| NSI-189 | | | 1 |
| NSI-189 phosphate | 179324-69-7 | | 1 |
| Naphazoline Nitrate | 5144-52-5 | | 1 |
| Natrium Thioglycolacide | 367-51-1 | Detoxifiers in oncolytics | 1 |
| Natural Creosote | 8021-39-4 | Disinfectants | 1 |
| Nedaplatin | 95734-82-0 | Antineoplastics | 1 |
| Nedocromil | 69049-73-6 | Anti-allergy agents | 1 |
| Nefazodone | 83366-66-9 | Selective Serotonin Reuptake Inhibitors (SSRIs) | 1 |
| Nefopam Hydrochloride | 636-54-4 | Non-opioid analgesics | 1 |
| Neostigmine Methylsulfate | 51-60-5 | | 1 |
| Neratinib | 698387-09-6 | | 1 |
| Nervonic Acid | 506-37-6 | | 1 |
| Nettle | | Herbal remedies | 1 |
| Nicarbazin | 330-95-0 | Anti-infective Agents | 1 |
| Nicardipine hydrochloride | 54527-84-3 | | 1 |
| Nimustine Hydrochloride | 55661-38-6 | | 1 |
| Nirogacestat | 1290543-63-3 | Enzyme Replacements/modifiers | 1 |
| Nisin | 1414-45-5 | | 1 |
| Nitrocefin | 41906-86-9 | Antibacterials | 1 |
| Nitroprusside dihydrate, sodium | 13755-38-9 | | 1 |
| Nonivamide | 2319-84-8 | | 1 |
| Noradrenaline Bitartrate | 923288-95-3 | | 1 |
| Noradrenaline Bitartrate Monohydrate | 108341-18-0 | | 1 |
| Noradrenaline hydrochloride | | Adrenergic agents | 1 |
| Noroxycodone | 57664-96-7 | Opioid analgesics | 1 |
| Noroxycodone hydrochloride | 52446-25-0 | Opioid analgesics | 1 |
| Nusinersen | 1258984-36-9 | Cardiac stimulants | 1 |
| Nutmeg flower powder | | Herbal remedies | 1 |
| Nutmeg tree seed | | Herbal remedies | 1 |
| Oak bark | | Herbal remedies | 1 |
| Oclacitinib maleate | 1208319-27-0 | | 1 |
| Octisalate | | | 1 |
| Octocrylene | | | 1 |
| Oflea-wort seed | | Herbal remedies | 1 |
| Olaparib intermediates | 218301-22-5 | | 1 |
| Olive tree leaf cut | | Herbal remedies | 1 |
| Olopatadine Hydrochloride | 140462-76-6 | | 1 |
| Omadacycline | 389139-89-3 | Tetracyclines | 1 |
| Omalizumab | 242138-07-4 | Immunosuppressants | 1 |
| Omega-3 Acid Ethyl Ester 90 | 99685-96-8 | Other therapeutic nutrients/minerals/electrolyte | 1 |