miscible solvents such as c1 c7 alkanols vegetable oils or mineral oils comprising from 0 5 to 5 non toxic water soluble polymers natural products such as alginates pectins tragacanth karaya gum xanthan gum carrageenin agar and acacia starch derivatives such as starch acetate and hydroxypropyl starch and also other synthetic products such as polyvinyl alcohol polyvinylpyrrolidone polyvinyl methyl ether polyethylene oxide preferably cross linked polyacrylic acid and mixtures of those products demulcents used with embodiments of the present invention include but are not limited to glycerin polyvinyl pyrrolidone polyethylene oxide polyethylene glycol propylene glycol and polyacrylic acid particularly preferred demulcents are propylene glycol and polyethylene glycol 400 suitable tonicity adjusting agents include but are not limited to mannitol sodium chloride glycerin and the like suitable buffering agents include but are not limited to phosphates acetates and the like and amino alcohols such as 2 amino 2 methyl 1 propanol amp suitable surfactants include but are not limited to ionic and nonionic surfactants though nonionic surfactants are preferred rlm 100 poe 20 cetylstearyl ethers such as procol u00ae cs20 and poloxamers such as pluronic u00ae f68 the compositions set forth herein may comprise one or more preservatives examples of such.