A device for delivering the beneficial agent at a controlled rate over a prolonged period of time 1, wherein the cationic surfactant is a member selected from {HEAD ~ the group} consisting of lauryldimethylbenzylammonium chloride, diisobutylphenoxyethoxyethyldimethyl benzylammonium chloride, alkyldimethylbenzylammonium chloride, laurylisoquinolinium bromide, cetylethyldimethylammonium chloride, stearyldimethylbenzylammonium chloride, and {TAIL ~ ethanolated alkyl guanidine complex} 
consisting of
A device for delivering the beneficial agent at a controlled rate over a prolonged period of time 1 , wherein the cationic surfactant is a member selected from { HEAD ~ the group } consisting of lauryldimethylbenzylammonium chloride , diisobutylphenoxyethoxyethyldimethyl benzylammonium chloride , alkyldimethylbenzylammonium chloride , laurylisoquinolinium bromide , cetylethyldimethylammonium chloride , stearyldimethylbenzylammonium chloride , and { TAIL ~ ethanolated alkyl guanidine complex }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL