MUMBAI: Sales of drugs in India, including anti-infective, respiratory and gastro medicines, fell for the fourth month in a row as the Covid-19 epidemic and lockdowns kept patients from visiting doctors for minor ailments and other treatments, data from the All India Origin Chemists and Druggists Association showed.Since April, sales of anti-infective drugs have dropped by an average of 15% and the declining trend continued in July, with a fall