{HEAD ~ A therapeutically effective dose} refers to {TAIL ~ that amount} of active ingredient, which ameliorates the symptoms or condition 
{ HEAD ~ A therapeutically effective dose } refers to { TAIL ~ that amount } of active ingredient , which ameliorates the symptoms or condition
HEAD 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