Measured amount of medicine taken at any one time (6)

I believe the answer is:

dosage

(Other definitions for dosage that I've seen before include "amount of 14 [WONDER DRUG], say" , "Quantity of medication" , "Giving of medicine in prescribed amount" , "The giving of medication in prescribed amount" , "Provision of medicine in prescribed amounts" .)

I've seen this clue in The Guardian.

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