Diphenhydramine tannate liquid and semi-solid compositions and methods of use

Abstract

Pharmaceutical compositions consisting of diphenhydramine tannate which are effective when administered for the symptomatic relief of sneezing, itchy, watery eyes, itchy nose or throat and runny nose due to hay fever (allergic rhinitis) or other respiratory allergies are disclosed.

1 . A therapeutic composition for symptomatic treatment of respiratory allergies in a warm-blooded animal, said composition comprising a pharmaceutically effective amount of diphenhydramine tannate of consistent purity in substantial absence of an organic solvent.  
     
     
         2 . The composition of  claim 1 , wherein said organic solvent is an alcohol.  
     
     
         3 . The composition of  claim 1 , wherein said organic solvent is a mineral oil.  
     
     
         4 . The composition of  claim 1 , wherein said organic solvent is isopropyl alcohol.  
     
     
         5 . The composition of  claim 1 , wherein said organic solvent is glycerin.  
     
     
         6 . The composition of  claim 1 , wherein said organic solvent is propylene glycol.  
     
     
         7 . The composition of  claim 1 , wherein said organic solvent is ethanol.  
     
     
         8 . The composition of  claim 1 , further including at least one additional active ingredient selected from a group consisting of antihistamines, sympathomimetics, decongestants, cough suppressants, antitussives and expectorants.  
     
     
         9 . A therapeutic composition for symptomatic treatment of respiratory allergies in a warm-blooded animal, said composition comprising a pharmaceutically effective amount of diphenhydramine tannate of consistent purity in substantial absence of decomposition products of diphenhydramine produced at temperatures above about 50 degrees C.  
     
     
         10 . The composition of  claim 9  wherein said decomposition product is benzhydrol.  
     
     
         11 . The composition of  claim 9  wherein said decomposition product is benzophenone.  
     
     
         12 . The composition of  claim 9  wherein said decomposition product is diphenylchloromethane.  
     
     
         13 . The composition of  claim 9  wherein said decomposition product is dimethylaminoethanol.  
     
     
         14 . The composition of  claim 9  wherein said decomposition product is diphenylmethane.  
     
     
         15 . The composition of  claim 9  wherein said decomposition product is diphenyl alkyl ether.  
     
     
         16 . The composition of  claim 9 , further including at least one additional active ingredient selected from a group consisting of antihistamines, sympathomimetics, decongestants, cough suppressants, antitussives and expectorants.  
     
     
         17 . A therapeutic composition for symptomatic treatment of respiratory allergies in a warm-blooded animal, comprising a pharmaceutically effective amount of diphenhydramine tannate of consistent purity prepared in a preferred way by: 
 (a) dissolving the salt or free base of the diphenhydramine in a pharmaceutically acceptable liquid to form a solution at a maximum temperature and pH value, that does not cause decomposition of the active pharmaceutical ingredient;    (b) separately adding a dispersing agent and tannic acid to a pharmaceutically acceptable liquid, under stirring, to form a dispersion;    (c) transferring the solution from step (a), in portions to the dispersion in step (b) under stirring, to form a precipitate of a tannate salt of diphenhydramine; and    (d) combining the tannate salt of the diphenhydramine without isolation or purification with pharmaceutically acceptable excipients to generate a therapeutic dosage form.    
     
     
         18 . The composition of  claim 17 , further including at least one additional active ingredient selected from a group consisting of antihistamines, sympathomimetics, decongestants, cough suppressants, antitussives and expectorants.  
     
     
         19 . A method for symptomatically treating respiratory allergies in a warm-blooded animal, comprising administering to said warm-blooded animal a pharmaceutically effective amount of diphenhydramine tannate of consistent purity in substantial absence of an organic solvent.  
     
     
         20 . A method for symptomatically treating respiratory allergies in a warm-blooded animal, comprising administering to said warm-blooded animal a pharmaceutically effective amount of diphenhydramine tannate of consistent purity in substantial absence of decomposition products of diphenhydramine produced at temperatures above about 50 degrees C.  
     
     
         21 . A method for symptomatically treating respiratory allergies in a warm-blooded animal, comprising administering to said warm-blooded animal a pharmaceutically effective amount of diphenhydramine tannate of consistent purity prepared in a preferred way by: 
 (a) dissolving the salt or free base of the diphenhydramine in a pharmaceutically acceptable liquid to form a solution at a maximum temperature and pH value, that does not cause decomposition of the active pharmaceutical ingredient;    (b) separately adding a dispersing agent and tannic acid to a pharmaceutically acceptable liquid, under stirring, to form a dispersion;    (c) transferring the solution from step (a), in portions to the dispersion in step (b) under stirring, to form a precipitate of a tannate salt of diphenhydramine; and    (d) combining the tannate salt of the diphenhydramine without isolation or purification with pharmaceutically acceptable excipients to generate a therapeutic dosage form.    
     
     
         22 . The composition of  claim 1  in substantial absence of any other active ingredient.  
     
     
         23 . The composition of  claim 1  in substantial absence of any other tannate salt.  
     
     
         24 . The composition of  claim 9  in substantial absence of any other active ingredient.  
     
     
         25 . The composition of  claim 9  in substantial absence of any other tannate salt.  
     
     
         26 . The composition of  claim 17  in substantial absence of any other active ingredient.  
     
     
         27 . The composition of  claim 17  in substantial absence of any other tannate salt.