Indoco Remedies has received a warning letter from the United States Food and Drug Administration for its Goa plant. The US drug regulator had inspected the facility in Goa during August 31-September 4, 2016. Following this, the facility was handed down six observations in Form 483, which do not pertain to data integrity, Indoco Remedies disclosed to the stock exchanges. Shares of the company may react adversely to the development.