{HEAD ~ Metoclopramide} is {TAIL ~ a dopamine antagonist} with weak 5 HT3 antagonist activity, which becomes more prominent at higher doses 
is
{ HEAD ~ Metoclopramide } is { TAIL ~ a dopamine antagonist } with weak 5 HT3 antagonist activity , which becomes more prominent at higher doses
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH