[On the Polymorphism of barbiturates in powders and tablets. Part 4: the dissolution of barbital B and barbital A (modifications I and III and their release from tablets (author's transl)].

Two commercial brands of barbital (A: German Democratic Republic, modification III; B: Hungarian Peopl's Republic, modification I) were used to study the solubility and dissolution of the modifications. Crystals of these two substances were brought into the shape of tablets, the physical parameters and textural properties of which were determined. The effect of polymorphism on the release of these substances is discussed in the light of the results obtained from this investigation. The discussion will be continued and summarized in a subsequent paper, including further modifications.