In one embodiment, the method can additionally include forming a barrier layer on at lease a selected portion of the reservoir region for reducing the rate at which {HEAD ~ the active ingredient} is released from {TAIL ~ the reservoir region} 
is released from
In one embodiment , the method can additionally include forming a barrier layer on at lease a selected portion of the reservoir region for reducing the rate at which { HEAD ~ the active ingredient } is released from { TAIL ~ the reservoir region }
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 HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL