Unbelievable

[SteveB]

Last person in tennis you would have suspected. Many more players have had rumours around them for years.

Meldonium is a drug that aids blood flow and is used to treat patients suffering from heart failure and cardiac issues.
It was found to help the performance of healthy athletes because it can increase endurance and aerobic capabilities. There was evidence that it was being used for that purpose so it was banned.
The excuse given is that she was taking it for legitimate medical purposes would suggest she has heart failure and/or cardiac issues. This is hard to believe given she is a professional athlete and is obviously so fit.

Major part of her defence will be to get a doctor who will say she has a specific medical condition justifying her taking the drug. That may be difficult.