Two athletes have avoided sanctions after a trace amount of meldonium was found in their systems, the International Paralympic Committee announced on Wednesday.
Ukrainian powerlifter Mariana Shevchuk and Russian track and field athlete Vladimir Andryushchenko both tested positive earlier this year.
But neither will serve suspensions as the IPC deferred to guidance from the World Anti-doping Agency on the excretion rates of the cardiac drug.
Shevchuk returned an adverse analytical finding for meldonium in a urine sample provided on 16 February, 2016, after she had competed at the IPC Powerlifting World Cup in Dubai, while Andryushchenko's adverse analytical finding followed an out-of-competition test on 5 March, 2016.
Meldonium was added to WADA's prohibited list on 1 January, with numerous positive tests across sport, including for tennis player Maria Sharapova.
WADA in April gave a potential lifeline to athletes who have tested positive for meldonium after admitting it is not clear how long it takes to leave the body.
And the IPC has determined both Shevchuk and Andryushchenko ingested the drug prior to its addition to the prohibited list.
IPC medical and scientific director Peter van de Vliet said: "In both cases, the IPC anti-doping hearing body found the athletes to have no fault or negligence after having considered the circumstances of each case and the WADA notice published in April 2016 on meldonium cases.
"WADA's notice gives guidance to hearing panels to assess the degree of fault/negligence for the presence of meldonium in an athlete's sample when the panel is satisfied in both instances that the substance was ingested before January 1, 2016, the date it was added to the Prohibited List.
"The notice was issued in absence of clear scientific evidence on excretion times of meldonium."
Despite avoiding a penalty, Shevchuk's results - including a junior world record - have been erased.
Sharapova, the most high-profile figure involved in the meldonium row, was banned for two years by the International Tennis Federation earlier this month.
She vowed to appeal to the Court of Arbitration for Sport.
