Abstract: This invention relates to a bioactive composition comprising: (d) pH sensitive bioactive agent (e) an edible carboxylic acid containing moiety and (f) an edible alkalising moiety, wherein the proportion of said moieties and active agent provide pH control such that (i) when 400 mg of said composition is added to 20 ml of 0.033 normal hydrochloric acid and at a temperature of 37+/?3° C., the pH reaches a value in the range 4 to 8, and (ii) when 400 mg of said composition is added to 20 ml of deionised water at pH 7 and at a temperature of 37+/?3° C., the pH reaches a value less than 8.5.

Abstract: A pharmaceutical composition consisting, of nontoxic components wherein the nontoxic components comprise a core element comprising an antibody which binds to an antigen wherein the core element is a compressed tablet wherein compression forces used to prepare the tablet range from about 0.1 tonnes/cm.sup.2 to about 42.1 tonnes/cm.sup.2 and the process for preparing the composition.