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