kevin Shepard. They were signed to Atlas Records and Polydor in 1995.

They released the debut album Lemon Parade in 1996. Singles for the songs Open Up Your Eyes, and If You Could Only See, were released in 1996 and 1997 respectively. If You Could Only See received the honor of being Rock Radio's most played song of 1997. In that same year, the band recorded a song for the Scream 2 soundtrack.

Dan Lavery replaced Rothchild on bass in 1998. With Lavery in tow, the band released the now out-of-print EP, Live and Enhanced. Also in 1998, they recorded songs for the soundtracks to The X-Files and Clay Pigeons.

The band returned to the studio to finish and release the second album Sugar in 1999. Knock Down Walls, along with You Wanted More were charting singles released off that record, with the latter having first appeared on the soundtrack to the movie American Pie.

Sugar showed the band as a three piece, as Shepard was no longer a part of the band. The drummer for the album was Peter Maloney although Joey Waronker filled in for the single You Wanted More.

Tonic returned to the charts with their third official release, Head On Straight, and the single Take Me as I Am. Still billed as a three piece band, the drums on Head On Straight were played this time by Joey Waronker. The band also enlisted the help of Keyboardist Will Holis. Hart and Russo both also played piano and Rhodes synth respectivly on the record. This album can be listened to at their official website.