phosphate granulating and disintegrating agents for example corn starch or alginic acid binding agents for example starch gelatin or acacia and lubricating agents for example magnesium stearate stearic acid or talc the tablets may be uncoated or they may be coated by known techniques to delay disintegration and absorption in the gastointestinal tract and thereby provide a sustained action over a longer period for example a time delay material such as glyceryl monostearate or glyceryl distearate may be employed they may also be coated by the techniques described in the u s pat nos 4 256 108 4 166 452 and 4 265 874 to form osmotic therapeutic tablets for control release formulations for oral use may also be presented as hard gelatin capsules where in the active ingredient is mixed with an inert solid diluent for example calcium carbonate calcium phosphate or kaolin or as soft gelatin capsules wherein the active ingredient is mixed with water or an oil medium for example peanut oil liquid paraffin or olive oil aqueous suspensions contain the active materials in admixture with excipients suitable for the manufacture of aqueous suspensions such excipients are suspending agents for example sodium carboxymethylcellulose methylcellulose hydroxypropylmethylcellulose sodium alginate polyvinyl pyrrolidone gum tragacanth and gum acacia dispersing or wetting agents may be a naturally occurring phosphatide for example lecithin or condensation products of an alkylene oxide with fatty acids.