The Swedish company Hässle, a division of Astra AB, initially discovered developed felodipine; it was partnered with Merck & Co. in the US under a 1982 agreement between the companies.
The Swedish company Hässle, a division of Astra AB, discovered felodipine; it filed a patent application in 1979 claiming felodipine as an antihypertensive drug. Astra partnered this drug and others with Merck & Co. in the US under a 1982 agreement between the companies.