Anti-narcotics police confiscated over 10.9 million pills weighing almost two tonnes in two separate raids in the Hatay region on the border with Syria this week, the official Anatolia news agency and Hurriyet daily quoted the interior ministry as saying.
Captagon, based on the amphetamine phenethylline (also spelt Fenethylline), a synthetic stimulant, is a hugely popular drug in the Middle East and produced in Syria.
Large quantities of the drug are also illegally smuggled abroad, with Saudi Arabia a major market where the authorities repeatedly report seizures.
The reports said that 7.3 captagon pills were seized in one raid and were set to be shipped to Gulf countries by sea hidden in 1,300 oil filters.
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Another 3.6 million pills were seized in a depot, the reports added.
One Syrian citizen and two Turkish nationals have been detained on suspicion of trying to organise the smuggling, the reports said.
Lebanese authorities this month charged a Saudi prince and nine others with drug trafficking, after nearly two tonnes of captagon capsules and cocaine were found waiting to be loaded onto their private plane at Beirut airport.