The present invention relates to new salts of omeprazole and esomeprazole respectively, i.e. salts of 5-methoxy-2-[[(4-methoxy-3,5-dimethyl-2-pyridinyl)-methyl]sulfinyl]-1H-benzimidazole and the (S)-enantiomer thereof. More specifically, the present invention relates to adamantan ammonium salt of the compounds, formed by a reaction of omeprazole and esomeprazole respectively and adamantan amine. The present invention also relates to a process for preparing the compounds of the invention, a pharmaceutical preparation and a method for treatment of gastric related disorders by administering the compounds of the invention.