The firm is among three Indian companies whose cough syrups the World Health Organization (WHO) and other agencies have linked to the deaths of 141 children in Uzbekistan, Gambia and Cameroon, in one of the world's worst such waves of poisoning.
At least 70 children in Gambia, most under 5 years old, died from acute kidney injury last year. A government task force which investigated the deaths found they were "a direct result" of contaminated cough and cold syrups imported from India.
Health Minister Mansukh Mandaviya said investigations were continuing, and production was suspended at the Marion Biotech unit in Noida, outside Delhi, while a senior executive for the firm said they were awaiting reports following the inspection.
Indian health authorities halted production at Maiden's main factory in Sonepat near New Delhi in October after a WHO report said the company's cough and cold syrups might be connected to the deaths of 69 children in Gambia this year.
In the letter, Somani said the samples of four made-in-India cough syrups linked to the deaths of 66 children in Gambia which were tested in government laboratory here were found to be complying with specifications and not to have been contaminated with DEG or EG according to the test reports.