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| A unit used to measure the activity of many vitamins, hormones, enzymes, and drugs. An IU is the amount of a substance that has a certain biological effect. For each substance there is an international agreement on the biological effect that is expected for 1 IU. Also called International Unit. |
Previous Definitions: | isotretinoin, ispinesib, isthmus, ITP, itraconazole | Next Definitions: | IUD, IV, IVP, ixabepilone, Ixempra |
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