| Narcotic agonists/antagonists, normorphine derivatives | Not Available | 0 | 0 | Details |
| Narcotics | Agents that induce NARCOSIS. Narcotics include agents that cause somnolence or induced ... more | 51 | 282 | Details |
| Narrow Therapeutic Index Drugs | Narrow therapeutic index (NTI) drugs are defined as those drugs where small differences... more | 253 | 2462 | Details |
| Nasal Decongestants | Drugs designed to treat inflammation of the nasal passages, generally the result of an ... more | 9 | 69 | Details |
| Nasal Decongestants for Systemic Use | Not Available | 3 | 35 | Details |
| Nasal Preparations | Not Available | 46 | 352 | Details |
| Natriuresis | Not Available | 1 | 0 | Details |
| Natriuresis, drug effects | Not Available | 1 | 0 | Details |
| Natriuretic Agents | Endogenous or exogenous chemicals that regulate the WATER-ELECTROLYTE BALANCE in the bo... more | 59 | 254 | Details |
| Natriuretic Peptide, Brain | Not Available | 2 | 4 | Details |
| Natriuretic Peptides | Peptides that regulate the WATER-ELECTROLYTE BALANCE in the body, also known as natriur... more | 6 | 9 | Details |
| Natural and Semisynthetic Estrogens, Plain | Not Available | 7 | 116 | Details |
| Natural antibiotics | Not Available | 0 | 0 | Details |
| Natural Opium Alkaloids | Not Available | 10 | 71 | Details |
| Natural Penicillins | Not Available | 2 | 27 | Details |
| Nebramycin | A complex of antibiotic substances produced by Streptomyces tenebrarius. | 1 | 4 | Details |
| Nectin-4-directed Antibodies | Monoclonal antibodies directed towards nectin-4. | 1 | 3 | Details |
| Negative Inotrope | Any compounds or agents that weaken the force of muscle contraction, but most commonly ... more | 18 | 262 | Details |
| Neisseria meningitidis | Not Available | 1 | 0 | Details |
| Neonatal Fc Receptor Blocker | Not Available | 3 | 3 | Details |
| Neoplasm Proteins | Proteins whose abnormal expression (gain or loss) are associated with the development, ... more | 10 | 12 | Details |
| Nephrotoxic agents | This category includes all drugs with the potential to generate kidney damage and to re... more | 163 | 1121 | Details |
| Neprilysin Inhibitor | Not Available | 2 | 4 | Details |
| Neprilysin Inhibitors | Not Available | 1 | 1 | Details |
| Neprilysin, antagonists & inhibitors | Not Available | 6 | 10 | Details |