| Ingenol | Ingenol |
| Ingenol disoxate | 1383547-60-1 |
| Iniparib | 160003-66-7 |
| Inlezifigene civaparvovec | 2143578-31-6 |
| Inobrodib | 2222941-37-7 |
| Inodiftagene vixteplasmid | 2166100-08-7 |
| Inolimomab | 152981-31-2 |
| Inosine 5'-sulfate | 70023-32-4 |
| Inosinic Acid | 131-99-7 |
| Inositol 2,4,5-trisphosphate | 91840-07-2 |
| Inositol nicotinate | 6556-11-2 |
| Inotersen | 1492984-65-2 |
| Inotuzumab ozogamicin | 635715-01-4 |
| Insulin Detemir | 169148-63-4 |
| Insulin Glulisine | 207748-29-6 |
| Insulin argine | 68859-20-1 |
| Insulin icodec | 1188379-43-2 |
| Insulin peglispro | 1200440-65-8 |
| Insulin tregopil | 874442-57-6 |
| Intepirdine | 607742-69-8 |
| Interferon Alfa-2a, Recombinant | 76543-88-9 |
| Interferon Alfa-2b, Recombinant | 98530-12-2 |
| Interferon alfa-n1 | 74899-72-2 |
| Interferon alfa-n3 | |
| Interferon alfacon-1 | 118390-30-0 |
| Interferon beta-1a | 145258-61-3 |
| Interferon beta-1b | 145155-23-3 |
| Interferon gamma-1b | 98059-61-1 |
| Interleukin-7 | 858376-81-5 |
| Intermedine | 581-05-5 |
| Intetumumab | 725735-28-4 |
| Intoplicine | 125974-72-3 |
| Inulin | 9005-80-5 |
| Invert sugar | 8013-17-0 |
| Iobenguane | 80663-95-2 |
| Iobenzamic acid | 3115-05-7 |
| Iobitridol | 136949-58-1 |
| Iocarmic acid | 10397-75-8 |
| Iocetamic acid | 16034-77-8 |
| Iodamide | 440-58-4 |