- Ibandronate
- Ibrutinib
- Ibrutinib
- Ibuprofen
- Ibuprofen
- Ibutilide
- Icatibant
- Icotinib
- Idarubicin
- Idelalisib
- Ifosfamide
- Iguratimod
- Ilaprazole
- Iloperidone
- Iloprost
- Imatinib
- Imeglimin
- Imidacloprid
- Imidapril
- Imidocarb
- Imidocarb Dipropionate
- Iminostilbene
- Imipenem
- Imipramine
- Imiquimod
- Indacaterol
- Indapamide
- Indigo Carmine
- Indinavir
- Indocyanine Green
- Indomethacin
- Indoramin
- Infigratinib
- Iobitridol
- Iodixanol
- Iohexol
- Iopromide
- Ioversol
- Ipragliflozin
- Ipratropium
- Irbesartan
- Irganox
- Irinotecan
- Isavuconazole
- Isavuconazonium
- Iscotrizinol
- Isoconazole
- Isoflurane
- Isomaltitol
- Isomethadone
- Isometheptane
- Isometheptene
- Isoniazid
- Isoniazide
- Isoprenaline
- Isoproterenol
- Isopulegol
- Isosorbide Mononitrate
- Isosulfan Blue
- Isothipendyl
- Isotretinoin
- Isoxsuprine
- Isradipine
- Istradefylline
- Itopride
- Itraconazole
- Ivabradine
- Ivacaftor
- Ivermectin
- Ivosidenib
- Ixabepilone
- Ixazomib
- Izuforant
