Antil originally won a gold medal at the 2000 World Junior Championships, but she lost it due to a positive drugs' test for pseudoephedrine. As per the rules in force at that time for such an offence, her National Federation issued her a public warning after stripping her of the medal.[4] She won a bronze medal at the next World Junior Championships in 2002.
She won a silver medal at the 2006 Commonwealth Games, and was honoured with Bhim Award by the Haryana state government on 26 June 2006. Her absence from the 2006 Asian Games attracted considerable media attention.[5] She had tested positive for a steroid (stanozolol) prior to the Games but was cleared to participate by her National Federation. She, however, opted out of the team for the Games.[6]