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. 2023 Dec 19;38(1):555. doi: 10.4102/sajid.v38i1.555

TABLE 3.

Colistimethate sodium conversion table adopted from electronic medicines compendium.

≈ mass of CMS (mg) Potency
IU ≈ mg CBA
1 12 500 0.4
12 150 000 5
80 1 000 000 34
360 4 500 000 150
720 9 000 000 300

Source: From Pharmaceuticals B. Colistimethate sodium 1 million IU powder for solution for injection [homepage on the Internet]. 2018, pp. 1–10. [cited 2023 Jan 26]. Available from: https://wwwmedicinesorguk/emc/product/5648 18

CBA, colistin base activity; CMS, colistimethate sodium; IU, international unit.

, Nominal potency of the drug substance = 12 500 IU/mg.