| Antimalarial diaminopyrimidines | Not Available | 1 | 6 | Details |
| Antimalarial methanolquinolines | Not Available | 2 | 28 | Details |
| Antimalarials | Agents used in the treatment of malaria. They are usually classified on the basis of th... more | 31 | 374 | Details |
| Antimanic Agents | Agents that are used to treat bipolar disorders or mania associated with other affectiv... more | 6 | 70 | Details |
| Antimetabolite Immunosuppressant | Not Available | 2 | 33 | Details |
| Antimetabolites | Drugs that are chemically similar to naturally occurring metabolites, but differ enough... more | 59 | 368 | Details |
| Antimicrobial Cationic Peptides | Small cationic peptides that are an important component, in most species, of early inna... more | 4 | 4 | Details |
| Antimicrobial Peptides | Small peptides that play an important role in early innate and induced defenses against... more | 7 | 4 | Details |
| Antimicrobials, sulfonamides derivatives | Not Available | 0 | 0 | Details |
| Antimigraine Agents, Miscellaneous | Not Available | 3 | 58 | Details |
| Antimigraine Preparations | Not Available | 26 | 201 | Details |
| Antimitotic Agents | Agents that arrest cells in MITOSIS, most notably TUBULIN MODULATORS. | 23 | 131 | Details |
| Antimony Compounds | Not Available | 2 | 1 | Details |
| Antimuscarinics Antispasmodics | Not Available | 11 | 82 | Details |
| Antimutagenic Agents | Agents that reduce the frequency or rate of spontaneous or induced mutations independen... more | 4 | 3 | Details |
| Antimycobacterials | Not Available | 27 | 179 | Details |
| Antimycotic Agents | Not Available | 0 | 0 | Details |
| Antimycotics for Systemic Use | Not Available | 14 | 109 | Details |
| Antimycotics, pyridone derivatives | Not Available | 0 | 0 | Details |
| Antinematodal Agents | Substances used in the treatment or control of nematode infestations. They are used als... more | 26 | 81 | Details |
| Antineoplastic Agents | Substances that inhibit or prevent the proliferation of NEOPLASMS. | 675 | 2808 | Details |
| Antineoplastic Agents, Alkylating | A class of drugs that differs from other alkylating agents used clinically in that they... more | 38 | 93 | Details |
| Antineoplastic Agents, Hormonal | Antineoplastic agents that are used to treat hormone-sensitive tumors. Hormone-sensitiv... more | 29 | 212 | Details |
| Antineoplastic Agents, Immunological | Monoclonal antibodies that inhibit or prevent the proliferation of NEOPLASMS. | 60 | 103 | Details |
| Antineoplastic Agents, Phytogenic | Agents obtained from higher plants that have demonstrable cytostatic or antineoplastic ... more | 29 | 91 | Details |