- I -
- Imagent GI
- Imavist
- ImmuRAIT
- indium 111 (111In)
- indium-111 pentetreotide
- Indium-Oxine
- indocyanine green (ICG)
- Intropaste
- iobitridol
- iocetamic acid
- iodamide
- iodide
- iodine-123 MIBG
- iodine-131 MIBG
- iodipamide
- iodipamide meglumine
- iodixanol
- iodized oil
- iodohippurate sodium I-123
- iodohippurate sodium I-131
- iodopyracet
- Iodotope
- ioglunide
- iohexol
- Iomeron 150, 250, 300, 350
- iopamidol
- iopanoate
- iopanoic acid
- iophendylate
- iopromide
- iothalamate
- iothalamate meglumine
- iothalamate sodium
- iothalamic acid
- iotrolan
- iotroxamide
- ioversol
- ioxaglate
- ioxaglate meglumine
- ioxaglate sodium
- ioxaglic acid
- ioxilan
- ioxithalamate
- ipodate
- ipodate sodium
- iridium
- iridium 192 (192Ir)
- Isopaque
- isosulfan blue
- Isovue
- Isovue Multipack-250, -300, -370
- Isovue-200, -250, -300, -370
- Isovue-M 200, 300
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