US Food and Drug Administration:
What is an active moiety?
The part of a drug that makes the drug work the way it does.
The molecule or ion, excluding those appended portions of the molecule that cause the drug to be an ester, salt (including a salt with hydrogen or coordination bonds), or other noncovalent derivative (such as a complex, chelate, or clathrate) of the molecule, responsible for the physiological or pharmacological action of the drug substance. 21 CFR 314.108(a)
Many different drug products may be marketed with the same active moiety.
(http://www.fda.gov/ohrms/dockets/ac/99/slides/3506s2/tsld013...


Begović I, Rečnik za hemiju i hemijski inženjering:
moiety - deo, komponenta, polovina (npr. molekula); čestica


“GALENIKA - DIDERMAL® mast
…
Aktivna komponenta u preparatu, gentamicin je antibiotik širokog spectra…”
(http://www.galenika.co.yu/proizvod.asp?sifra=FGL0528)


“HEMOFARM - PRESS
…
Aktivna komponenta ovih preparata je Acemannan (beta 1,4 asetilisani acemannan), složeni uglejni hidrat izolovan iz aloe vere (Aloa barbadensis Miller) još 1982.godine u laboratoriji kompanije Carrington.”
(http://www.hemofarm.com/_Hemofarm/documents/hemopress/2000/h...


“STRONG NATURE GRIPEX
…
Aktivna komponenta u medu je pinocembrin snaznog antioksidativnog potencijala.”
(http://www.elephant.co.yu/html/proizvodi1.htm)