He said the quantity of the medicines could be used to produce 7 million tablets of ya ba worth Bt1.4 billion. They were to be sent to the North for drug production, the minister alleged.
Police arrested Anat Pholyothee, 30, Watcharin Phumrat, 30, and Prasong Prasopchok, 60, who allegedly imported the tablets from Singapore.
The medicines contain pseudoephedrine, which is illegal for possession.
In related news, Army and police officials yesterday seized 2,000 bottles of cough medicine and arrested a man in Songkhla they alleged was transporting them to the southernmost province of Yala to produce drugs.
Suchart Un-ob, 35 was arrested while he drove a truck transporting the medicines to Yala. He was hired for Bt5,000 to transport the medicines, they said.