| Iodohippurate sodium I-123 | 56254-07-0 | Other substances | 0 |
| Iodohippurate sodium I-131 | 881-17-4 | Other substances | 0 |
| Iodohippuric acid | 147-58-0 | Contrast Media | 0 |
| Iodopropynyl butylcarbamate | 55406-53-6 | | 0 |
| Iodoxamic acid | 31127-82-9 | Contrast Media | 0 |
| Iofetamine I-123 | 75917-92-9 | Antihypertensive agents | 0 |
| Ioflupane I-123 | 155798-07-5 | Other substances | 0 |
| Iofolastat I-123 | 949575-24-0 | Other substances | 0 |
| Ioforminol | 1095110-48-7 | Diagnostic agents | 0 |
| Ioglicic acid | 49755-67-1 | Other substances | 0 |
| Ioglycamic acid | 2618-25-9 | Contrast Media | 0 |
| Iomazenil | 127985-21-1 | | 0 |
| Iomeprol | 78649-41-9 | Contrast Media | 0 |
| Iopanoic acid | 96-83-3 | Diagnostic agents | 0 |
| Iopentol | 89797-00-2 | Contrast Media | 0 |
| Iophendylate | 99-79-6 | | 0 |
| Iopodic acid | 5587-89-3 | | 0 |
| Iopydol | 5579-92-0 | Contrast Media | 0 |
| Iotrolan | 79770-24-4 | Contrast Media | 0 |
| Iotroxic acid | 51022-74-3 | Contrast Media | 0 |
| Ioxaglic acid | 59017-64-0 | | 0 |
| Ioxilan | 107793-72-6 | | 0 |
| Ioxitalamic acid | 28179-44-4 | Contrast Media | 0 |
| Ipafricept | 1391727-24-4 | Other substances | 0 |
| Ipamorelin | 170851-70-4 | Other substances | 0 |
| Ipatasertib | 1001264-89-6 | Enzyme Replacements/modifiers | 0 |
| Ipecac | 8012-96-2 | Antidotes, Deterrents, and Toxicologic Agents | 0 |
| Ipidacrine | 62732-44-9 | Central Nervous System Agents | 0 |
| Iprazochrome | 7248-21-7 | Analgesics | 0 |
| Iprindole | 5560-72-5 | Antidepressants | 0 |
| Iproclozide | 3544-35-2 | | 0 |
| Iproniazid | 54-92-2 | | 0 |
| Iptacopan | 1644670-37-0 | | 0 |
| Iratumumab | 640735-09-7 | Other substances | 0 |
| Irdabisant | 1005402-19-6 | | 0 |
| Irofulven | 158440-71-2 | Antineoplastics | 0 |
| Iron (III) oxide adipate | 764-65-8 | | 0 |
| Iron 2 sulfate | 7782-63-0 | | 0 |
| Iron polymaltose | 53858-86-9 | | 0 |
| iota-Carrageenan | 9062-07-1 | | 0 |