of compounds of this invention by reacting a carboxylic acid containing moiety with a suitable base such as the hydroxide carbonate or bicarbonate of a pharmaceutically acceptable metal cation or with ammonia or an organic primary secondary or tertiary amine pharmaceutically acceptable salts include but are not limited to cations based on alkali metals or alkaline earth metals such as lithium sodium potassium calcium magnesium and aluminum salts and the like and nontoxic quaternary ammonia and amine cations including ammonium tetramethylammonium tetraethylammonium methylammonium dimethylammonium trimethylammonium triethylammonium diethylammonium and ethylammonium among others other representative organic amines useful for the formation of base addition salts include ethylenediamine ethanolamine diethanolamine piperidine piperazine and the like dosage forms for topical administration of a compound of this invention include powders sprays ointments and inhalants the active compound is mixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives buffers or propellants which can be required opthalmic formulations eye ointments powders and solutions are also contemplated as being within the scope of this invention actual dosage levels of active ingredients in the pharmaceutical compositions of this invention can be varied so as to obtain an amount of the active compound s which is effective to achieve the desired therapeutic response for a particular patient compositions and mode of administration the selected.