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