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