- Ibandronate
- Ibandronate Sodium
- Ibandronic Acid
- Ibogaine
- Ibrutinib
- Ibudilast
- Ibufenac
- Ibuprofen
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- Icariin
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- Iclaprim
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- Idarubicin
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- Iditol
- Idobutal
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- Iguratimod
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- Iloperidone
- Iloprost
- Imatinib
- Imazapyr
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- Iminostilbene
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- Imiquimod
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- Indacaterol
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- Indapamide
- Indazole
- Indicine
- Indigo
- Indigo Carmine
- Indigopurpurin
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- Indinavir
- Indirubin
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- Indocyanine
- Indocyanine Green
- Indole
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- Indolyl
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- Irostadine
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- Isatin
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- Iscotrizinol
- Isepamicin
- Iso E Super
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- Isoorientin
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- Isopropamide Iodide
- Isopropyl Palmitate
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- Isradipine
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- Itaconic Acid
- Itopride
- Itraconazole
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- Ivacaftor
- Ivermectin
- Ivosidenib
- Ixabepilone
- Ixazomib
- Izuforant