Atorvastatin, the substance known by the chemical name [R-(R*,R*)]-2-(4-fluorophenyl)-,
dihydroxy-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrole-1-heptanoic
acid hemi calcium salt, is readily available in one of its crystalline forms as
it is known from the prior art. The present invention relates to a novel process
for preparing atorvastatin in an amorphous form by precipitating the atorvastatin
using a solvent of a second type from a solution of atorvastatin which is provided
with a solvent of a first type. This process is useful for the conversion of atorvastatin
in a crystalline form into atorvastatin in an amorphous form.
