The Olympic silver medallist Ben Proud has become the first Briton to join the Enhanced Games, an event that allows athletes to take ­performance-enhancing drugs.

The 30-year-old, who came second in the 50m freestyle in Paris last summer, does not believe the event undermines clean sport. “I think [the Enhanced Games] opens up the potential avenue to excel in a very different way,” he told BBC Sport.

“Realistically, I’ve achieved ­everything I can and now the Enhanced is giving me a new opportunity. I definitely don’t think that’s undermining a clean sport. I really respect the sport I’ve been part of and I would never step back in knowing I’ve done something which isn’t in the rules.”

Proud said he had found ­competitors committing doping ­violations in his sport “incredibly frustrating”. The Enhanced Games permits athletes to take substances approved by the US Food and Drug Administration, under strict supervision.

“I will never take anything that I am unsure of,” Proud said. “They are not allowing anyone to participate if they are under any stress or health risks.”

A UK Sport spokesperson said: “UK Sport condemns everything the Enhanced Games stands for in the strongest possible terms. We believe it risks compromising athlete health and welfare, undermines the trust of fans and is the absolute antithesis to our philosophy of winning well.

“We are incredibly disappointed to learn that any British athlete in one of our Olympic or Paralympic programmes would support such an event. We are engaging with our colleagues at Aquatics GB as a matter of urgency to determine Ben Proud’s suitability to receive public funds.

“It is clear, however, that any breach of anti-doping rules is contrary to the policies any athlete must comply with to receive UK Sport funding.”

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A statement from Aquatics GB said the governing body was “immensely disappointed in Ben Proud’s announcement to sign with the Enhanced Games”, adding: “Aquatics GB, along with our partners, stand firmly behind the values and principles of clean sport and condemns Ben’s decision in the strongest terms.”

The inaugural Enhanced Games are scheduled for May in Las Vegas.