Sportspeople will die on the field as a result of being denied meldonium, according to the heart drug's inventor.
On Monday, Maria Sharapova announced she had tested positive for meldonium.
Meldonium, also known as mildronate, was developed to treat diabetes and various heart-related diseases.
Latvian Ivars Calvins told BBC Radio 5 live: "We will see many deaths on the field. Athletes who use mildronate will not be able to do it in the future and will be not more protected."
Listen to the full interview with the inventor of meldonium
He added: "This drug was on the market for 32 years - as a self-protective agent - and now suddenly it becomes forbidden.