Richard Kilty will not be able to send his son to school with an Olympic medal because his 4x 100m silver will be taken away.
Ujah tested positive for ostarine and S-23 but says he didn't know he had eaten a contaminated substance.
Kilty said that he felt sad all the way.
The medal is going to be stripped and wiped from history, and it is heartbreaking to finally hear the news, says the 32-year-old.
My happiness was to win an Olympic medal and give it to my son so he could say my dad won an Olympic medal. I don't have to do that. The motivation is for the next two and a half years to make sure that job gets done properly next time.
Kilty wants to overcome adversity and win a gold medal in the relay at Paris 2024.
In Tokyo, he was joined by Ujah, Zharnel Hughes and Nethaneel Mitchell-Blake as the British team finished one-hundredth of a second behind Italy to claim Olympic silver.
The Court of Arbitration of Sport (Cas) concluded that the four members of the team should lose their medal after Ujah was tested immediately after the event.
The news was announced along with an apology from Ujah, who blamed a contaminated supplement for the failed test and added the situation was one he will regret for the rest of his life.
British athletics insists athletes adhere to safe use of supplements and that Ujah's supplement was not certified for safe use by Informed Sport.
Kilty, who is currently overcoming an injury, said that we get that hammered home by British Athletics and UK Anti-Doping.
I have followed the rules for the last 21 years. Other team-mates have not followed the rules as strictly as the rest of us. We have been burned by that.
I am happy that the whole set-up has been apologized to. I am thankful for the apology but the rules are the same.
When you become a professional athlete, the main thing you sign up for is a one-hour curfew for the rest of your life to provide the address and time you will be available for testing. Everything that goes into your body is your responsibility. You have to be held accountable for that.
It never crossed my mind that one of our members failed a test in a million years.
Only CJ knows the truth. Either he took drugs or his supplements were contaminated. Either one is not following the rules. He has owned up to it. He is very regretful for not following the rules as strictly as he should have done.
For the third time at a summer or winter Games, Britain lost an Olympic medal because of the punishment given by Cas.
At the 1988 and 2002 Salt Lake Games, a skier and a gymnast lost their bronze medals after testing positive for banned substances.
The governing body of the sport could ban Ujah from competition if they make their own decisions.
S arms are substances found in his samples.
US Anti-Doping says Sarms have similar properties to steroids.
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