What is trimetazidine, the drug Russian skater Kamila Valieva tested positive for before the Olympics?

Trimetazidine is a medication used to improve blood supply to the heart among people with the coronary heart disease angina

The drug causes the blood vessels to dilate, allowing the heart to work more efficiently for a longer duration of time, said Deepika Thacker

Trimetazidine may be used to treat adults with angina, a type of chronic chest pain. 

The drug is not approved for use in the United States, but is used in some European countries

Even in countries where it is approved for use, trimetazidine is not typically a first-choice medication 

common medications, such as beta blockers are more effective with fewer 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 heart disease does occur among children, it is most often a structural problem present at birth, Thacker said

problems often treated by a combination of medication, lifestyle change, and possibly surgery