The Poison is the debut studio album by the Welsh heavy metal band Bullet for My Valentine. The album was released on 3 October 2005 through Visible Noise Records in the UK, and on 14 February 2006 in the United States, through Trustkill Records. The album included 11 new songs and two previously heard songs, "Cries in Vain", which was previously heard from their self-titled UK EP and from their US EP, Hand of Blood, as well as from "4 Words (To Choke Upon)" was previously included on the same US release. Different editions of the album contain the song "Hand of Blood", previously heard from these EPs, replacing "Spit You Out".
The album received generally positive reviews from the critics with many fans considering The Poison to be the band's strongest album. Corey Apar of Allmusic awarded the album 3 stars out of 5, commenting that the album showed a "melodic metal-meets-emo aesthetic" peppered with "powerful riffs and classic metal". Apar concluded that the album "is a well-produced, solid effort – but seeing as they're now trying to take over American hearts, it would be nice to see future attempts to distinguish themselves more from the new-school pack."Sputnikmusic also gave the album a 3 out of 5 with the explanation that it is "fun to listen to, and the guitar work sure is nice. The vocals are good as well, as main singer has a good voice, melodic and screamed, well supported by the screaming of the bassist." Music Emissions said the album contained very catchy songs, with clean and fast guitar sounds, and "an undertone of pop" which fits with the drumming. Despite its positive points, the reviewer said that the album would not attract people from outside the metalcore subgenre.
Stylus Magazine gave the album a C− (below average) and said that The Poison album appeared to be made for provincial 15-year-olds to get violent with each other. The reviewer noted two songs that were indicative of the band's "A-game": "The Poison" and "Suffocating Under Words of Sorrow (What Can I Do)". Punknews.org wrote that the album was "drab", leaving the reviewer bored with the slow pace, and frustrated that the screaming loud passages were delivered without a sense of anger or attitude.