So what is trimetazidine, and how did Kamila Valieva get it?

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The Court of Arbitration for Sport ruled Monday that Kamila Valieva could compete in the short programme of the women's single skating competition.

International anti-doping officials met Sunday to discuss Valieva, a 15-year-old Russian figure skater who tested positive for trimetazidine before the Beijing Olympics.

The World Anti-Doping Agency considers the heart disease medication a performance-enhancing drug and has banned it.

Anti-Doping Agency

CNN reported

CAS upheld the Russian Anti-Doping Agency's decision to lift Valieva's provisional suspension on Monday, CNN reported. The court cited “exceptional circumstances” in its ruling Monday.

What is trimetazidine?

Trimetazidine is used to treat angina. The drug dilates blood vessels, allowing the heart to work more efficiently for longer.

When is trimetazidine prescribed?

Adults with angina can take trimetazidine. But it's not approved in the US. Beta blockers are more effective and have fewer side effects even where they are approved.

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Why would a teenager need trimetazidine?

“A 15-year-old girl shouldn't be on it,” Thacker said. “For the small percentage of kids who do get coronary heart disease, this is not a first-line medication because of the side effects.”

Potential side effects include nausea, vomiting, and gastrointestinal discomfort. Parkinson’s disease-like neurological side effects, such as tremors, have also been reported.

When is trimetazidine prescribed?

When is trimetazidine prescribed?