Abstract: New stable oral pharmaceutical formulations are prepared by covering an inert nucleus with a first layer containing an acid labile benzimidazole compound, a water soluble polymer and non-alkaline reacting pharmaceutical acceptable excipients, a second isolation layer containing a water soluble polymer, pharmaceutical acceptable excipients and a final enteric coating.

Abstract: It is described the preparation of the famotidine polymorphs with low melting point and relative high or low apparent densities. They differ from the polymorph of high melting point and high density, in the physical-chemical and biological properties, of interest in galenic formulations and preparation of the drug.

Abstract: H.sub.2 -receptor antagonist ascorbate compounds, derived from the lactone form of 3-ketohexuronic acid of Formula ##STR1## where (X) may be 1, 2 or 3 and (Y) may be 1 or 2, R.sub.1 and R.sub.2 are both hydrogen or R.sub.1 may be hydroxyl, R.sub.2 hydrogen or the O-alkylidene, 5,6-diacyl, 6-acyl derivatives thereof having two to sixteen carbon atoms, or a 6-phosphate, R.sub.3 being an organic base or a salt thereof having one or more basic functional groups, having H.sub.2 -receptor antagonist properties and capable of reacting with nitrous acid, and a process for the preparation of said compounds.