Sharon Bio-Medicine on Tuesday said the US health regulator had inspected and audited one of its formulations plants in Dehradun last week. The USFDA had inspected Sharon Bio's facility at Taloja near Navi Mumbai last month. Analysts will be keenly watching the observations of USFDA, as it had issued a warning letter to the firm last month for failing to pay generic drug user fee for three years since 2013. It would be barred from exporting to the US if the dues are not paid, the USFDA had warned.