Substance used as an antacid and laxative (8)

I believe the answer is:

magnesia

(Other definitions for magnesia that I've seen before include "Medicinal powder" , "Is Ma easing off the white mineral?" , "Asian gem (anag) - milk of ___" , "laxative" , "Carbonate used as an antacid" .)

I've seen this clue in The Guardian.

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