| Antimigraine Preparations | Not Available | 27 | 240 | Details |
| Antimitotic Agents | Agents that arrest cells in MITOSIS, most notably TUBULIN MODULATORS. | 25 | 142 | Details |
| Antimony Compounds | Not Available | 2 | 1 | Details |
| Antimuscarinics Antispasmodics | Not Available | 11 | 88 | Details |
| Antimutagenic Agents | Agents that reduce the frequency or rate of spontaneous or induced mutations independen... more | 4 | 18 | Details |
| Antimycobacterials | Not Available | 29 | 232 | Details |
| Antimycotic Agents | Not Available | 0 | 0 | Details |
| Antimycotics for Systemic Use | Not Available | 14 | 119 | 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 | 32 | 125 | Details |
| Antineoplastic Agents | Substances that inhibit or prevent the proliferation of NEOPLASMS. | 786 | 3961 | Details |
| Antineoplastic Agents, Alkylating | A class of drugs that differs from other alkylating agents used clinically in that they... more | 41 | 125 | Details |
| Antineoplastic Agents, Hormonal | Antineoplastic agents that are used to treat hormone-sensitive tumors. Hormone-sensitiv... more | 34 | 255 | Details |
| Antineoplastic Agents, Immunological | Monoclonal antibodies that inhibit or prevent the proliferation of NEOPLASMS. | 76 | 154 | Details |
| Antineoplastic Agents, Phytogenic | Agents obtained from higher plants that have demonstrable cytostatic or antineoplastic ... more | 35 | 138 | Details |
| Antineoplastic and Immunomodulating Agents | Not Available | 514 | 3216 | Details |
| Antineoplastic antibiotics, daunorubicin derivatives | Not Available | 0 | 0 | Details |
| Antineoplastic cell and gene therapy | Not Available | 13 | 10 | Details |
| Antineoplastics, camptothecine derivatives | Not Available | 0 | 0 | Details |
| Antineoplastics, methanesulfonate derivatives | Not Available | 0 | 0 | Details |
| Antineoplastics, rebeccamycin derivatives | Not Available | 0 | 0 | Details |
| Antineoplastics, sulindac metabolites | Not Available | 0 | 0 | Details |
| Antineoplastics, thiotepa derivatives | Not Available | 0 | 0 | Details |
| Antineoplastics, uracil derivatives | Not Available | 0 | 0 | Details |
| Antineoplastics, uridine derivatives | Not Available | 0 | 0 | Details |