Mumbai, June 16 -- The regulatory change could affect companies with exposure to cough syrup and respiratory formulations.

Mankind Pharma fell 1.11%, Abbott India declined 1.07%, Cipla slipped 0.52%, Dr. Reddy's Laboratories shed 0.40%, Glenmark Pharmaceuticals lost 0.17%, while Sun Pharmaceutical Industries eased 0.08%.

The ministry has amended the Drugs Rules, 1945, withdrawing an exemption that previously allowed the sale of cough syrups in villages with a population of less than 1,000 without certain retail licensing requirements.

Under the revised rules, cough syrups can now be sold and dispensed only through licensed pharmacies, irrespective of village size. The amendment was notified through a gazette notification issued by the go...