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