Dean Ashfield, registered as a player for Clevedon RFC, has been banned from all sport for four years following an in-competition test on 15 March 2017.
He is banned from 10 April 2017, the date of his provisional suspension, until 9 April 2021.
Mr Ashfield tested positive for three substances: Drostanolone, Trenbolone and Clenbuterol. All three anabolic agents are non-specified substances included on the 2017 World Anti-Doping Agency Prohibited List.
Mr Ashfield was charged with a breach of World Rugby regulation 21.2.1, “Presence of a Prohibited Substance or its Metabolites or Markers in an Athlete’s Sample”. He admitted the charge and was handed a four-year ban by the National Anti-Doping Panel.