The 'crazy pill' that fueled Thailand's long-haul drivers and militias

Countries & Cities · Published 9 October 2026 Swipe more like this →

In short: Small, round, and often flavored like candy, ya ba is a potent mixture of methamphetamine and caffeine. From its origins as a legal stimulant for truckers to its role in modern illicit trafficking, this drug has shaped the clandestine economies of Southeast Asia and beyond.

Ya ba's history in Thailand is marked by shifting legality and nomenclature. Originally sold legally at fuel stations, it was used by long-haul drivers to maintain alertness before being outlawed in 1970. Its names reflect its perceived effects: 'ya khayan' (hard-working pill), 'ya maa' (horse medicine), and finally 'ya ba' (crazy pill) in 1996. In the United States, it is sometimes referred to as 'Nazi speed.' The drug's production is deeply tied to regional conflict.

Myanmar remains the world's largest producer of methamphetamine, with much of the ya ba entering Thailand from the Golden Triangle and northeastern Shan State. Production is largely driven by ethnic militias—specifically the United Wa State Army—though Burmese military units are also implicated in trafficking. In 2010 alone, Myanmar reportedly trafficked 1 billion tablets into neighboring Thailand.

Consumption patterns vary significantly based on method. When swallowed as a pill (roughly 6mm in diameter), the effects last 8–16 hours with reduced intensity. However, 'chasing the dragon'—heating the tablet on foil to inhale vapors—shortens the duration to just 1–3 hours but increases potency. This leads to a grueling comedown period of 6–10 hours where users struggle to sleep or eat, often remaining awake for up to 24 hours after use. The drug's reach is global. While common among working males aged 16–40 in Southeast Asia, it has appeared in the Israeli club scene and Asian communities in California. In Bangladesh, the government even drafted a law in 2018 imposing capital punishment for carrying more than 200 grams of the substance.

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