| N-Acetylalanine | 97-69-8 | Amino acids | 1 |
| N-Acetylmethionine | 65-82-7 | Amino acids | 1 |
| N-Benzyl Tertiary Butyl Amine | 3378-72-1 | Intermediates | 1 |
| N-Desmethyl Levofloxacin | 38677-85-9 | Quinolones | 1 |
| N-Methyl-1-((1R,4R)-4-(methyl(7-tosyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)amino)cyclohexyl)methanesulfonamide | NA | Intermediates | 1 |
| N-Methylurea | 598-50-5 | Alkylating agents | 1 |
| N-ethyl-5-fluoro-2-hydroxy-N-isopropyl benzamide | 1549490-65-4 | Intermediates | 1 |
| N-oxide Levofloxacin | 1025687-58-4 | Quinolones | 1 |
| NSI-189 | | | 1 |
| NSI-189 phosphate | 179324-69-7 | | 1 |
| Nafamostat | 81525-10-2 | Analgesics | 1 |
| Naftidrofuryl | 31329-57-4 | Central Nervous System Agents | 1 |
| Naftopidil | 57149-07-2 | Antihypertensive agents | 1 |
| Nalmefene | 55096-26-9 | | 1 |
| Naloxone 3-methylether | 131830-09-6 | Opioid antagonists | 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 |
| Nervonic Acid | 506-37-6 | | 1 |
| Nettle | | Herbal remedies | 1 |
| Nicarbazin | 330-95-0 | Anti-infective Agents | 1 |
| Nicardipine hydrochloride | 54527-84-3 | | 1 |
| Nicotinamide riboside | 1341-23-7 | | 1 |
| Nilotinib hydrochloride anhydrous | 923288-95-3 | Protein kinase inhibitors | 1 |
| Nimustine Hydrochloride | 55661-38-6 | | 1 |
| Nirmatrelvir | 188037-54-3 | Antivirals | 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 |
| Nutmeg flower powder | | Herbal remedies | 1 |
| Nutmeg tree seed | | Herbal remedies | 1 |
| Oak bark | | Herbal remedies | 1 |