| Anticholinergic Agents | Drugs that bind to but do not activate CHOLINERGIC RECEPTORS, thereby blocking the acti... more | 171 | 1463 | Details |
| Anticoagulants | Agents that prevent clotting. | 94 | 287 | Details |
| Anticoagulants, hirudin type | Not Available | 0 | 0 | Details |
| Anticonvulsants | Drugs used to prevent SEIZURES or reduce their severity. | 91 | 704 | Details |
| Anticorticosteroids | Not Available | 4 | 69 | Details |
| Antidepressants, dibenzo[a,d]cycloheptane derivatives | Not Available | 0 | 0 | Details |
| Antidepressants, imipramine derivatives | Not Available | 0 | 0 | Details |
| Antidepressive Agents | Mood-stimulating drugs used primarily in the treatment of affective disorders and relat... more | 272 | 2174 | Details |
| Antidepressive Agents Indicated for Depression | Included in this category are antidepressant agents that have been assigned indications... more | 36 | 597 | Details |
| Antidepressive Agents, Second-Generation | A structurally and mechanistically diverse group of drugs that are not tricyclics or mo... more | 18 | 232 | Details |
| Antidepressive Agents, Tetracyclic | Substances that contain a fused four-ring moiety and are used in the treatment of depre... more | 8 | 84 | Details |
| Antidepressive Agents, Triazolopyridine | Not Available | 2 | 31 | Details |
| Antidepressive Agents, Tricyclic | Substances that contain a fused three-ring moiety and are used in the treatment of depr... more | 23 | 252 | Details |
| Antidiarrheal microorganisms | Not Available | 1 | 0 | Details |
| Antidiarrheals | Miscellaneous agents found useful in the symptomatic treatment of diarrhea. They have n... more | 15 | 40 | Details |
| Antidiarrheals, Intestinal Antiinflammatory/antiinfective Agents | Not Available | 45 | 203 | Details |
| Antidiuretic Agents | Agents that reduce the excretion of URINE, most notably the octapeptide VASOPRESSINS. | 3 | 14 | Details |
| Antidiuretic Hormone Receptor Antagonists | Endogenous compounds and drugs that inhibit or block the activity of ANTIDUIRETIC HORMO... more | 5 | 8 | Details |
| Antidote for Acetaminophen Overdose | Not Available | 1 | 15 | Details |
| Antidotes | Agents counteracting or neutralizing the action of POISONS. | 48 | 311 | Details |
| Antiemetic Serotonin 5-HT3 Receptor Antagonists | A class of antiemetic medications used to prevent nausea and vomiting among patients un... more | 5 | 28 | Details |
| Antiemetics | Drugs used to prevent NAUSEA or VOMITING. | 44 | 291 | Details |
| Antiemetics and Antinauseants | Not Available | 14 | 75 | Details |
| Antiemetics Antagonists | Not Available | 0 | 0 | Details |
| Antifibrillant agents with local anaesthetic activity | Not Available | 0 | 0 | Details |