| NMDA receptor antagonists, glycine recognition site | Not Available | 0 | 0 | Details |
| Noble Gases | Elements that constitute group 18 (formerly the zero group) of the periodic table. They... more | 7 | 7 | Details |
| Non COX-2 selective NSAIDS | This category is only comprised of NSAIDS that non selectively inhibit COX and show no ... more | 82 | 524 | Details |
| Non Potassium Sparing Diuretics | A subclass of diuretics which does not limit the secretion of POTASSIUM into the URINE. | 8 | 58 | Details |
| Non-antibiotic erythromycin derivatives | Not Available | 0 | 0 | Details |
| Non-Competitive N-Methyl D-Aspartate (NMDA) Receptor Antagonists | Antagonists of NMDA receptors which exert their antagonism via binding to allosteric si... more | 1 | 9 | Details |
| Non-Fibrillar Collagens | A family of structurally-related short-chain collagens that do not form large fibril bu... more | 2 | 7 | Details |
| Non-narcotic Antitussive | Not Available | 1 | 2 | Details |
| Non-Nucleoside Analog | Not Available | 0 | 0 | Details |
| Non-Nucleoside Reverse Transcriptase Inhibitors | Not Available | 9 | 91 | Details |
| Non-Nutritive Sweeteners | Chemical additives, such as aspartame, saccharin, and sucralose, that give a sweet tast... more | 1 | 4 | Details |
| Non-peptidic antihypertensives | Not Available | 0 | 0 | Details |
| Non-peptidic gonadotropin releasing hormone receptor antagonists | Not Available | 0 | 0 | Details |
| Non-peptidic growth hormone secretagogues | Not Available | 0 | 0 | Details |
| Non-prednisolone derived steroids | Not Available | 0 | 0 | Details |
| Non-Replicating Recombinant, Self-Complementary Adeno-Associated Virus Serotype 9 Containing the Human CLN3 Gene | Not Available | 1 | 0 | Details |
| Non-selective Alfa-adrenergic Blocking Agents | Not Available | 1 | 5 | Details |
| Non-selective Beta-adrenergic Agonists | Not Available | 3 | 13 | Details |
| Non-Selective Calcium Channel Blockers | Not Available | 4 | 26 | Details |
| Non-Selective Monoamine Reuptake Inhibitors | Not Available | 21 | 298 | Details |
| Non-Standardized Animal Dander Allergenic Extract | Not Available | 4 | 0 | Details |
| Non-Standardized Animal Hair Allergenic Extract | Not Available | 7 | 0 | Details |
| Non-Standardized Animal Skin Allergenic Extract | Not Available | 11 | 0 | Details |
| Non-Standardized Bacterial Allergenic Extract | Not Available | 1 | 0 | Details |
| Non-Standardized Chemical Allergen | Not Available | 1 | 19 | Details |