| Hypoxanthine | 68-94-0 | | 0 |
| Hypromellose Acetate Succinate | | | 0 |
| Ianalumab | 1929549-92-7 | Other substances | 0 |
| Ibacitabine | 611-53-0 | Anti-infective Agents | 0 |
| Ibalizumab | 680188-33-4 | Anti-infective Agents | 0 |
| Iberdomide | 1323403-33-3 | Other substances | 0 |
| Ibezapolstat | 1275582-97-2 | Dental and Oral Agents | 0 |
| Ibipinabant | 464213-10-3 | Anti-diabetics | 0 |
| Iboctadekin | 479198-61-3 | | 0 |
| Ibodutant | 522664-63-7 | Other substances | 0 |
| Ibopamine | 66195-31-1 | Central Nervous System Agents | 0 |
| Ibrexafungerp | 1207753-03-4 | Enzyme Replacements/modifiers | 0 |
| Ibritumomab tiuxetan | 206181-63-7 | | 0 |
| Ibuprofen piconol | 64622-45-3 | | 0 |
| Ibuproxam | 53648-05-8 | | 0 |
| Ibutamoren | 159634-47-6 | | 0 |
| Icapamespib | 1000999-96-1 | | 0 |
| Icaritin | 118525-40-9 | Anticancer drugs | 0 |
| Icerguastat | 951441-04-6 | | 0 |
| Iclaprim | 192314-93-5 | Anti-infective Agents | 0 |
| Icodextrin | 337376-15-5 | | 0 |
| Icosabutate | 1253909-57-7 | | 0 |
| Icrucumab | 1024603-92-6 | Other substances | 0 |
| Idalopirdine | 467459-31-0 | Central Nervous System Agents | 0 |
| Idanpramine | 25466-44-8 | Other substances | 0 |
| Idarucizumab | 1362509-93-0 | | 0 |
| Idasanutlin | 1229705-06-9 | Other substances | 0 |
| Idazoxan | 79944-58-4 | Antihypertensive agents | 0 |
| Idraparinux | 162610-17-5 | Anticoagulants | 0 |
| Idrevloride | 1416973-63-1 | | 0 |
| Idrocilamide | 6961-46-2 | Skeletal muscle relaxants | 0 |
| Idroxioleic acid | 56472-29-8 | | 0 |
| Idursulfase | 50936-59-9 | | 0 |
| Idursulfase beta | 1271734-34-9 | Gastrointestinal Agents | 0 |
| Ieramilimab | 2137049-37-5 | Other substances | 0 |
| Ifebemtinib | 1227948-82-4 | | 0 |
| Iferanserin | 58754-46-4 | Other substances | 0 |
| Ifetroban | 143443-90-7 | Dermatological Agents | 0 |
| Ifezuntirgene inilparvovec | 2407582-19-6 | | 0 |
| α-methylthiofentanyl | 103963-66-2 | | 0 |