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Thanks and good luck. Grams is probably right, in fact; I certainly can't think of an alternative, though I've tried. And drugs (legal ones, I mean) can be very expensive. The cost price of IVIG, which comes up in another of your questions, is currently 48-60 dollars per gram, and others cost a lot more than that.
Well, I agree that grams is the obvious answer, but if this spreadsheet is giving sales in the thousands or possibly millions of euros (see the M.EUR question), it seems remarkable that they are measuring the medicines sold in grams. Even gold only costs about 33 euros a gram at current prices. I really wonder if grams can be right.