| Antisense Oligonucleotides | Short fragments of DNA or RNA that are used to alter the function of target RNAs or DNA... more | 19 | 36 | Details |
| Antiseptics and Disinfectants | Not Available | 46 | 191 | Details |
| Antisickling Agents | Agents used to prevent or reverse the pathological events leading to sickling of erythr... more | 4 | 16 | Details |
| Antispermatogenic Agents | Agents, either mechanical or chemical, which destroy spermatozoa in the male genitalia ... more | 5 | 13 | Details |
| Antithrombin III | Not Available | 1 | 1 | Details |
| Antithrombin III, agonists | Not Available | 1 | 1 | Details |
| Antithrombin Proteins | An endogenous family of proteins belonging to the serpin superfamily that neutralizes t... more | 5 | 5 | Details |
| Antithrombin-directed RNA Interaction | Not Available | 1 | 1 | Details |
| Antithrombins | Endogenous factors and drugs that directly inhibit the action of THROMBIN, usually by b... more | 20 | 56 | Details |
| Antithrombotic Agents, Misc. | Not Available | 1 | 1 | Details |
| Antithrombotics, heparinoid derivatives | Not Available | 0 | 0 | Details |
| Antithyroid agents | Agents used to treat hyperthyroidism. Typically antagonize the actions of thyroid hormo... more | 9 | 31 | Details |
| Antitoxins | Antisera from immunized animals that is purified and used as a passive immunizing agent... more | 0 | 0 | Details |
| Antitrematodals | Not Available | 8 | 27 | Details |
| Antitrichomonal Agents | Agents used to treat trichomonas infections. | 5 | 10 | Details |
| Antitussive Agents | Agents that suppress cough. They act centrally on the medullary cough center. EXPECTORA... more | 29 | 109 | Details |
| Antivaricose Therapy | Not Available | 9 | 35 | Details |
| Antivenins | Not Available | 8 | 3 | Details |
| Antivertigo Preparations | Not Available | 5 | 39 | Details |
| Antiviral Agents | Agents used in the prophylaxis or therapy of VIRUS DISEASES. Some of the ways they may ... more | 234 | 1102 | Details |
| Antiviral monoclonal antibodies | Not Available | 11 | 22 | Details |
| Antiviral receptors | Not Available | 0 | 0 | Details |
| Antivirals for Systemic Use | Not Available | 102 | 815 | Details |
| Antivirals for treatment of HCV infections | Not Available | 23 | 186 | Details |
| Antivirals used in combination for the treatment of HIV infections | Not Available | 21 | 273 | Details |