Police seized 14,400 bottles of cough syrup, which were packed in 90 cartons, from a truck at Sitaguri on NH31D near here on Sunday.
The illegal consignment was seized by Ambari-Falakata outpost of the Siliguri Metropolitan Police, along with the Special Task Force in Siliguri.
The police arrested Jagadish Singh, the owner-cum driver of the truck. He is from Fatehgarh Sahib district of Punjab.
The police said Singh had procured the contraband syrup from Uttar Pradesh and was on the way to Assam. The seizure and the arrest were made on the basis of a tip-off.
Charges under Narcotics Drugs and Psychotropic Substances Act have been brought against him, the police said.