Under the Influence is the sixth studio album by Americanrock band Warrant released in 2001. The album is a covers album with two original new tracks, "Face" and "Sub Human". The band toured in support of the album with Poison in the summer of 2001 on the Glam Slam Metal Tour which was cut 3 weeks short due to back injuries sustained by Poison bassist Bobby Dall.
The cover of AC/DC's "Down Payment Blues" features guitarist Billy Morris on lead vocals. Morris was the bands newest lead guitarist replacing Keri Kelli who was only in the band for 8 months after replacing Rick Steier in early 2000. The album also features Mike Fasano who became the bands newest in a long line of drummers.