Amounts of medicine (5)
I believe the answer is:
doses
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amounts of medicine</span>' is the definition.<br/ ><span class="explanation-format__explanation">(a dose is a prescribed amount of medicine)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for doses that I've seen before include "Prescribed amounts of medicine" , "draughts" , "Measured amounts of medicine" , "Quanitites of medicine" , "Prescribed amounts of medication" .)