Authorities in Myanmar have seized roughly 21 million methamphetamine pills with a street value of around US$35.5 million (NZ$52.99 million) near the border with China, state-owned media say.
It is the country's second largest haul of the contraband.
Although better known for its opium production, Myanmar, a country with restive and porous borders, is a major producer and exporting hub of low-purity pills made primarily of caffeine and methamphetamine.
The pills, which deliver a cheap high, are taken both by recreational users and labourers toiling for long hours who need to stay awake.
The seizure was made in Kutkai township, in northern Shan State, on Saturday (local time), the Kyemon newspaper said, adding that Aung Aung, a truck driver, told police he had been paid to deliver the cargo of tablets to Mandalay, Myanmar's second-largest city.
Investigation showed the seized drugs belonged to a fugitive connected with another seizure of drugs in Mandalay on March 5.
The seizure was Myanmar's second largest drug bust, following a seizure with a street value of US$100 million (NZ$149 million) last year in the commercial capital of Yangon, said police Colonel Zaw Khin Aung on Monday.
Myanmar has become an exporting centre for the drug, and police believed the latest seizure was meant to be distributed outside the country, Zaw Khin Aung said.
"The final destination of these big hauls of stimulants is not the domestic market," he added.