Boxer Eric Molina has been handed a two-year ban from all sport after testing positive for dexamethasone following his fight with Anthony Joshua in December 2016.
The American took an in-competition test after a third-round knockout defeat to Joshua, with positive results for the prohibited substance.
UK Anti-Doping backdates sanction
Molina had already been handed a provisional suspension in October, and UK Anti-Doping (UKAD) has now confirmed that he will be banned for two years, with the sanction backdated to the start of that temporary sentence.
UKAD chief Nicole Sapstead said: "Every athlete is solely responsible for what is in their system and must adhere to the strict liability principle.
BAN | American boxer Eric Molina has been suspended from all sport for a period of two years following an Anti-Doping Rule Violation (ADRV).— UK Anti-Doping (@ukantidoping) May 22, 2018
Full judgement https://t.co/wKaUz6GU0A pic.twitter.com/mP4lJU3sgB
"All athletes at any level should familiarise themselves with the WADA Prohibited List and ensure they do not put themselves in a position where they may breach anti-doping regulations."
Molina had accepted the charge late last year but hoped to challenge the two-year ban.
The 36-year-old had been set to face Mariusz Wach this week, having fought twice since the Joshua bout.