| 5-Androstanon (3) Derivatives | Not Available | 2 | 12 | Details |
| 5-HT1B receptor antagonists | Not Available | 0 | 0 | Details |
| 6-Phytase | Not Available | 0 | 0 | Details |
| ABO Blood-Group System | Not Available | 1 | 0 | Details |
| Abortifacient Agents | Chemical substances that interrupt pregnancy after implantation. | 15 | 96 | Details |
| Abortifacient Agents, Nonsteroidal | Non-steroidal chemical compounds with abortifacient activity. | 10 | 70 | Details |
| Abortifacient Agents, Steroidal | Steroidal compounds with abortifacient activity. | 2 | 17 | Details |
| Abuse-Deterrent Formulations | Drug formulations or delivery systems intended to discourage the abuse of CONTROLLED SU... more | 1 | 4 | Details |
| Acanthaceae | A plant genus of the family ACANTHACEAE. Delta 6 Hexadecenoic acid (16:1 delta 6) compo... more | 1 | 5 | Details |
| Acaricides | Not Available | 1 | 1 | Details |
| ACE Inhibitors and Calcium Channel Blockers | Not Available | 14 | 151 | Details |
| ACE Inhibitors and Diuretics | Not Available | 13 | 57 | Details |
| Acetal derivatives | Not Available | 0 | 0 | Details |
| Acetaldehyde | A colorless, flammable liquid used in the manufacture of acetic acid, perfumes, and fla... more | 1 | 1 | Details |
| Acetals | Not Available | 1 | 1 | Details |
| Acetamides | Derivatives of acetamide that are used as solvents, as mild irritants, and in organic s... more | 28 | 88 | Details |
| Acetaminophen and Prodrugs | Not Available | 2 | 45 | Details |
| Acetanilides | Compounds based on N-phenylacetamide, that are similar in structure to 2-PHENYLACETAMID... more | 11 | 44 | Details |
| Acetates | Derivatives of ACETIC ACID. Included under this heading are a broad variety of acid for... more | 94 | 387 | Details |
| Acetic Acid Derivatives and Related Substances | Not Available | 17 | 124 | Details |
| Acetonitriles | Compounds in which a methyl group is attached to the cyano moiety. | 1 | 6 | Details |
| Acetophenones | Derivatives of the simplest aromatic ketone acetophenone (of general formula C6H5C(O)CH3). | 1 | 1 | Details |
| Acetyl Aldehyde Dehydrogenase Inhibitors | Not Available | 1 | 7 | Details |
| Acetylcholine Release Inhibitors | Compounds that block release of the neurotransmitter ACETYLCHOLINE. | 5 | 9 | Details |
| Acetylcholine Releasing Agent | Not Available | 1 | 16 | Details |